| Staines-upon-Thames to Orbetello | 829.92 mi (1,335.62 km) |
| Staines-upon-Thames to Oria | 1,147.62 mi (1,846.91 km) |
| Staines-upon-Thames to Oristano | 908.12 mi (1,461.48 km) |
| Staines-upon-Thames to Orta Nova | 1,037.49 mi (1,669.68 km) |
| Staines-upon-Thames to Orte | 866.20 mi (1,394.01 km) |
| Staines-upon-Thames to Ortona | 939.96 mi (1,512.72 km) |
| Staines-upon-Thames to Orvieto | 843.52 mi (1,357.52 km) |
| Staines-upon-Thames to Orzinuovi | 633.90 mi (1,020.16 km) |
| Staines-upon-Thames to Osimo | 851.40 mi (1,370.19 km) |
| Staines-upon-Thames to Ospitaletto | 631.25 mi (1,015.90 km) |
| Staines-upon-Thames to Ostuni | 1,134.04 mi (1,825.06 km) |
| Staines-upon-Thames to Ottaviano | 1,020.73 mi (1,642.70 km) |
| Staines-upon-Thames to Ovada | 631.03 mi (1,015.54 km) |
| Staines-upon-Thames to Ozieri | 876.06 mi (1,409.88 km) |
| Staines-upon-Thames to Paceco | 1,125.47 mi (1,811.26 km) |
