| Illescas to Oberkirch | 825.89 mi (1,329.15 km) |
| Illescas to Obernburg am Main | 921.27 mi (1,482.64 km) |
| Illescas to Obernkirchen | 1,039.91 mi (1,673.58 km) |
| Illescas to Oberschleissheim | 944.75 mi (1,520.43 km) |
| Illescas to Oberstdorf | 863.77 mi (1,390.11 km) |
| Illescas to Obertraubling | 993.92 mi (1,599.55 km) |
| Illescas to Obertshausen | 921.81 mi (1,483.50 km) |
| Illescas to Oberursel | 920.18 mi (1,480.88 km) |
| Illescas to Ochsenfurt | 944.21 mi (1,519.57 km) |
| Illescas to Ochsenhausen | 875.13 mi (1,408.38 km) |
| Illescas to Ochtrup | 985.45 mi (1,585.94 km) |
| Illescas to Odenthal | 919.47 mi (1,479.75 km) |
| Illescas to Oelde | 990.43 mi (1,593.95 km) |
| Illescas to Oelsnitz | 1,050.34 mi (1,690.36 km) |
| Illescas to Oer-Erkenschwick | 955.99 mi (1,538.52 km) |
