Airbus A350 vs Boeing 787 Dreamliner: Which Is Better?

Quick Answer

The Airbus A350 vs Boeing 787 Dreamliner comparison is remarkably close: both aircraft feature composite structures, modern cabin environments, electronically dimmable windows and cabin-pressure systems designed for long-haul comfort. The A350 has a slightly wider cabin cross-section, while the 787 offers particularly large windows and a well-publicized focus on cabin humidity. Neither is universally more comfortable, because the airline's seats, cabin layout and onboard amenities can make a greater difference than the aircraft itself.

Introduction

Choosing between the Airbus A350 and Boeing 787 Dreamliner can influence how comfortable you feel on a long-haul flight, particularly when the journey lasts 10 hours or longer. Cabin pressure, air quality, window design, noise and seating space all matter when you're spending an extended period in the air.

Both aircraft belong to a generation of widebody jets developed with passenger comfort and operating efficiency in mind. Their composite structures allow design approaches that would be more difficult with traditional metal airframes, while their modern environmental-control systems support lower cabin altitudes and improved onboard conditions.

However, the aircraft type is only part of the decision. A well-designed Premium Economy seat on one airline can provide a more comfortable journey than a cramped Economy seat on another, even when the aircraft itself has excellent environmental specifications. Business Class layouts, seat recline, entertainment systems and individual seat locations introduce further differences.

The most useful comparison, therefore, considers both the underlying aircraft and the real-world experience offered by airlines operating them.

Here's a closer look at how they compare.

Video: Airbus A350 vs Boeing 787 Dreamliner

This video focuses on one important element of the comparison: the cabin-pressure systems that help shape the long-haul flying experience.

Key Takeaways

1. Cabin pressure: Both aircraft target a cabin altitude around or below 6,000 feet, considerably lower than the conventional 8,000-foot cabin altitude associated with many older airliners.
2. Seat comfort: The A350 has a wider published cabin cross-section, but individual seat width depends on the airline's configuration.
3. Humidity: Boeing highlights the 787's ability to maintain higher cabin humidity, while Airbus also emphasizes humidity and temperature management on the A350.
4. Windows: The 787 is known for exceptionally large electronically dimmable windows. The A350 also features electronic window dimming.
5. Noise: Both are designed to reduce cabin noise. Available comparative measurements suggest a relatively small difference rather than a decisive winner.
6. Range: The A350-900 and 787-9 are both capable long-haul aircraft, while specialized A350 variants can support particularly demanding ultra-long-haul routes.
7. Airline matters most: Seat layout, Premium Economy availability, Business Class design and onboard service can outweigh the differences between the two aircraft.

Definitions: Terms You Should Know

Seat pitch: The distance between corresponding points on two seats in successive rows. It is commonly used as a measure of legroom, although it does not directly equal the amount of usable knee space.

Seat width: The space between a seat's armrests. A wider seat can improve comfort, particularly when sitting for many hours.

Widebody aircraft: An aircraft with two passenger aisles. The A350 and 787 are both widebody jets, allowing airlines to arrange several seating groups across the cabin.

Premium Economy: A cabin class between Economy and Business Class, usually featuring a wider seat, greater recline, additional legroom and upgraded service.

Cabin altitude: The equivalent atmospheric altitude maintained by the aircraft's pressurization system. A lower cabin altitude generally means higher cabin air pressure and can reduce some effects associated with high-altitude exposure.

Cabin humidity: The amount of moisture in the cabin air. Low humidity can contribute to dry eyes, lips and skin during a long flight.

British Airways Club Suite: British Airways' Business Class product featuring fully flat beds, direct aisle access and privacy doors on equipped aircraft.

Lufthansa Allegris: Lufthansa's newer long-haul cabin product, with updated seating and multiple seat options across Economy, Premium Economy, Business Class and, on selected A350 aircraft, First Class.

Airbus A350 vs Boeing 787 Dreamliner: Key Design Differences

Airbus A350: A Wider Cabin and a Modern Long-Haul Interior

The Airbus A350 family includes the A350-900 and the longer A350-1000, with the A350-900ULR designed for especially long-range operations.

Its airframe uses advanced materials, including extensive carbon-fibre composites. Airbus identifies approximately 53% of the A350 airframe as composite material, alongside titanium and other advanced materials.

