| Obernai to Oestrich-Winkel | 108.79 mi (175.08 km) |
| Obernai to Offenburg | 20.68 mi (33.29 km) |
| Obernai to Oftersheim | 80.29 mi (129.21 km) |
| Obernai to Ohrdruf | 218.76 mi (352.06 km) |
| Obernai to Ohringen | 104.99 mi (168.96 km) |
| Obernai to Olbernhau | 303.12 mi (487.83 km) |
| Obernai to Olching | 177.06 mi (284.95 km) |
| Obernai to Oldenburg | 325.04 mi (523.11 km) |
| Obernai to Oldenburg in Holstein | 429.07 mi (690.52 km) |
| Obernai to Olfen | 224.91 mi (361.95 km) |
| Obernai to Olpe | 177.19 mi (285.17 km) |
| Obernai to Olsberg | 204.44 mi (329.01 km) |
| Obernai to Oranienburg | 389.14 mi (626.27 km) |
| Obernai to Ortenberg | 148.72 mi (239.35 km) |
| Obernai to Oschatz | 317.93 mi (511.66 km) |
