One of the longer but more common international flights is from Los Angles International Airport in Los Angles, Calif., to Narita International Airport in Tokyo. This flight is 5,445 miles. The Boeing 747-8, one of the most fuel-efficient planes in the world, gets roughly 5.4 miles per gallon of fuel. It burns through approximately 29,403 gallons of fuel on this flight.
As of Sept. 29, 2014, Qantas Airlines offers the longest nonstop international flight from Dallas to Sydney. This trip is 8,578 miles long, and it takes approximately 17 hours to complete. The aircraft used for this flight is an Airbus A380, which has a fuel economy of roughly 6.85 miles per gallon. The Dallas-to-Sydney trip requires approximately 58,775 gallons of fuel, which uses about 68 percent of the A380's fuel capacity.
Other long-distance international flights include a flight from Atlanta to Johannesburg at 8,439 miles, Los Angles to Abu Dhabi at 8,390 miles, Los Angles to Dubai at 8,339 miles and Los Angles to Jeddah at 8,332 miles. The majority of these lengthy flights take approximately 16 to 17 hours to complete, and over the course of the flight, the airplanes burn anywhere from 42,000 to 50,000 gallons of fuel.