| Haddington to Orbetello | 1,122.89 mi (1,807.11 km) |
| Haddington to Oria | 1,411.58 mi (2,271.71 km) |
| Haddington to Oristano | 1,223.91 mi (1,969.69 km) |
| Haddington to Orta Nova | 1,308.22 mi (2,105.38 km) |
| Haddington to Orte | 1,151.40 mi (1,852.99 km) |
| Haddington to Ortona | 1,212.33 mi (1,951.05 km) |
| Haddington to Orvieto | 1,128.90 mi (1,816.80 km) |
| Haddington to Orzinuovi | 914.48 mi (1,471.71 km) |
| Haddington to Osimo | 1,121.45 mi (1,804.80 km) |
| Haddington to Ospitaletto | 909.14 mi (1,463.13 km) |
| Haddington to Ostuni | 1,396.76 mi (2,247.88 km) |
| Haddington to Ottaviano | 1,302.27 mi (2,095.80 km) |
| Haddington to Ovada | 927.82 mi (1,493.18 km) |
| Haddington to Ozieri | 1,188.54 mi (1,912.77 km) |
| Haddington to Paceco | 1,429.59 mi (2,300.70 km) |
