| Irthlingborough to Oerlinghausen | 394.00 mi (634.09 km) |
| Irthlingborough to Oestrich-Winkel | 405.99 mi (653.38 km) |
| Irthlingborough to Offenburg | 460.78 mi (741.55 km) |
| Irthlingborough to Oftersheim | 449.74 mi (723.79 km) |
| Irthlingborough to Ohrdruf | 497.51 mi (800.67 km) |
| Irthlingborough to Ohringen | 491.33 mi (790.72 km) |
| Irthlingborough to Olbernhau | 609.78 mi (981.34 km) |
| Irthlingborough to Olching | 598.05 mi (962.47 km) |
| Irthlingborough to Oldenburg | 373.41 mi (600.94 km) |
| Irthlingborough to Oldenburg in Holstein | 493.22 mi (793.76 km) |
| Irthlingborough to Olfen | 342.43 mi (551.10 km) |
| Irthlingborough to Olpe | 372.83 mi (600.01 km) |
| Irthlingborough to Olsberg | 393.90 mi (633.92 km) |
| Irthlingborough to Oranienburg | 581.93 mi (936.52 km) |
| Irthlingborough to Ortenberg | 438.55 mi (705.78 km) |
