| Donaueschingen to Olivenza | 1,009.23 mi (1,624.19 km) |
| Donaueschingen to Olot | 494.76 mi (796.24 km) |
| Donaueschingen to Onate | 627.81 mi (1,010.36 km) |
| Donaueschingen to Onda | 702.57 mi (1,130.68 km) |
| Donaueschingen to Onteniente | 778.10 mi (1,252.23 km) |
| Donaueschingen to Orihuela | 830.93 mi (1,337.25 km) |
| Donaueschingen to Osuna | 1,010.63 mi (1,626.45 km) |
| Donaueschingen to Ourense | 884.60 mi (1,423.63 km) |
| Donaueschingen to Oviedo | 760.60 mi (1,224.06 km) |
| Donaueschingen to Paiporta | 737.62 mi (1,187.08 km) |
| Donaueschingen to Pajara | 1,814.66 mi (2,920.41 km) |
| Donaueschingen to Palafolls | 517.37 mi (832.63 km) |
| Donaueschingen to Palafrugell | 491.79 mi (791.46 km) |
| Donaueschingen to Palamos | 496.95 mi (799.77 km) |
| Donaueschingen to Palencia | 756.17 mi (1,216.93 km) |
