Great Circle Flight Layover Detour Calculator
Enter the latitude and longitude of your origin, layover city, and final destination to see the great-circle distance of your routed trip versus a direct flight, and how much detour distance the layover adds.
About this calculator
Calculate how much extra distance a layover adds to your trip using the haversine great-circle formula for origin, layover, and destination airports.
Frequently Asked Questions
What formula is used?
The haversine formula, which calculates the great-circle distance between two points on a sphere given their latitude and longitude, using Earth's radius of 3,958.8 miles.
Why isn't this the exact flight distance?
Actual flight paths account for wind, air traffic routing, and jet streams, so real distances may differ slightly from the great-circle calculation.
Where do I find airport coordinates?
Airport latitude and longitude can be found on aviation reference sites or by searching '[airport code] coordinates'.