Flight Time Calculator

How to Use the Flight Time Calculator

Enter the latitude and longitude of your departure airport and destination airport in decimal degrees. Pick an aircraft class — the calculator fills in a typical cruise speed automatically — and set the taxi/ground time (the default of 20 minutes is a good starting point for typical commercial airports). The calculator returns the great-circle distance in kilometers, miles, and nautical miles, the air time at cruise speed, and the total duration including taxi. The default example is JFK (40.6413, -73.7781) to London Heathrow (51.4700, -0.4543), a classic transatlantic route.

How Airlines Actually Compute Flight Time

Real flight time is computed differently by different airlines and flight planning systems. Planners start with the great-circle distance between the two airports, then add wind, ATC routing constraints, weather diversions, and expected approach and climb times. Some routes are padded for block time to improve on-time statistics. Jet stream effects can add or subtract an hour across the Atlantic, which is why westbound flights are typically longer than eastbound ones on the same pair of airports. Short-haul flights have proportionally more taxi and approach time, so padding them by 30 percent of cruise time is a reasonable rule of thumb.

Typical Cruise Speeds by Aircraft Class

Modern commercial jets such as the Boeing 737, Airbus A320, Boeing 777, and Airbus A350 cruise at roughly 900 kilometers per hour (485 knots, Mach 0.78 to 0.85). Regional jets like the Embraer E-jets and the Bombardier CRJ cruise at about 780 km/h. Turboprops such as the ATR 72 and Dash 8 cruise at about 520 km/h. Business jets range from 780 to 900 km/h depending on the model. A Cessna 172, the classic trainer aircraft, cruises at about 230 km/h. A typical helicopter cruises at around 260 km/h. Cruise speed is always lower than maximum speed because aircraft trade speed for fuel efficiency and engine longevity.

Limitations of the Estimate

The number this calculator returns should be treated as a rough planning estimate, not a precise arrival time. Real flights are subject to headwinds and tailwinds that can shift the duration by 10 percent or more on long-haul routes, air traffic control routing that adds miles, weather diversions that add time, holding patterns at busy destinations that add further delays, and taxi times that vary wildly by airport. For serious planning, check a flight tracker service that shows real historical durations on your specific route, and trust that data over any theoretical calculation. This tool is most useful for quick sanity checks, travel planning, and teaching the fundamentals of flight duration math.

Frequently Asked Questions

How is flight time calculated?

Great-circle distance divided by cruise speed, plus taxi and ground time. This gives a theoretical minimum that real flights approach but rarely match exactly.

Why is my real flight time different?

Winds, ATC routing, weather, holding patterns, and taxi time all add to the theoretical great-circle time. Westbound transatlantic flights are typically longer because of headwinds.

What cruise speeds should I use?

~900 km/h for commercial jets, ~780 km/h for regional jets and bizjets, ~520 km/h for turboprops, ~230 km/h for Cessna 172, ~260 km/h for helicopters.

Does it include taxi time?

Yes, 20 minutes by default. Busy hubs like JFK or Heathrow can have 30+ minutes. Small GA airports often have under 5 minutes.

Is great-circle distance accurate enough?

For planning, yes. Real routes are within a few percent of great-circle, mostly due to wind-optimal routing.