| Shannon to Olivenza | 972.90 mi (1,565.74 km) |
| Shannon to Olot | 898.32 mi (1,445.71 km) |
| Shannon to Onate | 731.93 mi (1,177.93 km) |
| Shannon to Onda | 970.32 mi (1,561.58 km) |
| Shannon to Onteniente | 1,037.49 mi (1,669.68 km) |
| Shannon to Orihuela | 1,079.73 mi (1,737.65 km) |
| Shannon to Osuna | 1,084.95 mi (1,746.06 km) |
| Shannon to Ourense | 718.52 mi (1,156.34 km) |
| Shannon to Oviedo | 661.05 mi (1,063.85 km) |
| Shannon to Paiporta | 1,001.73 mi (1,612.13 km) |
| Shannon to Pajara | 1,704.55 mi (2,743.22 km) |
| Shannon to Palafolls | 935.55 mi (1,505.62 km) |
| Shannon to Palafrugell | 932.30 mi (1,500.40 km) |
| Shannon to Palamos | 935.52 mi (1,505.57 km) |
| Shannon to Palencia | 766.07 mi (1,232.87 km) |
