| Walton upon Thames to Orbetello | 824.62 mi (1,327.10 km) |
| Walton upon Thames to Oria | 1,142.30 mi (1,838.36 km) |
| Walton upon Thames to Oristano | 903.12 mi (1,453.43 km) |
| Walton upon Thames to Orta Nova | 1,032.16 mi (1,661.11 km) |
| Walton upon Thames to Orte | 860.88 mi (1,385.45 km) |
| Walton upon Thames to Ortona | 934.64 mi (1,504.16 km) |
| Walton upon Thames to Orvieto | 838.21 mi (1,348.96 km) |
| Walton upon Thames to Orzinuovi | 628.58 mi (1,011.59 km) |
| Walton upon Thames to Osimo | 846.08 mi (1,361.63 km) |
| Walton upon Thames to Ospitaletto | 625.93 mi (1,007.33 km) |
| Walton upon Thames to Ostuni | 1,128.73 mi (1,816.52 km) |
| Walton upon Thames to Ottaviano | 1,015.41 mi (1,634.14 km) |
| Walton upon Thames to Ovada | 625.74 mi (1,007.03 km) |
| Walton upon Thames to Ozieri | 870.98 mi (1,401.70 km) |
| Walton upon Thames to Paceco | 1,120.28 mi (1,802.91 km) |