The A350 has a maximum published cabin width of approximately 5.71 metres. This provides designers with some additional room to work with when arranging seats, aisles and cabin furnishings.

In a typical nine-abreast Economy configuration, the layout is three seats beside the window, three in the middle and three beside the opposite window. However, airlines can change seating density and cabin divisions, so the wider airframe does not automatically guarantee a wider passenger seat.

The A350 also incorporates the Airspace cabin design, which includes electronic window dimming, configurable LED lighting and modern in-flight entertainment systems. Airbus emphasizes the alignment of passenger windows with window seats, although the precise arrangement still depends on the installed cabin.

Boeing 787 Dreamliner: Large Windows and an Efficient Composite Structure

The Boeing 787 family consists of the shorter 787-8, the longer-range 787-9 and the higher-capacity 787-10. Like the A350, it makes extensive use of carbon-fibre composite materials.

Boeing states that composites account for approximately 50% of the 787's structure by weight. The material contributes to the aircraft's efficiency and supports its pressurization and environmental-control design.

The Dreamliner is particularly recognizable for its large passenger windows. Boeing describes them as the largest windows fitted to a widebody aircraft, and they feature electronically controlled dimming instead of conventional mechanical shades.

Both aircraft use modern aerodynamics, advanced flight systems and carefully designed cabin interiors. The A350 has a somewhat wider published cabin cross-section, whereas the 787's large windows are a particularly distinctive passenger-facing feature.

Neither design alone settles the comfort question. The seat dimensions, row spacing and interior fittings installed by an airline ultimately determine how much of the aircraft's design advantages passengers experience.

Long-Haul Cabin Comfort: Pressure, Humidity and Air Quality

Cabin pressure is one of the more meaningful technical considerations when choosing an aircraft for an overnight journey.

At cruising altitude, the outside atmosphere is too thin to support normal breathing without a pressurized cabin. Aircraft therefore maintain an internal pressure equivalent to being at a much lower altitude.

The Boeing 787 is designed around a cabin altitude of approximately 6,000 feet. Airbus advertises an A350 cabin altitude below 6,000 feet. These are manufacturer specifications, not promises that every flight will maintain precisely the same value at every moment.

Compared with higher cabin altitudes, lower cabin altitude can reduce some of the physiological effects of altitude exposure. Nevertheless, it does not eliminate fatigue, dehydration or the effects of crossing time zones.

Humidity is less straightforward. Boeing highlights the 787's ability to maintain higher humidity levels than conventional jet designs. Composite construction helps make this possible. Airbus also promotes humidity and temperature management as features of the A350's cabin environment, but directly comparable, guaranteed humidity percentages are not readily available for both aircraft.

Neither manufacturer publishes a universal passenger comfort score that establishes an outright winner. Actual humidity and air quality depend on system operation, maintenance and environmental conditions.

Verdict: Both aircraft offer a modern pressurization environment. The 787 has a particularly prominent published focus on humidity, while the A350 also targets a low cabin altitude and controlled cabin environment. The available specifications do not establish that one will consistently leave passengers feeling better after every flight.

Noise and Sleep Quality

Cabin noise can affect concentration, conversation and sleep, particularly on overnight flights. Engine noise, airflow, vibration, seat location and the surrounding cabin all influence how loud an aircraft feels.

Both the A350 and 787 were designed with noise reduction in mind. The A350 uses Rolls-Royce Trent XWB engines, while the 787 is powered by either General Electric GEnx or Rolls-Royce Trent 1000 engines. Boeing also highlights acoustic treatments and engine-nacelle features intended to reduce noise.

A published real-flight study measured cabin noise across several widebody aircraft. Its reported average cruising measurements were approximately 74.9 dB(A) for the A350-900 and 72.7 dB(A) for the Boeing 787. That suggests the 787 was slightly quieter under the conditions measured.

The difference should not be treated as a universal result. The study covered a limited selection of flights, and measurements can change with aircraft configuration, engine type, measurement location and operating conditions.

For passengers, seat location matters as well. Sitting closer to the engines can produce a different experience from sitting farther forward, while a busy galley or a seat near lavatories can make rest more difficult on either aircraft.

