How far is it?
Pick any two of 1,300+ world cities for the straight-line great-circle distance, a geographic view of the shortest surface route, and both local clocks right now.
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What the number means
The distance follows the shortest path over Earth's surface, the same arc airlines roughly fly, computed with the haversine formula on a sphere of 6,371 km radius. Actual flight routes weave around weather, winds, and airspace, so real air miles run a few percent longer; road distance can be far longer. The animated trace describes progress along the mathematical surface arc, not an aircraft's speed or route.