| Caldas de Reyes to Oerlinghausen | 1,033.01 mi (1,662.47 km) |
| Caldas de Reyes to Oestrich-Winkel | 941.23 mi (1,514.77 km) |
| Caldas de Reyes to Offenburg | 896.00 mi (1,441.97 km) |
| Caldas de Reyes to Oftersheim | 946.73 mi (1,523.62 km) |
| Caldas de Reyes to Ohrdruf | 1,074.45 mi (1,729.17 km) |
| Caldas de Reyes to Ohringen | 980.59 mi (1,578.11 km) |
| Caldas de Reyes to Olbernhau | 1,175.64 mi (1,892.00 km) |
| Caldas de Reyes to Olching | 1,038.68 mi (1,671.60 km) |
| Caldas de Reyes to Oldenburg | 1,063.01 mi (1,710.75 km) |
| Caldas de Reyes to Oldenburg in Holstein | 1,198.23 mi (1,928.36 km) |
| Caldas de Reyes to Olfen | 977.62 mi (1,573.33 km) |
| Caldas de Reyes to Olpe | 968.33 mi (1,558.37 km) |
| Caldas de Reyes to Olsberg | 1,004.26 mi (1,616.20 km) |
| Caldas de Reyes to Oranienburg | 1,228.06 mi (1,976.37 km) |
| Caldas de Reyes to Ortenberg | 993.98 mi (1,599.66 km) |
