| Saarlouis to Octeville | 377.25 mi (607.12 km) |
| Saarlouis to Oignies | 185.17 mi (298.00 km) |
| Saarlouis to Oissel | 254.75 mi (409.97 km) |
| Saarlouis to Olivet | 243.23 mi (391.45 km) |
| Saarlouis to Ollioules | 428.98 mi (690.37 km) |
| Saarlouis to Olonne-sur-Mer | 438.53 mi (705.75 km) |
| Saarlouis to Oloron-Sainte-Marie | 549.44 mi (884.23 km) |
| Saarlouis to Onet Village | 394.33 mi (634.61 km) |
| Saarlouis to Onnaing | 158.70 mi (255.41 km) |
| Saarlouis to Orange | 369.37 mi (594.44 km) |
| Saarlouis to Orchies | 175.33 mi (282.17 km) |
| Saarlouis to Orleans | 241.72 mi (389.01 km) |
| Saarlouis to Orly | 201.29 mi (323.94 km) |
| Saarlouis to Ormesson-sur-Marne | 194.18 mi (312.51 km) |
| Saarlouis to Orsay | 211.12 mi (339.76 km) |
