| Kos to Oria | 575.54 mi (926.24 km) |
| Kos to Oristano | 1,029.53 mi (1,656.87 km) |
| Kos to Orta Nova | 690.32 mi (1,110.96 km) |
| Kos to Orte | 878.11 mi (1,413.19 km) |
| Kos to Ortona | 780.57 mi (1,256.21 km) |
| Kos to Orvieto | 897.70 mi (1,444.71 km) |
| Kos to Orzinuovi | 1,073.35 mi (1,727.39 km) |
| Kos to Osimo | 856.86 mi (1,378.98 km) |
| Kos to Ospitaletto | 1,072.33 mi (1,725.75 km) |
| Kos to Ostuni | 584.39 mi (940.48 km) |
| Kos to Ottaviano | 739.03 mi (1,189.36 km) |
| Kos to Ovada | 1,108.17 mi (1,783.43 km) |
| Kos to Ozieri | 1,014.01 mi (1,631.89 km) |
| Kos to Paceco | 808.71 mi (1,301.50 km) |
| Kos to Pachino | 671.03 mi (1,079.93 km) |
