Live data·~100ms avg response·Free · No signup·Updated Jun 2026
Flight Distance Calculator
Great-circle distance between any two airports. Estimates flight time, fuel, and CO₂.
— km
Select two airports to calculate
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How to use this tool
- 1Enter origin airportType IATA code (e.g. JFK) or city name.
- 2Enter destination airportSame — IATA or city.
- 3Read the metricsDistance in km/mi, flight time, CO₂ emissions per passenger.
Frequently asked questions
How is flight distance calculated?
Great-circle distance — the shortest path on the Earth's surface — using verified airport coordinates from OpenFlights.
How accurate is the duration estimate?
Within ±10% for direct flights. Assumes average cruising speed of 850 km/h plus 30 min for taxi/climb/descent.
Is the CO₂ estimate per passenger?
Yes. Calculated using the DEFRA standard of ~115 g CO₂e per passenger-km for short-haul, 100 g for long-haul.