| Didymoteicho to Oria | 466.38 mi (750.57 km) |
| Didymoteicho to Oristano | 942.68 mi (1,517.10 km) |
| Didymoteicho to Orta Nova | 559.30 mi (900.11 km) |
| Didymoteicho to Orte | 728.96 mi (1,173.15 km) |
| Didymoteicho to Ortona | 626.03 mi (1,007.50 km) |
| Didymoteicho to Orvieto | 743.56 mi (1,196.65 km) |
| Didymoteicho to Orzinuovi | 875.91 mi (1,409.63 km) |
| Didymoteicho to Osimo | 679.36 mi (1,093.33 km) |
| Didymoteicho to Ospitaletto | 871.75 mi (1,402.95 km) |
| Didymoteicho to Ostuni | 466.41 mi (750.62 km) |
| Didymoteicho to Ottaviano | 626.42 mi (1,008.12 km) |
| Didymoteicho to Ovada | 928.34 mi (1,494.03 km) |
| Didymoteicho to Ozieri | 912.80 mi (1,469.01 km) |
| Didymoteicho to Paceco | 776.53 mi (1,249.70 km) |
| Didymoteicho to Pachino | 689.74 mi (1,110.02 km) |
