Flight Distance Calculator

The Flight Distance Calculator estimates the air distance between two airports, major cities, or coordinate points using the great-circle formula. It reports kilometers, statute miles, nautical miles, initial bearing, midpoint, and estimated flight time based on typical aircraft cruising speeds.

How to Use the Flight Distance Calculator

1. Enter the origin as an IATA code, airport name, city name, or decimal coordinates.
2. Enter the destination in the same format.
3. Choose an aircraft profile and a route allowance. Use 0% for pure great-circle distance, 5% for a typical airline route estimate, or 10% for more indirect routing.
4. Click Calculate Flight Distance to view distance, estimated block time, bearing, midpoint, and aircraft speed comparisons.

Great-Circle Distance Formula

This tool uses the haversine great-circle method with a mean Earth radius of 6,371.0088 km. Great-circle distance is the shortest surface path between two latitude-longitude points, which makes it the standard starting point for airport-to-airport and city-to-city air distance estimates.

Typical Aircraft Cruising Speeds

FAQ

What does great-circle distance mean?

Great-circle distance is the shortest path between two points on the surface of a sphere. For flights, it is the standard baseline for air-route distance because aircraft travel over the curved surface of Earth rather than along a flat map line.

Why is the actual flight distance sometimes longer?

Airlines may fly around weather, restricted airspace, winds, oceanic tracks, traffic flows, or required airways. The route allowance option adds a practical buffer to the great-circle distance so the time estimate is closer to typical airline routing.

Can I use airport codes and city names?

Yes. You can enter common IATA airport codes such as JFK, LHR, LAX, DXB, SIN, SYD, and AKL, major city names such as London or Tokyo, or coordinates in decimal degrees such as 40.7128,-74.0060.

How is estimated flight time calculated?

The calculator divides route distance by the selected cruising speed, then adds a small block-time allowance for ground movement, climb, descent, and approach. It is a planning estimate, not a live airline schedule.

What is the difference between miles and nautical miles?

A statute mile is 1.609344 kilometers. A nautical mile is exactly 1.852 kilometers and is widely used in aviation and navigation because it relates to latitude on Earth.