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

Can I calculate the distance of a flight with a connection or a round trip?

Yes. Enter the connecting airports under Stops, for example DXB, SIN, and tick Round trip if you fly back the same way. You get every leg with its distance and block time, the total in kilometres, miles and nautical miles, and how much longer the connection is than flying nonstop.

Which airports and cities can I enter?

Any IATA airport code from the built-in list of major airports, the name of almost any city in the world (the largest city with that name is used; add a country code such as Paris, FR to choose another), or coordinates like 40.7128, -74.0060.

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.

How much does a 5% route allowance add to a 1,000-mile flight estimate?

A 5% allowance adds 50 miles, making the route estimate 1,050 miles. The allowance is applied to the great-circle distance to represent a potentially less direct route. It is a planning estimate, not a record of the path a particular aircraft will fly. Actual routing can vary with weather, airspace, and airline operations.

How do I estimate flight time if I know the route is 3,000 miles?

Convert the distance to the same unit used for speed, then divide by the aircraft's cruising speed. For example, 3,000 miles is about 4,828 kilometers; at 900 km/h, the simple cruise-time estimate is about 5.4 hours. The calculator estimates time from route distance and aircraft cruising speed. Wind, climb, descent, taxiing, and scheduling can make a real trip longer or shorter.

Why can the bearing from a flight distance calculator look odd on a map?

The calculator reports the initial bearing, the direction to start along the great-circle route. That route follows Earth's curved surface, so its direction can change as it travels; it may not match a straight line drawn on a flat map. Map projections also distort direction and distance, especially at high latitudes. Treat the bearing as the route's starting direction, not a constant heading for the whole flight.