| Peterborough to Orbetello | 878.20 mi (1,413.32 km) |
| Peterborough to Oria | 1,183.99 mi (1,905.44 km) |
| Peterborough to Oristano | 969.49 mi (1,560.24 km) |
| Peterborough to Orta Nova | 1,076.31 mi (1,732.16 km) |
| Peterborough to Orte | 910.86 mi (1,465.88 km) |
| Peterborough to Ortona | 979.16 mi (1,575.80 km) |
| Peterborough to Orvieto | 888.19 mi (1,429.41 km) |
| Peterborough to Orzinuovi | 675.37 mi (1,086.90 km) |
| Peterborough to Osimo | 889.25 mi (1,431.11 km) |
| Peterborough to Ospitaletto | 671.44 mi (1,080.58 km) |
| Peterborough to Ostuni | 1,169.88 mi (1,882.74 km) |
| Peterborough to Ottaviano | 1,064.17 mi (1,712.61 km) |
| Peterborough to Ovada | 680.62 mi (1,095.35 km) |
| Peterborough to Ozieri | 935.20 mi (1,505.06 km) |
| Peterborough to Paceco | 1,180.01 mi (1,899.04 km) |
