| Sligo to Olivenza | 1,078.49 mi (1,735.66 km) |
| Sligo to Olot | 973.29 mi (1,566.36 km) |
| Sligo to Onate | 823.32 mi (1,325.01 km) |
| Sligo to Onda | 1,059.49 mi (1,705.09 km) |
| Sligo to Onteniente | 1,129.16 mi (1,817.21 km) |
| Sligo to Orihuela | 1,173.09 mi (1,887.91 km) |
| Sligo to Osuna | 1,187.80 mi (1,911.57 km) |
| Sligo to Ourense | 824.79 mi (1,327.37 km) |
| Sligo to Oviedo | 762.94 mi (1,227.83 km) |
| Sligo to Paiporta | 1,092.11 mi (1,757.58 km) |
| Sligo to Pajara | 1,812.89 mi (2,917.57 km) |
| Sligo to Palafolls | 1,010.98 mi (1,627.02 km) |
| Sligo to Palafrugell | 1,005.52 mi (1,618.23 km) |
| Sligo to Palamos | 1,009.07 mi (1,623.95 km) |
| Sligo to Palencia | 865.41 mi (1,392.75 km) |
