| Irthlingborough to Nyon | 512.79 mi (825.26 km) |
| Irthlingborough to Oberriet | 569.80 mi (917.00 km) |
| Irthlingborough to Obersiggenthal | 517.78 mi (833.28 km) |
| Irthlingborough to Oberwil | 491.93 mi (791.68 km) |
| Irthlingborough to Oberwingert | 532.71 mi (857.31 km) |
| Irthlingborough to Oftringen | 513.49 mi (826.39 km) |
| Irthlingborough to Olten | 511.30 mi (822.87 km) |
| Irthlingborough to Onex | 520.76 mi (838.08 km) |
| Irthlingborough to Opfikon | 529.66 mi (852.40 km) |
| Irthlingborough to Ostermundigen | 518.13 mi (833.84 km) |
| Irthlingborough to Payerne | 508.54 mi (818.41 km) |
| Irthlingborough to Pfaffikon | 540.21 mi (869.38 km) |
| Irthlingborough to Plan-les-Ouates | 522.16 mi (840.33 km) |
| Irthlingborough to Pratteln | 496.55 mi (799.11 km) |
| Irthlingborough to Prilly | 514.43 mi (827.89 km) |
