| Kostanjevica na Krki to Octeville | 832.86 mi (1,340.36 km) |
| Kostanjevica na Krki to Oignies | 654.80 mi (1,053.79 km) |
| Kostanjevica na Krki to Oissel | 708.86 mi (1,140.79 km) |
| Kostanjevica na Krki to Olivet | 653.12 mi (1,051.10 km) |
| Kostanjevica na Krki to Ollioules | 507.36 mi (816.51 km) |
| Kostanjevica na Krki to Olonne-sur-Mer | 822.32 mi (1,323.39 km) |
| Kostanjevica na Krki to Oloron-Sainte-Marie | 809.25 mi (1,302.36 km) |
| Kostanjevica na Krki to Onet Village | 633.32 mi (1,019.23 km) |
| Kostanjevica na Krki to Onnaing | 628.29 mi (1,011.14 km) |
| Kostanjevica na Krki to Orange | 531.51 mi (855.38 km) |
| Kostanjevica na Krki to Orchies | 644.94 mi (1,037.94 km) |
| Kostanjevica na Krki to Orleans | 653.08 mi (1,051.04 km) |
| Kostanjevica na Krki to Orly | 641.72 mi (1,032.74 km) |
| Kostanjevica na Krki to Ormesson-sur-Marne | 635.95 mi (1,023.46 km) |
| Kostanjevica na Krki to Orsay | 650.12 mi (1,046.27 km) |
