| Rehlingen-Siersburg to Oria | 812.31 mi (1,307.29 km) |
| Rehlingen-Siersburg to Oristano | 660.49 mi (1,062.95 km) |
| Rehlingen-Siersburg to Orta Nova | 706.62 mi (1,137.19 km) |
| Rehlingen-Siersburg to Orte | 550.17 mi (885.42 km) |
| Rehlingen-Siersburg to Ortona | 610.23 mi (982.06 km) |
| Rehlingen-Siersburg to Orvieto | 527.87 mi (849.52 km) |
| Rehlingen-Siersburg to Orzinuovi | 313.57 mi (504.64 km) |
| Rehlingen-Siersburg to Osimo | 519.53 mi (836.11 km) |
| Rehlingen-Siersburg to Ospitaletto | 307.44 mi (494.77 km) |
| Rehlingen-Siersburg to Ostuni | 797.95 mi (1,284.18 km) |
| Rehlingen-Siersburg to Ottaviano | 699.90 mi (1,126.39 km) |
| Rehlingen-Siersburg to Ovada | 339.64 mi (546.59 km) |
| Rehlingen-Siersburg to Ozieri | 617.36 mi (993.54 km) |
| Rehlingen-Siersburg to Paceco | 838.93 mi (1,350.13 km) |
| Rehlingen-Siersburg to Pachino | 970.66 mi (1,562.13 km) |
