| Sligo to Oria | 1,533.23 mi (2,467.50 km) |
| Sligo to Oristano | 1,269.69 mi (2,043.37 km) |
| Sligo to Orta Nova | 1,422.88 mi (2,289.90 km) |
| Sligo to Orte | 1,249.79 mi (2,011.34 km) |
| Sligo to Ortona | 1,325.34 mi (2,132.92 km) |
| Sligo to Orvieto | 1,227.16 mi (1,974.92 km) |
| Sligo to Orzinuovi | 1,019.10 mi (1,640.08 km) |
| Sligo to Osimo | 1,236.98 mi (1,990.72 km) |
| Sligo to Ospitaletto | 1,016.68 mi (1,636.19 km) |
| Sligo to Ostuni | 1,519.67 mi (2,445.67 km) |
| Sligo to Ottaviano | 1,404.65 mi (2,260.57 km) |
| Sligo to Ovada | 1,012.32 mi (1,629.17 km) |
| Sligo to Ozieri | 1,242.77 mi (2,000.04 km) |
| Sligo to Paceco | 1,498.42 mi (2,411.48 km) |
| Sligo to Pachino | 1,650.35 mi (2,655.98 km) |
