Flight Time Speed Distance Calculator

Flight time: t = d / GS

What sets your flight time is ground speed (GS), not True Airspeed by itself. GS = TAS ± wind component, so a tailwind adds while a headwind subtracts. Take a B777 cruising at TAS 480 kt: throw in a 100 kt tailwind and you get GS 580 kt. For a real example, São Paulo (GRU) to New York (JFK) runs roughly 7,681 km. At 850 km/h block speed that works out to about 9 hours, though a strong jet stream can cut nearly an hour off northbound legs. The Pilot's Operating Handbook and the flight computer (E6B or FMS) lean on the same triangle of velocities to produce the ETA. That's also why round-trip time is rarely symmetric: winds aloft tend to favor eastbound flight.

Applications

Filing a flight plan (FPL) with ATC. Working out fuel load and alternates. RAIM prediction for GPS approaches. Crew duty time planning under FTL rules. Passenger ETA boards and gate management. Slot scheduling at congested airports. The performance section of a dispatch release.

FAQ

Why does the same route have different durations each day? Because winds aloft shift from one day to the next. A 100 kt jet stream alone can move the ETA by 30-60 minutes on a long-haul leg.

Is block time the same as flight time? No. Block time runs from chocks off to chocks on, so it covers taxi plus the flight itself, while flight time is just wheels-up to wheels-down. Airlines build their schedules around block time.

How do pilots forecast winds? They read wind/temperature charts (FB/WAFS) and rely on the flight management system, which interpolates the winds at each waypoint and keeps refining the ETA as the flight progresses.