| Bad Honnef am Rhein to Oria | 861.14 mi (1,385.88 km) |
| Bad Honnef am Rhein to Oristano | 744.93 mi (1,198.85 km) |
| Bad Honnef am Rhein to Orta Nova | 760.50 mi (1,223.91 km) |
| Bad Honnef am Rhein to Orte | 615.98 mi (991.32 km) |
| Bad Honnef am Rhein to Ortona | 666.27 mi (1,072.26 km) |
| Bad Honnef am Rhein to Orvieto | 594.26 mi (956.37 km) |
| Bad Honnef am Rhein to Orzinuovi | 383.30 mi (616.86 km) |
| Bad Honnef am Rhein to Osimo | 575.33 mi (925.91 km) |
| Bad Honnef am Rhein to Ospitaletto | 375.32 mi (604.01 km) |
| Bad Honnef am Rhein to Ostuni | 846.12 mi (1,361.69 km) |
| Bad Honnef am Rhein to Ottaviano | 760.86 mi (1,224.48 km) |
| Bad Honnef am Rhein to Ovada | 420.17 mi (676.19 km) |
| Bad Honnef am Rhein to Ozieri | 700.31 mi (1,127.04 km) |
| Bad Honnef am Rhein to Paceco | 912.95 mi (1,469.25 km) |
| Bad Honnef am Rhein to Pachino | 1,038.23 mi (1,670.86 km) |
