Rankings / Aircraft types / Boeing 757-300
2025 fuel burnBoeing 757-300
The 757-300 is the longest 757, and Boeing built only 55 of them. Delta and United fly the ones in this data.
- 1,386gallons per airborne hour
- 79.3seat-miles per gallon
- 234seats per flight on average
- 4,231gallons burned per flight
What the figures say
Boeing 757-300 ranks 7 of 25 types for seat-miles per gallon in 2025, at 79.3. The Boeing 737-800, the most common type in the table, flew 79.1, so a gallon on the Boeing 757-300 carried a seat 0.3% further. Over 1,000 miles, one seat on this type accounts for about 123 kg of CO2 from the fuel burned.
US airlines burned 132 million gallons on the Boeing 757-300 in 2025, 0.7% of the fuel burned on all scheduled passenger flying, over 95 thousand airborne hours and 31 thousand departures. The average flight spent 3.1 hours in the air and burned 4,231 gallons.
Since 2003, when it was first flown in volume, the type's figure has fallen from 80.1 to 79.3 seat-miles per gallon (1.0%). Its best year was 2020, at 83.7.
Airlines get different results from the same aircraft. Delta Air Lines flew 81.7 seat-miles per gallon on it and United Airlines 77.0, a gap of 6.1%. It isn't the seat count: Delta Air Lines put 234 seats on each flight and United Airlines 234. Flight length differs too, at 2.8 hours in the air per flight for Delta Air Lines and 3.3 for United Airlines. Longer flights normally burn less fuel per seat-mile, so the longer flights at United Airlines should have helped it, not hurt it. What's left comes from taxi and holding time, weight, engines, how each airline operates and how it allocates fuel to types when it reports, and the filings can't separate those.
What one seat costs the climate
CO2 for one seat on a Boeing 757-300, from the fuel burned, at the 2025 average.
- 61 kgover 500 miles
- 123 kgover 1,000 miles
- 246 kgover 2,000 miles
Who flies it, and how they burn
Boeing 757-300 by airline, 2025
| Airline | Fuel (million gallons) | Gallons per airborne hour | Seats per flight | Hours per flight | Seat-miles per gallon |
|---|---|---|---|---|---|
| United Airlines | 68 | 1,442 | 234 | 3.3 | 77.0 |
| Delta Air Lines | 63 | 1,330 | 234 | 2.8 | 81.7 |
Seats on the Boeing 757-300, airline by airline
The Boeing 757-300 has 216 seats at United Airlines and 234 at Delta Air Lines, 8% more on the same model. The seat count is what each airline reports for its own aircraft in 2025, for airlines with 10 or more.
Boeing 757-300 fleets, 2025
| Airline | Aircraft | Average seats | Fewest to most | Average age |
|---|---|---|---|---|
| United Airlines | 21 | 216.0 | 216 | 22.8 |
| Delta Air Lines | 16 | 234.0 | 234 | 22.4 |
See every airline's fleet on the fleets page.
Similar-sized aircraft
These types carry within about 25 seats of the Boeing 757-300, so they compete for the same routes.
How to read this. Fuel is what airlines issued to the type in 2025, as filed with the US Bureau of Transportation Statistics, counted only for the hours spent on scheduled passenger flights and divided by the hours in the air. It includes fuel burned taxiing and holding, so it's higher than the cruise figure in a manual. CO2 is 9.75 kg per gallon of jet fuel.
More from Boeing
Browse the Boeing manufacturer hub and its other profiled types:
- Boeing 737 MAX 9
- Boeing 737 MAX 8
- Boeing 787-10
- Boeing 737-900ER
- Boeing 737-800
- Boeing 787-9
- Boeing 787-8
- Boeing 737-700
- Boeing 757-200
- Boeing 767-400ER
- Boeing 777-300ER
- Boeing 777-200
- Boeing 767-300ER
Nearby in fuel efficiency
Types on either side of this one in the seat-miles per gallon table, regardless of size:
Source: US Bureau of Transportation Statistics (BTS), Schedule T-2 fuel and airborne hours; US EPA jet-fuel CO2 factor. See the methodology and flight-hour definitions.
Back to all aircraft types, or see how the airlines compare on the airline pages.