Great Circle Flight Distance Calculator
Calculate great circle nautical miles, kilometers, and flight durations between coordinates.
Great Circle Flight Distance & Heading Calculator
Compute exact spherical geodesic distances, initial navigation bearings, and commercial flight durations between airports or geographical coordinates using the Haversine equation.
Flight Path Schematic (World Projection)
About this tool
How to use it
- Select an origin and destination airport from top international hubs or enter custom latitude and longitude coordinates.
- Choose your aircraft speed category (Commercial Jet, Long-Haul Widebody, Regional Jet, or Turboprop).
- Inspect the calculated geodesic distance in Nautical Miles, Kilometers, and Statute Miles.
- Review the estimated flight duration, initial and final compass navigation bearings, and interactive world route arc.
Why it matters
Because the Earth is an oblate spheroid, the shortest path between two points is a Great Circle arc rather than a straight line on a flat Mercator projection map. Commercial airlines follow these arcs to save thousands of gallons of jet fuel.
When to use it
Use this tool to plan flight itineraries, estimate airline travel times, calculate pilot flight logging nautical miles, or explore global aviation geography.
Common questions
Why does a Great Circle flight path look curved on flat maps?
Flat world maps use projections (such as Mercator) that distort higher latitudes. The shortest surface path on a 3D sphere curves northward in the northern hemisphere when projected onto a 2D flat grid.
What is the difference between a Nautical Mile and a Statute Mile?
A Nautical Mile (NM) is equal to exactly 1,852 meters (approx 1.1508 statute miles), based historically on one minute of latitude of arc along the Earth's meridian.
How accurate is the flight duration estimate?
The duration estimate calculates great circle cruise speed plus a standard 30-minute buffer for airport taxiing, initial climb, and arrival approach procedures. Actual gate-to-gate times vary with jetstream headwinds and airport delays.
What is an initial compass bearing?
The initial bearing (forward azimuth) is the starting compass course a pilot must steer when departing the origin airport. Because Great Circle routes are not rhumb lines, the heading gradually shifts across the flight.