A Boeing 777-300ER has a full fuel capacity of 47,890 gallons and burns fuel at the rate of roughly 2,500 gallons per hour (depending on the conditions, such as winds aloft and takeoff weight). A typical flight from New York to London on the Boeing 777-300ER would then cost around $33,000 in fuel.

The fuel burn of a Boeing 777-300ER varies significantly based on its weight, altitude, speed, and weather conditions. However, for planning and general reference, the industry uses average figures.

Typical fuel burn for a Boeing 777-300ER is approximately 7,500 to 8,000 kilograms per hour (kg/h) or 16,500 to 17,600 pounds per hour (lbs/h).

To put this in more relatable terms, that’s roughly 2,400 to 2,600 US gallons per hour.

Key Factors That Cause Variation:

1. Weight: A heavily loaded aircraft (maximum takeoff weight ~352 tonnes) will burn significantly more fuel on takeoff and climb than a lighter one. The average figure is for “cruise” at a typical weight.
2. Flight Stage: Fuel burn is highest during takeoff and climb. During cruise at 35,000-40,000 feet, it’s at its most efficient. It decreases again during descent.
3. Distance of Flight: On very long flights (e.g., 14+ hours), the aircraft burns fuel and becomes much lighter, leading to a lower average burn rate over the entire trip compared to a shorter, heavier flight.
4. Speed (Mach): Flying faster (e.g., Mach 0.86) increases fuel burn compared to a more economical speed (e.g., Mach 0.84).
5. Wind & Weather: Headwinds increase flight time and total fuel burn, while tailwinds have the opposite effect. Turbulence and avoiding weather also increase consumption.

Example for Context: