| Bad Honnef am Rhein to Oestrich-Winkel | 56.12 mi (90.31 km) |
| Bad Honnef am Rhein to Offenburg | 153.80 mi (247.51 km) |
| Bad Honnef am Rhein to Oftersheim | 106.71 mi (171.74 km) |
| Bad Honnef am Rhein to Ohrdruf | 153.81 mi (247.54 km) |
| Bad Honnef am Rhein to Ohringen | 142.09 mi (228.67 km) |
| Bad Honnef am Rhein to Olbernhau | 267.41 mi (430.36 km) |
| Bad Honnef am Rhein to Olching | 249.58 mi (401.66 km) |
| Bad Honnef am Rhein to Oldenburg | 177.71 mi (285.99 km) |
| Bad Honnef am Rhein to Oldenburg in Holstein | 295.64 mi (475.78 km) |
| Bad Honnef am Rhein to Olfen | 74.36 mi (119.67 km) |
| Bad Honnef am Rhein to Olpe | 36.88 mi (59.35 km) |
| Bad Honnef am Rhein to Olsberg | 73.19 mi (117.79 km) |
| Bad Honnef am Rhein to Oranienburg | 295.63 mi (475.77 km) |
| Bad Honnef am Rhein to Ortenberg | 82.80 mi (133.25 km) |
| Bad Honnef am Rhein to Oschatz | 259.74 mi (418.01 km) |
