| Alfter to Oestrich-Winkel | 67.01 mi (107.84 km) |
| Alfter to Offenburg | 162.13 mi (260.93 km) |
| Alfter to Oftersheim | 117.38 mi (188.91 km) |
| Alfter to Ohrdruf | 162.78 mi (261.96 km) |
| Alfter to Ohringen | 153.32 mi (246.74 km) |
| Alfter to Olbernhau | 276.71 mi (445.32 km) |
| Alfter to Olching | 260.88 mi (419.85 km) |
| Alfter to Oldenburg | 174.12 mi (280.22 km) |
| Alfter to Oldenburg in Holstein | 295.17 mi (475.03 km) |
| Alfter to Olfen | 69.69 mi (112.16 km) |
| Alfter to Olpe | 40.84 mi (65.73 km) |
| Alfter to Olsberg | 76.83 mi (123.64 km) |
| Alfter to Oranienburg | 300.58 mi (483.74 km) |
| Alfter to Ortenberg | 93.59 mi (150.61 km) |
| Alfter to Oschatz | 267.83 mi (431.02 km) |
