| Leighton Buzzard to Orbetello | 857.89 mi (1,380.63 km) |
| Leighton Buzzard to Oria | 1,171.85 mi (1,885.92 km) |
| Leighton Buzzard to Oristano | 939.83 mi (1,512.50 km) |
| Leighton Buzzard to Orta Nova | 1,062.50 mi (1,709.94 km) |
| Leighton Buzzard to Orte | 893.04 mi (1,437.21 km) |
| Leighton Buzzard to Ortona | 965.05 mi (1,553.10 km) |
| Leighton Buzzard to Orvieto | 870.36 mi (1,400.71 km) |
| Leighton Buzzard to Orzinuovi | 659.50 mi (1,061.36 km) |
| Leighton Buzzard to Osimo | 875.98 mi (1,409.75 km) |
| Leighton Buzzard to Ospitaletto | 656.41 mi (1,056.39 km) |
| Leighton Buzzard to Ostuni | 1,158.09 mi (1,863.77 km) |
| Leighton Buzzard to Ottaviano | 1,047.26 mi (1,685.40 km) |
| Leighton Buzzard to Ovada | 659.25 mi (1,060.97 km) |
| Leighton Buzzard to Ozieri | 907.19 mi (1,459.98 km) |
| Leighton Buzzard to Paceco | 1,155.41 mi (1,859.46 km) |
