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 Boeing 777-300ER is a remarkably efficient wide-body jet, largely thanks to its massive GE90-115B engines. On average, it consumes approximately 2,300 to 2,500 gallons of jet fuel per hour during cruise. When translated to weight, this is roughly 7.5 to 8 metric tons per hour. To put this in a more relatable perspective, the aircraft achieves about 70 to 85 seat-miles per gallon. This means that if the plane is full, it is roughly as fuel-efficient per person as a fuel-efficient compact car or a motorcycle. Factors such as the aircraft's take-off weight, head-winds, and altitude significantly impact these numbers, but it remains a gold standard for long-haul efficiency in the 2026 aviation market.