Airbus A330-300 vs. Boeing 787-9: Which Is Better to Fly?

The Boeing 787-9 is the better aircraft on most counts: it is 20 years newer, flies about 2,300 km farther, and keeps the cabin at a lower altitude with more humidity, so most people step off it less tired. The Airbus A330-300 wins one thing that matters a lot in economy: seat width. Most A330-300s seat eight across in a 2-4-2 layout with seats around 18 inches wide, while most 787-9s seat nine across in 3-3-3 with seats around 17 inches wide.

So the short version is this. In business or premium economy, pick the 787-9. In economy on a flight over ten hours, the 787-9’s cabin air usually outweighs the narrower seat. In economy on a shorter flight, or if you are travelling as a couple and want a window pair with no stranger beside you, the A330-300 is often the more comfortable choice.

One caveat applies to everything below: the airline decides the seats, not Airbus or Boeing. A new cabin on an old A330 can beat a worn cabin on a 787. Always check the seat map for your exact flight.

 

How do the A330-300 and 787-9 compare side by side?

The two aircraft are almost the same size on the outside. The differences are in range, cabin width and the age of the design.

	Airbus A330-300	Boeing 787-9
Entered service	1994	2014
Production status	Ended (replaced by the A330-900neo)	In production
Length	63.66 m	62.8 m
Wingspan	60.3 m	60.1 m
Cabin width	5.28 m	5.49 m
Typical seats	250 to 290	About 290 in two classes
Maximum range	11,750 km (6,350 nm)	14,010 km (7,565 nm)
Usual economy layout	2-4-2 (8 across)	3-3-3 (9 across)
Usual economy seat width	About 18 in	About 17 to 17.3 in
Cabin altitude at cruise	About 8,000 ft	About 6,000 ft
Fuselage	Aluminium	Carbon-fibre composite
Windows	Standard, pull-down shades	Much larger, electronic dimming
Engines	GE CF6, Pratt & Whitney PW4000 or Rolls-Royce Trent 700	GE GEnx or Rolls-Royce Trent 1000

 

 

Which aircraft is more comfortable on a long flight?

The 787-9 has the better cabin environment, and the gap grows with every hour in the air. Four things cause it.

Cabin pressure. The 787’s composite fuselage lets Boeing pressurise the cabin to the equivalent of about 6,000 feet. The A330-300, like most aluminium aircraft, sits closer to 8,000 feet. Lower cabin altitude means more oxygen in your blood, which is why many passengers report fewer headaches and less fatigue after a 787 flight.

Humidity. Composite does not corrode the way aluminium does, so the 787 can hold more moisture in the cabin air. Your eyes, skin and throat dry out more slowly. On the A330-300 the air is as dry as on any older long-haul jet.

Windows. The 787 has the largest windows of any current airliner, and they dim electronically with a button. You can see the horizon from an aisle seat. The trade-off is that the crew can dim every window centrally, and the darkest setting still lets some light through, which bothers some people trying to sleep. The A330-300 has ordinary windows with a pull-down shade that blocks light completely.

Noise. The 787’s engines have serrated edges on the nacelles that cut noise inside and outside the cabin. The A330-300 is not a loud aircraft, and seats ahead of the wing are quiet, but the 787 is quieter overall.

The honest limit of all this: on a six-hour daytime flight you will barely notice the difference. On a 13-hour overnight flight you probably will.

 

Which has better seats, the A330-300 or the 787-9?

In economy the A330-300 usually has the wider seat, and this is the 787-9’s biggest weakness.

The A330-300 cabin is 5.28 m wide. That fits eight seats across in a 2-4-2 layout, with seats about 18 inches wide. Delta, for example, lists 18 inches in the main cabin of its A330-300.

The 787-9 cabin is 5.49 m wide, only 21 cm more. Boeing designed it for eight across, but almost every airline fits nine across in 3-3-3. The result is a seat about 17 to 17.3 inches wide. United lists 17.3 inches on its 787-9, and British Airways 17 inches.

An inch sounds small. Across your shoulders for ten hours it is the difference between touching your neighbour and not.

The layout matters as well:

• Couples do better on the A330-300. The window pairs in 2-4-2 mean two people sit together with no third seat.
• Solo travellers who want an aisle have more aisle seats to choose from per row on the A330-300 (four of eight) than on the 787-9 (four of nine).
• Middle seats are fewer on the A330-300: two per row against three on the 787-9.

There are exceptions in both directions. Japan Airlines fits its 787-9 economy cabin with 2-4-2 seating, which makes it one of the best economy cabins flying. Some low-cost airlines, including AirAsia X and Cebu Pacific, squeeze 3-3-3 into the narrower A330, which is worse than any 787.

In business class the airframe matters much less than the airline. Many 787-9s have newer cabins with direct aisle access from every seat, simply because the aircraft are younger. Older A330-300s sometimes still have 2-2-2 business seats where the window passenger climbs over a neighbour. Check the seat map before you pay for either.

 

Which flies farther, and where will you find each one?

The 787-9 flies about 2,260 km farther: 14,010 km against 11,750 km for the A330-300. That gap decides which routes each aircraft gets.

The A330-300 is a medium-to-long-haul aircraft. Airlines use it on flights of roughly 5 to 11 hours: across the North Atlantic, between Europe and the Middle East or South Asia, within Asia, and on busy regional routes where they need 280 or more seats. Airbus itself describes it as covering most of the routes a 787-9 flies, at lower cost.

The 787-9 is a true long-haul aircraft. It flies the routes the A330-300 cannot reach, such as the Qantas nonstop between Perth and London, which takes about 17 hours. It also flies plenty of 8-to-12-hour routes where an airline wants one aircraft type for everything.

