The distance from Portsmouth to London is approximately 104 kilometers (about 65 miles) as the crow flies. By road, the distance is roughly 74 to 76 miles (around 119 to 122 kilometers) depending on the route taken. Travel by train covers about 63 to 64 miles (102 to 103 kilometers), with fastest train journeys taking around 1 hour 27 minutes. Bus travel takes approximately 1 hour 30 minutes for the fastest service. The air travel distance is also about 104 kilometers (65 miles).