| Portsmouth to Amelia | 855.02 mi (1,376.03 km) |
| Portsmouth to Anagni | 921.76 mi (1,483.43 km) |
| Portsmouth to Ancona | 844.03 mi (1,358.33 km) |
| Portsmouth to Andria | 1,060.88 mi (1,707.32 km) |
| Portsmouth to Angri | 1,022.54 mi (1,645.63 km) |
| Portsmouth to Anguillara Sabazia | 873.54 mi (1,405.83 km) |
| Portsmouth to Anzio | 918.88 mi (1,478.79 km) |
| Portsmouth to Anzola dell'Emilia | 715.07 mi (1,150.79 km) |
| Portsmouth to Aosta | 521.15 mi (838.71 km) |
| Portsmouth to Apricena | 1,002.24 mi (1,612.95 km) |
| Portsmouth to Aprilia | 912.50 mi (1,468.52 km) |
| Portsmouth to Aradeo | 1,181.80 mi (1,901.93 km) |
| Portsmouth to Aragona | 1,174.44 mi (1,890.08 km) |
| Portsmouth to Arco | 643.90 mi (1,036.26 km) |
| Portsmouth to Arcola | 689.36 mi (1,109.42 km) |
