| Portsmouth to Gaeta | 962.89 mi (1,549.63 km) |
| Portsmouth to Gaggiano | 596.89 mi (960.61 km) |
| Portsmouth to Galatina | 1,181.42 mi (1,901.32 km) |
| Portsmouth to Galatone | 1,178.50 mi (1,896.62 km) |
| Portsmouth to Galbiate | 591.73 mi (952.29 km) |
| Portsmouth to Gallarate | 576.11 mi (927.16 km) |
| Portsmouth to Galliate | 581.26 mi (935.45 km) |
| Portsmouth to Gallipoli | 1,180.33 mi (1,899.56 km) |
| Portsmouth to Gambettola | 776.92 mi (1,250.34 km) |
| Portsmouth to Gambolo | 597.71 mi (961.92 km) |
| Portsmouth to Garbagnate Milanese | 590.63 mi (950.53 km) |
| Portsmouth to Gardone Val Trompia | 626.79 mi (1,008.72 km) |
| Portsmouth to Garlasco | 602.33 mi (969.36 km) |
| Portsmouth to Gassino Torinese | 568.41 mi (914.77 km) |
| Portsmouth to Gatteo | 779.55 mi (1,254.56 km) |
