| Ruislip to Oerlinghausen | 389.74 mi (627.22 km) |
| Ruislip to Oestrich-Winkel | 383.86 mi (617.76 km) |
| Ruislip to Offenburg | 428.68 mi (689.90 km) |
| Ruislip to Oftersheim | 424.46 mi (683.10 km) |
| Ruislip to Ohrdruf | 485.66 mi (781.60 km) |
| Ruislip to Ohringen | 466.90 mi (751.40 km) |
| Ruislip to Olbernhau | 599.41 mi (964.66 km) |
| Ruislip to Olching | 571.85 mi (920.30 km) |
| Ruislip to Oldenburg | 380.33 mi (612.08 km) |
| Ruislip to Oldenburg in Holstein | 506.71 mi (815.47 km) |
| Ruislip to Olfen | 335.09 mi (539.28 km) |
| Ruislip to Olpe | 359.02 mi (577.79 km) |
| Ruislip to Olsberg | 383.89 mi (617.82 km) |
| Ruislip to Oranienburg | 584.13 mi (940.06 km) |
| Ruislip to Ortenberg | 421.07 mi (677.65 km) |
