| Radolfzell am Bodensee to Oria | 658.39 mi (1,059.57 km) |
| Radolfzell am Bodensee to Oristano | 541.15 mi (870.90 km) |
| Radolfzell am Bodensee to Orta Nova | 552.75 mi (889.57 km) |
| Radolfzell am Bodensee to Orte | 400.58 mi (644.68 km) |
| Radolfzell am Bodensee to Ortona | 456.59 mi (734.81 km) |
| Radolfzell am Bodensee to Orvieto | 378.69 mi (609.44 km) |
| Radolfzell am Bodensee to Orzinuovi | 167.62 mi (269.76 km) |
| Radolfzell am Bodensee to Osimo | 365.77 mi (588.64 km) |
| Radolfzell am Bodensee to Ospitaletto | 159.37 mi (256.49 km) |
| Radolfzell am Bodensee to Ostuni | 644.08 mi (1,036.55 km) |
| Radolfzell am Bodensee to Ottaviano | 547.81 mi (881.61 km) |
| Radolfzell am Bodensee to Ovada | 214.33 mi (344.93 km) |
| Radolfzell am Bodensee to Ozieri | 493.91 mi (794.87 km) |
| Radolfzell am Bodensee to Paceco | 697.47 mi (1,122.47 km) |
| Radolfzell am Bodensee to Pachino | 822.66 mi (1,323.94 km) |