Verdict: The 787 has some evidence in its favour for cabin quietness, but the difference is not large enough to guarantee a better night's sleep. A suitable seat, a comfortable sleeping surface and a quieter part of the cabin may matter more.

Seats and Seating Configurations by Cabin Class

Economy Class

Both aircraft commonly use a 3-3-3 Economy layout on long-haul services. This means nine seats across three seating groups, although other configurations exist.

The A350's wider cabin cross-section can give airlines more space to allocate to seats and aisles. Yet the advantage depends on the installed interior. A dense A350 layout can feel less comfortable than a more generously spaced 787 cabin.

Seat pitch, width, recline, padding, headrest adjustment and the shape of the seat in front all affect comfort. For a long journey, these practical details are usually more valuable than the aircraft name alone.

Premium Economy

Premium Economy is often one of the strongest ways to improve long-haul comfort without paying for Business Class.

Both aircraft can accommodate a separate Premium Economy cabin, but whether that cabin exists depends on the airline and its configuration. Where offered, seat layouts commonly use seven or eight seats across, rather than the nine usually found in Economy.

Japan Airlines illustrates the potential difference with its international A350-1000. Its published Premium Economy layout uses a 2-4-2 arrangement, with approximately 48 cm of seat width and 107 cm of pitch. Its Economy cabin uses a 3-3-3 configuration, with approximately 46 cm of seat width and 84–86 cm of pitch.

These are airline-specific figures, not standard dimensions for every A350. Premium Economy products on the 787 also vary, with individual airlines choosing different seat models and row spacing.

Business Class

In Business Class, the most important consideration is often the seat design rather than the aircraft type. Many modern long-haul configurations on both aircraft offer fully flat beds and a 1-2-1 arrangement, giving every passenger direct aisle access.

However, not every Business Class seat is identical. Some seats offer more privacy, greater storage, a longer bed or better positioning for sleeping. Older configurations can provide a less private experience.

British Airways offers a useful example: its Club Suite features a fully flat bed, privacy door and direct aisle access. The product is available on the A350 and equipped 787s, although its installation across the 787 fleet has not been universal. Checking the exact aircraft and seat map is therefore important.

First Class

Neither aircraft automatically comes with First Class. Airlines decide whether to install it, and some operate premium configurations that concentrate on Business Class instead.

Lufthansa Allegris, for example, offers First Class on selected A350 services, while its new product is also being introduced on selected 787-9 services with Economy, Premium Economy and Business Class.

For travellers booking the most expensive cabin, the individual seat, privacy, bedding and service should take precedence over a general A350-versus-787 ranking.

In-Flight Entertainment, Lighting, Windows and Amenities

Both aircraft support modern in-flight entertainment, power outlets, electronic lighting and connectivity equipment. The exact features available to a passenger depend on what the airline has installed.

The 787's large windows are a notable design advantage for passengers who enjoy looking outside. Its electronically dimmable windows allow cabin light to be reduced without completely blocking the view. This can be useful when the cabin is darkened for sleeping, although the crew may control window settings at certain times.

The A350 also has electronically dimmable windows and LED mood lighting. Airbus emphasizes a window layout designed to give window-seat passengers a window view, as well as configurable lighting intended to support different phases of the journey.

Neither aircraft guarantees modern Wi-Fi, a large entertainment screen or a particular selection of films. Some airline cabins have new entertainment equipment and charging ports, while others may use older systems. Connectivity speed and availability also depend on the airline's service and the route.

Amenities such as bedding, meal choices, amenity kits and service standards are airline products rather than inherent qualities of the aircraft.

Range, Flight Duration and Route Implications

The A350 and 787 are both intended for long-haul operations, but their variants differ in size, capacity and range.

Airbus lists maximum ranges of approximately 8,600 nautical miles for the A350-900 and 9,100 nautical miles for the A350-1000. The A350-900ULR, a specialized ultra-long-range version, is designed for missions of up to approximately 9,800 nautical miles.

Boeing lists up to 8,000 nautical miles for the 787-8, 8,300 for the 787-9 and 7,500 for the 787-10.

These manufacturer figures should not be interpreted as guaranteed distances on every commercial flight. Actual achievable range depends on payload, fuel reserves, weather, routing, winds, airport conditions and airline operating decisions.

