| Biggleswade to Orbetello | 854.25 mi (1,374.79 km) |
| Biggleswade to Oria | 1,164.65 mi (1,874.32 km) |
| Biggleswade to Oristano | 940.99 mi (1,514.38 km) |
| Biggleswade to Orta Nova | 1,055.99 mi (1,699.45 km) |
| Biggleswade to Orte | 888.26 mi (1,429.51 km) |
| Biggleswade to Ortona | 958.64 mi (1,542.78 km) |
| Biggleswade to Orvieto | 865.58 mi (1,393.01 km) |
| Biggleswade to Orzinuovi | 653.74 mi (1,052.09 km) |
| Biggleswade to Osimo | 869.18 mi (1,398.81 km) |
| Biggleswade to Ospitaletto | 650.28 mi (1,046.52 km) |
| Biggleswade to Ostuni | 1,150.74 mi (1,851.93 km) |
| Biggleswade to Ottaviano | 1,042.10 mi (1,677.10 km) |
| Biggleswade to Ovada | 656.04 mi (1,055.80 km) |
| Biggleswade to Ozieri | 907.45 mi (1,460.40 km) |
| Biggleswade to Paceco | 1,153.95 mi (1,857.10 km) |
