Key Differences Between the Boeing 777 and Boeing 787 Airplanes

Boeing 777 vs Boeing 787 — both are long-haul, twin-engine widebodies, but they were built for different jobs. Here’s how they actually differ:

1. Size & Capacity:

777 is bigger: The 777-300ER is significantly larger than any 787. It typically seats 313-392 passengers vs 248-336 on the 787 family.
Length: 777-300ER is 63.7m, while 787 ranges from 57m (787-8) to 68m (787-10). The upcoming 777-9 will be 76.72m.

Cabin width: 777 cabin is wider — 19ft 3in vs 18ft on the 787. That extra width is why the 777 can do 10-abreast seating in economy more comfortably, while 9-abreast is tight on a 787.

2. Design Purpose:

777: Built as a high-capacity, long-haul workhorse to replace 747s and A340s. It’s for dense routes where you need to move a lot of people.

787 Dreamliner: Designed for efficiency, flexibility, and “thinner” long-haul routes. It prioritizes lower operating costs over sheer size.

Boeing doesn’t view them as direct competitors — 787 is for point-to-point, 777/777X for high-density.

3. Passenger Experience & Tech
Materials:

The 787 uses a composite fuselage; 777 is mostly aluminum. The new 777X borrows composite tech from the 787.

Cabin pressure & humidity: 787 is famous for higher cabin humidity and lower cabin altitude, which makes 14+ hour flights easier.

One passenger noted: “Spending 14 hours in 9% humidity on the 777 is not a great time” vs the Dreamliner.

Windows: 787 introduced much larger, electronically dimmable windows. The 777X is getting windows 16% bigger than the old 777, similar to the 787.

Interior: 777X takes a lot from the 787’s “Boeing Sky Interior” — higher ceilings, LED mood lighting, larger bins.

4. Performance & Efficiency:

Range: Varies by variant. 777-200LR: up to 8,555 nm. 787-9: ∼7,565 nm. The A350-1000 actually out-ranges the 777-9.

Fuel burn: 787 is more efficient per seat. 787-10 burns 2.27 liters/100km per seat vs 2.9 liters for 777-300ER. 777 uses 6,080-7,500 liters/hr vs 4,900-5,600 liters/hr on the 787.

Engines: 777 uses GE90, Trent 800, PW4000 with up to 115,300 lbf thrust. 787 uses Trent 1000 or GEnx at 76,000 lbf. 777X gets the massive GE9X.

5. Variants & Roles:

777 family: -200, -200ER, -200LR, -300, -300ER, 777F freighter, and upcoming 777X (-8, -9, -8F). There’s a dedicated freighter, 777F.
787 family: 787-8, 787-9, 787-10.

No freighter version exists. The 787-10 is closest in capacity to a 777 but still 60 seats short of the 777-8.

Age: 777 entered service in 1995. 787 entered service in 2011. 777X is due 2027.

6. Cost
List price: 777: $306.6M-$442.2M. 787: $248.3M-$338.4M.

Think of it this way: the 777 is the “jumbo twin” for hub-to-hub megaroutes. The 787 is the “route opener” that lets airlines fly long distances profitably with fewer passengers.

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