The A350-1000 is longer than every 787 variant, while the 787-9 offers a useful combination of passenger capacity and long-haul reach. The A350-900ULR is designed for particularly demanding ultra-long-haul routes.

For passengers, range is most relevant when it determines whether a route is nonstop or requires a connection. The aircraft's technical range does not directly tell you how comfortable the journey will be, but a nonstop flight may avoid the disruption and extra time involved in changing planes.

Both families routinely operate long-haul routes, and their typical cruise speeds are broadly similar. The choice should therefore be based on the actual itinerary, travel time and cabin rather than range figures alone.

Which Airlines Fly the Airbus A350 and Boeing 787?

Many major airlines operate one or both aircraft families, but their interior products differ considerably.

British Airways operates the A350-1000 and several 787 variants. Its Club Suite offers direct aisle access and a fully flat bed on equipped aircraft. The airline also has World Traveller Plus Premium Economy and World Traveller Economy, but the precise cabin layout depends on the aircraft. Passengers should check whether their specific 787 has the desired Business Class product.

Lufthansa operates both the A350 and 787-9, with Allegris being introduced on selected routes from Munich and Frankfurt. The product includes Economy, Premium Economy and Business Class, with First Class on selected A350 services. The specific aircraft and route determine which version passengers receive.

Qatar Airways operates both the A350 and 787. Selected A350 configurations feature Qsuite Business Class, while the airline's 787-9 fleet includes a Business Class product with privacy doors. Not every A350 has Qsuite, and the airline's aircraft also differ in Economy seating density. A high-density A350-1000 configuration, for example, can have much tighter Economy seats than a more spacious configuration of the same aircraft family.

Singapore Airlines operates A350s and 787-10s. Its long-haul A350-900 configuration offers Business Class, Premium Economy and Economy, with a nine-abreast Economy layout. Its other aircraft and route configurations can differ, so the specific seat map remains important.

Japan Airlines offers another useful example. Its international A350-1000 combines a nine-abreast Economy cabin with a separate eight-abreast Premium Economy cabin. The airline's 787 products should be considered separately rather than assuming identical seating across the fleet.

Other major operators include Air Canada, United Airlines and American Airlines with 787 services, while Cathay Pacific, Air France and Virgin Atlantic are important A350 operators.

These examples show why comparing aircraft in isolation can be misleading. Two A350 flights can feel dramatically different depending on seat pitch, Economy density, Premium Economy availability and the Business Class design. The same is true of the 787.

Before booking, check the aircraft variant, cabin class, seat dimensions, row layout, entertainment equipment and the precise seat map for your flight. Aircraft substitutions and cabin retrofits can also change the experience.

Airbus A350 vs Boeing 787 Dreamliner: Comparison Table

Range and dimensions are manufacturer-published figures. Maximum range is not a direct prediction of achievable range on a particular flight, and the aircraft families' variants are not all equivalent in size or capacity.

Final Verdict — Which Aircraft Is Better for Long-Haul Comfort?

The Airbus A350 has a slight advantage if cabin width and the overall cabin environment are your priorities. Its wider published cabin cross-section gives airlines more flexibility in designing the interior, and its low cabin-altitude target is well suited to long-haul flying.

The Boeing 787 is an equally compelling choice, particularly for travellers who value large windows and the aircraft's approach to humidity management. Available comparative noise measurements also give the 787 a modest advantage in the flights studied, although that finding should not be generalized to every aircraft or seat.

Neither aircraft is a universal winner. A well-configured 787 with spacious Economy seating could be preferable to a high-density A350, while a modern A350 Business Class seat could be substantially better than an older 787 cabin.

For most passengers, the best decision-making order is:

1. Choose the cabin class that fits your budget and comfort priorities.
2. Compare the actual seat width, pitch, recline and sleeping arrangements.
3. Confirm the airline's precise aircraft variant and cabin configuration.
4. Consider the flight duration, route and seat location.
5. Use the aircraft type as a final point of comparison.

Overall winner: a narrow preference for the Airbus A350, but not by enough to ignore the airline. When two flights have similar prices, cabin classes and seat specifications, the A350 is a reasonable tie-breaker. If one flight offers a significantly better seat or cabin configuration, choose that flight regardless of which aircraft operates it.

FAQ

Is the Airbus A350 more comfortable than the Boeing 787?

