| Kalkara to Oerlinghausen | 1,147.58 mi (1,846.85 km) |
| Kalkara to Oestrich-Winkel | 1,028.38 mi (1,655.01 km) |
| Kalkara to Offenburg | 931.46 mi (1,499.04 km) |
| Kalkara to Oftersheim | 978.49 mi (1,574.72 km) |
| Kalkara to Ohrdruf | 1,049.29 mi (1,688.66 km) |
| Kalkara to Ohringen | 954.10 mi (1,535.48 km) |
| Kalkara to Olbernhau | 1,022.76 mi (1,645.98 km) |
| Kalkara to Olching | 866.21 mi (1,394.03 km) |
| Kalkara to Oldenburg | 1,230.93 mi (1,980.99 km) |
| Kalkara to Oldenburg in Holstein | 1,284.00 mi (2,066.40 km) |
| Kalkara to Olfen | 1,148.81 mi (1,848.83 km) |
| Kalkara to Olpe | 1,096.71 mi (1,764.98 km) |
| Kalkara to Olsberg | 1,109.27 mi (1,785.19 km) |
| Kalkara to Oranienburg | 1,166.97 mi (1,878.06 km) |
| Kalkara to Ortenberg | 1,036.24 mi (1,667.67 km) |
