| Pen-y-Bont ar Ogwr to Olivares | 981.62 mi (1,579.77 km) |
| Pen-y-Bont ar Ogwr to Olivenza | 902.10 mi (1,451.79 km) |
| Pen-y-Bont ar Ogwr to Olot | 704.62 mi (1,133.98 km) |
| Pen-y-Bont ar Ogwr to Onate | 588.00 mi (946.29 km) |
| Pen-y-Bont ar Ogwr to Onda | 813.30 mi (1,308.87 km) |
| Pen-y-Bont ar Ogwr to Onteniente | 888.12 mi (1,429.30 km) |
| Pen-y-Bont ar Ogwr to Orihuela | 936.11 mi (1,506.53 km) |
| Pen-y-Bont ar Ogwr to Osuna | 989.03 mi (1,591.69 km) |
| Pen-y-Bont ar Ogwr to Ourense | 664.82 mi (1,069.93 km) |
| Pen-y-Bont ar Ogwr to Oviedo | 572.72 mi (921.71 km) |
| Pen-y-Bont ar Ogwr to Paiporta | 848.32 mi (1,365.25 km) |
| Pen-y-Bont ar Ogwr to Pajara | 1,690.32 mi (2,720.31 km) |
| Pen-y-Bont ar Ogwr to Palafolls | 742.53 mi (1,194.98 km) |
| Pen-y-Bont ar Ogwr to Palafrugell | 734.79 mi (1,182.53 km) |
| Pen-y-Bont ar Ogwr to Palamos | 738.65 mi (1,188.74 km) |
