| Portsmouth to Ascoli Piceno | 882.23 mi (1,419.81 km) |
| Portsmouth to Asola | 655.97 mi (1,055.68 km) |
| Portsmouth to Asolo | 689.12 mi (1,109.03 km) |
| Portsmouth to Assemini | 934.19 mi (1,503.44 km) |
| Portsmouth to Assisi | 836.26 mi (1,345.84 km) |
| Portsmouth to Asti | 592.62 mi (953.73 km) |
| Portsmouth to Atessa | 951.62 mi (1,531.49 km) |
| Portsmouth to Atri | 909.64 mi (1,463.92 km) |
| Portsmouth to Atripalda | 1,022.28 mi (1,645.20 km) |
| Portsmouth to Augusta | 1,232.66 mi (1,983.77 km) |
| Portsmouth to Aulla | 686.73 mi (1,105.18 km) |
| Portsmouth to Aurisina | 765.22 mi (1,231.50 km) |
| Portsmouth to Avellino | 1,020.98 mi (1,643.11 km) |
| Portsmouth to Aversa | 997.74 mi (1,605.71 km) |
| Portsmouth to Avezzano | 916.54 mi (1,475.03 km) |
