| Portsmouth to Giovinazzo | 1,076.13 mi (1,731.87 km) |
| Portsmouth to Giugliano in Campania | 999.38 mi (1,608.34 km) |
| Portsmouth to Giulianova | 900.47 mi (1,449.17 km) |
| Portsmouth to Giussano | 590.01 mi (949.53 km) |
| Portsmouth to Goito | 663.83 mi (1,068.33 km) |
| Portsmouth to Gonzaga | 682.77 mi (1,098.81 km) |
| Portsmouth to Gorgonzola | 604.23 mi (972.42 km) |
| Portsmouth to Gorizia | 752.42 mi (1,210.90 km) |
| Portsmouth to Gragnano | 1,022.69 mi (1,645.86 km) |
| Portsmouth to Grammichele | 1,216.37 mi (1,957.57 km) |
| Portsmouth to Granarolo del l'Emilia | 724.35 mi (1,165.73 km) |
| Portsmouth to Gravina in Puglia | 1,084.71 mi (1,745.67 km) |
| Portsmouth to Grezzana | 665.62 mi (1,071.20 km) |
| Portsmouth to Gricignano d'Aversa | 995.45 mi (1,602.02 km) |
| Portsmouth to Grosseto | 798.68 mi (1,285.35 km) |
