| Illescas to Oerlinghausen | 1,011.73 mi (1,628.22 km) |
| Illescas to Oestrich-Winkel | 892.16 mi (1,435.79 km) |
| Illescas to Offenburg | 817.68 mi (1,315.93 km) |
| Illescas to Oftersheim | 881.06 mi (1,417.94 km) |
| Illescas to Ohrdruf | 1,019.06 mi (1,640.03 km) |
| Illescas to Ohringen | 904.87 mi (1,456.24 km) |
| Illescas to Olbernhau | 1,102.04 mi (1,773.56 km) |
| Illescas to Olching | 933.11 mi (1,501.69 km) |
| Illescas to Oldenburg | 1,063.06 mi (1,710.83 km) |
| Illescas to Oldenburg in Holstein | 1,193.76 mi (1,921.18 km) |
| Illescas to Olfen | 963.54 mi (1,550.67 km) |
| Illescas to Olpe | 938.68 mi (1,510.66 km) |
| Illescas to Olsberg | 974.59 mi (1,568.45 km) |
| Illescas to Oranienburg | 1,187.00 mi (1,910.30 km) |
| Illescas to Ortenberg | 942.68 mi (1,517.10 km) |