For you as a passenger this means two things. On very long routes you will not have a choice, because only the 787-9 (or a larger aircraft) can do them. On medium routes such as Europe to the US East Coast, or the Gulf to Europe, you may find both types on the same city pair, sometimes on the same airline at different times of day. That is when the comparison in this article is worth a minute of your time.

 

Is the newer 787-9 safer or more advanced than the A330-300?

The 787-9 is more advanced. Neither aircraft is meaningfully safer than the other for a passenger choosing a flight.

Technology. The A330-300 entered service in 1994 with an aluminium fuselage and engines designed in the 1980s and 1990s. The 787-9 entered service in 2014 with a carbon-fibre composite fuselage, more electrical systems in place of pneumatic ones, and a newer generation of engines. The 787-9 burns about 20% less fuel than the older aircraft it replaces. Airbus stopped building the A330-300 and now sells the re-engined A330-900neo in its place.

Age. The youngest A330-300s are already several years old and the oldest are more than 25. The 787-9 fleet ranges from new to about 12 years old. Age does not make an aircraft unsafe, since maintenance rules are the same for both, but it does affect what you see: older A330-300s are more likely to have dated screens, no USB-C power and worn seats, unless the airline has refitted them.

Safety record. Both have strong records. The A330 family has flown for more than 30 years and had 14 hull losses and 338 fatalities across all variants up to the end of 2022. The 787 family flew from 2011 to 2025 without a fatal accident; the first was Air India flight 171, a 787-8, in June 2025. The 787 also had a difficult start, with a fleet grounding over battery fires in 2013 and later production-quality problems at Boeing. Set against the tens of millions of flights the two families have completed, the risk on either is extremely low, and the airline’s maintenance and training matter more than the aircraft type.

 

Which airlines fly the A330-300 and the 787-9, and how do you check yours?

Both are common. Large A330-300 operators include Turkish Airlines, Cathay Pacific, China Southern, Air China, Delta, Qantas, SWISS, Korean Air and Aer Lingus. Large 787-9 operators include United, ANA, Japan Airlines, British Airways, Qantas, Air New Zealand, Qatar Airways, Etihad, Air Canada and American Airlines. Several airlines fly both.

To find out which one you are booked on:

1. Look at the flight details on the airline’s website or your booking confirmation. The aircraft is listed as a name or a code: 333 or A333 for the A330-300, 789 or B789 for the 787-9.
2. Open the seat map for your flight. Eight seats per row in economy (2-4-2) almost always means an A330. Nine per row (3-3-3) usually means a 787.
3. Check again a few days before departure. Airlines swap aircraft for operational reasons, and the type shown at booking is not guaranteed.

Be careful with similar codes. 339 is the newer A330-900neo, which has quieter engines and a refreshed cabin, and 788 and 781 are the shorter and longer 787 variants. The seat widths and layouts in this article apply to those too, but range and cabin age differ.

 

So which one should you choose?

Choose by cabin class and flight length, because the answer changes with both.

Your situation	Better choice	Why
Economy, flight over 10 hours	787-9	Lower cabin altitude and more humidity matter more as hours add up
Economy, flight under 8 hours	A330-300	The wider seat is the main thing you will feel
Couple in economy	A330-300	Window pairs with no third seat
Broad shoulders or tall, in economy	A330-300	About an inch more seat width
Premium economy or business	787-9	Seat width stops being an issue, and cabins are usually newer
Prone to jet lag, headaches or dry eyes	787-9	Better pressure and humidity
Like looking out of the window	787-9	Much larger windows
Need full darkness to sleep at a window	A330-300	A real shade blocks all light

We would not pay much extra or accept a bad connection for either aircraft. If the price and schedule are close, use the table. If they are not, take the cheaper or more convenient flight and pick a good seat on whichever aircraft you get.

The aircraft type is also the second thing to check, not the first. The airline’s own seat, its pitch (legroom) and the age of its cabin vary more between airlines than the two airframes vary from each other.

 

Frequently asked questions

Is the Boeing 787-9 bigger than the Airbus A330-300?

No, they are nearly the same size. The A330-300 is slightly longer (63.66 m against 62.8 m) and the 787-9 has a slightly wider cabin (5.49 m against 5.28 m). Both typically carry between 250 and 300 passengers.

Is the A330-300 an old plane?

The design is. It entered service in 1994 and Airbus no longer builds it. Individual aircraft vary: some have been refitted with new seats and entertainment systems, others still have the cabin they were delivered with. The seat map and recent passenger photos tell you more than the aircraft’s age.

Why do 787 economy seats feel narrow?

Because most airlines fit nine seats across a cabin Boeing designed for eight. That leaves about 17 to 17.3 inches per seat, against about 18 inches on an eight-across A330-300.

Does the 787-9 really reduce jet lag?

It reduces some of the things that make long flights tiring. The cabin is pressurised to about 6,000 feet instead of 8,000 and the air holds more moisture. It does not change the time zones you cross, so sleep timing and daylight still matter most.

Is the A330-300 safe?

Yes. It has flown for more than 30 years with a strong record, and it is maintained to the same regulatory standards as any newer aircraft.

Which is quieter, the A330-300 or the 787-9?

The 787-9 is quieter overall. On either aircraft, seats ahead of the wing are quieter than seats behind it.

What is the difference between the A330-300 and the A330-900neo?

The A330-900neo is the replacement for the A330-300. It has the same cabin width and usual 2-4-2 economy layout, with new engines, a longer wing, more range (up to 13,334 km) and an updated cabin.