Flight Mileage Calculator

This uses the great-circle (haversine) formula, which calculates the shortest distance between two points on Earth's surface based on their latitude and longitude — the same path a plane actually flies for long routes, since it's shorter than a straight line on a flat map.

Air traffic control routing, weather diversions, and holding patterns can add extra distance beyond the direct great-circle path — this calculator gives the theoretical minimum distance, which is usually very close to (but occasionally a bit less than) the actual flown distance.

Not always — many airlines (Delta, United, American) now award miles based on the DOLLAR AMOUNT spent rather than distance flown, while some international carriers and alliance programs still use distance-based earning. Check your specific program's earning rules; this calculator shows the distance-based estimate only.

Use the custom coordinates option to enter any two latitude/longitude points directly — useful for smaller regional airports not included in the preset list.

Check the round-trip box to simply double the one-way distance, time, and miles-earned figures — a round trip covers the same route twice.