Not consistently. The A350 has a wider published cabin cross-section, while the 787 has particularly large windows and emphasizes higher humidity. Seat configuration and airline service remain major factors.

Which aircraft is quieter on long-haul flights?

Both aircraft use modern noise-reduction designs. One published study measured slightly lower average cruising noise on the 787-9 than on the A350-900, but aircraft configuration, engine type and seat location affect the results.

Does the Boeing 787 have better cabin pressure and humidity?

Both have cabin-altitude targets around or below 6,000 feet. Boeing specifically highlights the 787's higher-humidity capability, but comparable guaranteed humidity percentages for normal airline operations are not available for both families.

Which aircraft has better Economy Class seating?

The A350's wider cabin cross-section can offer an advantage, but neither aircraft guarantees a particular seat width or pitch. Compare the airline's actual seat map, dimensions and seating density before deciding.

Which aircraft is better for sleeping on an overnight flight?

The best choice is the flight with the most suitable seat, quieter surroundings and a cabin layout that supports rest. In Economy, compare pitch and recline; in Business Class, check whether the seat becomes fully flat and provides direct aisle access.

Sources

Airbus, "A350," https://www.aircraft.airbus.com/en/aircraft/a350

Airbus, "A350-900," https://www.aircraft.airbus.com/en/aircraft/a350/a350-900

Airbus, "A350-1000," https://www.aircraft.airbus.com/en/aircraft/a350/a350-1000

Airbus, "Airbus A350 Family: the future of long-haul travel," https://www.airbus.com/en/products-services/commercial-aircraft/passenger-aircraft/a350-family

Boeing, "787 Dreamliner," https://www.boeing.com/commercial/787

Boeing, "787 Dreamliner by Design," https://www.boeing.com/commercial/787/by-design

Lee et al., "Assessment of in-cabin noise of wide-body aircrafts," https://pmc.ncbi.nlm.nih.gov/articles/PMC9074885/

British Airways, "British Airways Club Suite," https://mediacentre.britishairways.com/factsheet/details/202

British Airways, "Seat maps," https://www.britishairways.com/content/en/information/seating/seat-maps

Lufthansa Group, "Experience a new way of traveling – with Lufthansa Allegris," https://business.lufthansagroup.com/gb/en/allegris/corporates-start-of-booking

Qatar Airways, "All you need to know about our aircraft," https://www.qatarairways.com/en/fleet.html

Qatar Airways, "A350-1000 Technical Details," https://www.qatarairways.com/content/dam/documents/fleet/seatpmap-a350-1000-395-seater.pdf?pubDate=20260227

Singapore Airlines, "Airbus A350-900 Long-Haul Seat Map," https://www.singaporeair.com/saar5/pdf/OurFleet/A350-900-3classes-LongHaul.pdf

Japan Airlines, "JAL International Economy Class Seats (A350-1000)," https://www.jal.co.jp/jp/en/inter/service/economy/seat/A350-1000.html

Japan Airlines, "JAL International Premium Economy Class Seats (A350-1000)," https://www.jal.co.jp/jp/en/inter/service/premium/seat/A350-1000.html

ANA, "All Nippon Airways Introduces New Premium Economy and Economy Class Seats," https://www.anahd.co.jp/group/en/pr/pdf/20250409.pdf

Wikimedia Commons, "A350 First Flight - Low pass 03," https://commons.wikimedia.org/wiki/File:A350_First_Flight_-_Low_pass_03.jpg

The Points Guy, "Photo Tour: Inside Airbus' Second-Ever A350," https://thepointsguy.com/news/airbus-a350-photo-tour/

United Airlines Newsroom, "United - Newsroom - Photos," https://united.mediaroom.com/photos?cat=3244

The New Zealand Herald, "Flight Check: China Southern, Auckland to Guangzhou, China, on a B787 Dreamliner," https://www.nzherald.co.nz/travel/flight-check-china-southern-to-guangzhou-china-and-kathmandu-nepal-on-a-b787-dreamliner/OVUQAPIPJFDJNCBM7IE5DNKXQQ/

Cockpit King, "787 vs A350: The Cabin Pressure Battle That Redefined Long-Haul Comfort," https://www.youtube.com/watch?v=VmMJeYvJ7MI