| Sliema to Oerlinghausen | 1,145.72 mi (1,843.85 km) |
| Sliema to Oestrich-Winkel | 1,026.45 mi (1,651.92 km) |
| Sliema to Offenburg | 929.50 mi (1,495.88 km) |
| Sliema to Oftersheim | 976.57 mi (1,571.64 km) |
| Sliema to Ohrdruf | 1,047.49 mi (1,685.78 km) |
| Sliema to Ohringen | 952.22 mi (1,532.45 km) |
| Sliema to Olbernhau | 1,021.10 mi (1,643.30 km) |
| Sliema to Olching | 864.40 mi (1,391.12 km) |
| Sliema to Oldenburg | 1,229.08 mi (1,978.01 km) |
| Sliema to Oldenburg in Holstein | 1,282.26 mi (2,063.60 km) |
| Sliema to Olfen | 1,146.90 mi (1,845.75 km) |
| Sliema to Olpe | 1,094.80 mi (1,761.91 km) |
| Sliema to Olsberg | 1,107.39 mi (1,782.17 km) |
| Sliema to Oranienburg | 1,165.32 mi (1,875.40 km) |
| Sliema to Ortenberg | 1,034.37 mi (1,664.65 km) |
