| Ardahan to Orbetello | 1,615.86 mi (2,600.48 km) |
| Ardahan to Oria | 1,307.23 mi (2,103.78 km) |
| Ardahan to Oristano | 1,782.37 mi (2,868.45 km) |
| Ardahan to Orta Nova | 1,397.10 mi (2,248.42 km) |
| Ardahan to Orte | 1,556.32 mi (2,504.65 km) |
| Ardahan to Ortona | 1,455.12 mi (2,341.79 km) |
| Ardahan to Orvieto | 1,568.19 mi (2,523.76 km) |
| Ardahan to Orzinuovi | 1,663.44 mi (2,677.05 km) |
| Ardahan to Osimo | 1,494.48 mi (2,405.13 km) |
| Ardahan to Ospitaletto | 1,656.42 mi (2,665.75 km) |
| Ardahan to Ostuni | 1,307.08 mi (2,103.54 km) |
| Ardahan to Ottaviano | 1,465.85 mi (2,359.05 km) |
| Ardahan to Ovada | 1,728.73 mi (2,782.12 km) |
| Ardahan to Ozieri | 1,750.59 mi (2,817.30 km) |
| Ardahan to Paceco | 1,612.75 mi (2,595.47 km) |
