| Illescas to Octeville | 665.71 mi (1,071.35 km) |
| Illescas to Oignies | 787.69 mi (1,267.67 km) |
| Illescas to Oissel | 681.32 mi (1,096.48 km) |
| Illescas to Olivet | 606.02 mi (975.30 km) |
| Illescas to Ollioules | 541.38 mi (871.27 km) |
| Illescas to Olonne-sur-Mer | 455.42 mi (732.93 km) |
| Illescas to Oloron-Sainte-Marie | 270.06 mi (434.62 km) |
| Illescas to Onet Village | 440.49 mi (708.90 km) |
| Illescas to Onnaing | 795.47 mi (1,280.18 km) |
| Illescas to Orange | 522.42 mi (840.75 km) |
| Illescas to Orchies | 793.17 mi (1,276.49 km) |
| Illescas to Orleans | 608.53 mi (979.33 km) |
| Illescas to Orly | 670.03 mi (1,078.31 km) |
| Illescas to Ormesson-sur-Marne | 675.83 mi (1,087.65 km) |
| Illescas to Orsay | 662.71 mi (1,066.53 km) |
