Distance between Philadelphia, Pennsylvania, USA and Boulder, Australia

18218 km = 11320 miles

We assume a spherical Earth as a close approximation of the true shape of the Earth (an oblate spheroid). The distance is calculated as great-circle or orthodromic distance between city centres on the surface of a sphere.

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Philadelphia, USA

Country: USA
State: Pennsylvania
Philadelphia’s coordinates: 39°57′08″ N, 75°09′49″ W
Population: 1,526,006
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Wikipedia article: Philadelphia

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Boulder, Australia

Country: Australia
Boulder’s coordinates: 30°46′55″ S, 121°29′28″ E
Population: 5,178
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Wikipedia article: Boulder

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