| Tilehurst to Orbetello | 847.67 mi (1,364.19 km) |
| Tilehurst to Oria | 1,167.53 mi (1,878.96 km) |
| Tilehurst to Oristano | 921.93 mi (1,483.71 km) |
| Tilehurst to Orta Nova | 1,057.03 mi (1,701.13 km) |
| Tilehurst to Orte | 884.73 mi (1,423.83 km) |
| Tilehurst to Ortona | 959.49 mi (1,544.15 km) |
| Tilehurst to Orvieto | 862.07 mi (1,387.36 km) |
| Tilehurst to Orzinuovi | 653.26 mi (1,051.32 km) |
| Tilehurst to Osimo | 871.21 mi (1,402.07 km) |
| Tilehurst to Ospitaletto | 650.84 mi (1,047.43 km) |
| Tilehurst to Ostuni | 1,154.04 mi (1,857.25 km) |
| Tilehurst to Ottaviano | 1,039.41 mi (1,672.78 km) |
| Tilehurst to Ovada | 648.67 mi (1,043.94 km) |
| Tilehurst to Ozieri | 890.69 mi (1,433.43 km) |
| Tilehurst to Paceco | 1,141.40 mi (1,836.91 km) |
