| Welling to Orbetello | 812.20 mi (1,307.11 km) |
| Welling to Oria | 1,126.65 mi (1,813.16 km) |
| Welling to Oristano | 895.74 mi (1,441.56 km) |
| Welling to Orta Nova | 1,017.09 mi (1,636.85 km) |
| Welling to Orte | 847.35 mi (1,363.68 km) |
| Welling to Ortona | 919.62 mi (1,479.98 km) |
| Welling to Orvieto | 824.67 mi (1,327.17 km) |
| Welling to Orzinuovi | 613.94 mi (988.05 km) |
| Welling to Osimo | 830.66 mi (1,336.82 km) |
| Welling to Ospitaletto | 610.94 mi (983.21 km) |
| Welling to Ostuni | 1,112.94 mi (1,791.10 km) |
| Welling to Ottaviano | 1,001.59 mi (1,611.91 km) |
| Welling to Ovada | 613.60 mi (987.49 km) |
| Welling to Ozieri | 862.61 mi (1,388.24 km) |
| Welling to Paceco | 1,110.15 mi (1,786.61 km) |
