| Irthlingborough to Oberkirch | 463.34 mi (745.68 km) |
| Irthlingborough to Obernburg am Main | 456.43 mi (734.56 km) |
| Irthlingborough to Obernkirchen | 410.95 mi (661.35 km) |
| Irthlingborough to Oberschleissheim | 605.89 mi (975.08 km) |
| Irthlingborough to Oberstdorf | 591.16 mi (951.39 km) |
| Irthlingborough to Obertraubling | 605.10 mi (973.82 km) |
| Irthlingborough to Obertshausen | 437.38 mi (703.89 km) |
| Irthlingborough to Oberursel | 423.15 mi (681.00 km) |
| Irthlingborough to Ochsenfurt | 499.34 mi (803.61 km) |
| Irthlingborough to Ochsenhausen | 551.03 mi (886.80 km) |
| Irthlingborough to Ochtrup | 329.95 mi (531.01 km) |
| Irthlingborough to Odenthal | 342.81 mi (551.70 km) |
| Irthlingborough to Oelde | 373.46 mi (601.02 km) |
| Irthlingborough to Oelsnitz | 565.99 mi (910.88 km) |
| Irthlingborough to Oer-Erkenschwick | 337.81 mi (543.65 km) |
