| Sligo to Novi di Modena | 1,077.37 mi (1,733.86 km) |
| Sligo to Novi Ligure | 1,010.94 mi (1,626.95 km) |
| Sligo to Nuoro | 1,267.87 mi (2,040.44 km) |
| Sligo to Occhiobello | 1,100.19 mi (1,770.58 km) |
| Sligo to Oderzo | 1,093.96 mi (1,760.55 km) |
| Sligo to Oggiono | 980.41 mi (1,577.82 km) |
| Sligo to Olbia | 1,239.04 mi (1,994.04 km) |
| Sligo to Oleggio | 964.23 mi (1,551.78 km) |
| Sligo to Olgiate Comasco | 966.98 mi (1,556.21 km) |
| Sligo to Olgiate Olona | 971.27 mi (1,563.10 km) |
| Sligo to Omegna | 943.00 mi (1,517.61 km) |
| Sligo to Opera | 994.88 mi (1,601.11 km) |
| Sligo to Oppeano | 1,068.19 mi (1,719.08 km) |
| Sligo to Orbassano | 956.80 mi (1,539.82 km) |
| Sligo to Orbetello | 1,211.27 mi (1,949.35 km) |
