| Delfzijl to Olivenza | 1,210.42 mi (1,947.98 km) |
| Delfzijl to Olot | 797.05 mi (1,282.72 km) |
| Delfzijl to Onate | 829.90 mi (1,335.60 km) |
| Delfzijl to Onda | 983.40 mi (1,582.63 km) |
| Delfzijl to Onteniente | 1,064.06 mi (1,712.45 km) |
| Delfzijl to Orihuela | 1,118.11 mi (1,799.43 km) |
| Delfzijl to Osuna | 1,252.56 mi (2,015.80 km) |
| Delfzijl to Ourense | 1,019.34 mi (1,640.48 km) |
| Delfzijl to Oviedo | 901.84 mi (1,451.37 km) |
| Delfzijl to Paiporta | 1,021.10 mi (1,643.30 km) |
| Delfzijl to Pajara | 2,029.28 mi (3,265.80 km) |
| Delfzijl to Palafolls | 828.67 mi (1,333.62 km) |
| Delfzijl to Palafrugell | 807.61 mi (1,299.72 km) |
| Delfzijl to Palamos | 812.80 mi (1,308.07 km) |
| Delfzijl to Palencia | 943.58 mi (1,518.54 km) |
