You can use any tool that measures distances between coordinates/places, or do it manually on google maps. If you find or get other results please let me know. The results that I got are as follows (all distances in km)
London to: The Hague 313, Brussels 321, Paris 343, Liverpool 286.
Miami to: Havana 364, Santiago de Cuba 780, Disneyworld 321, Tampa Int’l Airport 335.
Seattle to: Denver 1644, Phoenix 1793, Los Angeles 1544, Juneau 1435.
Marrakesh to: Montreal 5750, Miami 6957, San Juan 5971, Caracas 6469.
Kingsport, Tennessee to: Memphis 688, Chicago 738, Windsor (Canada) 639, New York City 876.
Algiers to: Athens 1832, London 1658, Santa Cruz de Tenerife 2027, southernmost point Algeria-Mali border 1974.
Sochi to: Minsk 1450, Moscow 1362, Haifa 1264, Athens 1483.
Saudi Arabia to (approx.): Cairo 370, Jerusalem 170, Baghdad 320, Dubai 270.
Rome to: Milan 479, Venice 395, Split 370, Tunis 598.
Mexico City to: Chihuahua 1240, San Antonio 1109, New Orleans 1481, Cancun 1297.
London to: The Hague 313, Brussels 321, Paris 343, Liverpool 286.
Miami to: Havana 364, Santiago de Cuba 780, Disneyworld 321, Tampa Int’l Airport 335.
Seattle to: Denver 1644, Phoenix 1793, Los Angeles 1544, Juneau 1435.
Marrakesh to: Montreal 5750, Miami 6957, San Juan 5971, Caracas 6469.
Kingsport, Tennessee to: Memphis 688, Chicago 738, Windsor (Canada) 639, New York City 876.
Algiers to: Athens 1832, London 1658, Santa Cruz de Tenerife 2027, southernmost point Algeria-Mali border 1974.
Sochi to: Minsk 1450, Moscow 1362, Haifa 1264, Athens 1483.
Saudi Arabia to (approx.): Cairo 370, Jerusalem 170, Baghdad 320, Dubai 270.
Rome to: Milan 479, Venice 395, Split 370, Tunis 598.
Mexico City to: Chihuahua 1240, San Antonio 1109, New Orleans 1481, Cancun 1297.