The "Haversine" formula computes distance between two points along a spheroid (such as Earth). You will need to know the coordinates of each city to use this formula. Coordinates for nearly all cities in the world can be downloaded from the geonames.org website for free. The Google geocoder will also return those coordinates but you'll have to obey the terms in order for you to use that service. For the exact formula, try searching Google.
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