| Constanta to Oberriet | 942.21 mi (1,516.35 km) |
| Constanta to Obersiggenthal | 1,002.71 mi (1,613.71 km) |
| Constanta to Oberwil | 1,037.16 mi (1,669.15 km) |
| Constanta to Oberwingert | 980.79 mi (1,578.44 km) |
| Constanta to Oftringen | 1,019.13 mi (1,640.13 km) |
| Constanta to Olten | 1,020.10 mi (1,641.69 km) |
| Constanta to Onex | 1,102.56 mi (1,774.39 km) |
| Constanta to Opfikon | 989.58 mi (1,592.57 km) |
| Constanta to Ostermundigen | 1,037.50 mi (1,669.70 km) |
| Constanta to Payerne | 1,063.33 mi (1,711.26 km) |
| Constanta to Pfaffikon | 979.04 mi (1,575.61 km) |
| Constanta to Plan-les-Ouates | 1,101.77 mi (1,773.14 km) |
| Constanta to Pratteln | 1,030.42 mi (1,658.30 km) |
| Constanta to Prilly | 1,078.67 mi (1,735.95 km) |
| Constanta to Pully | 1,075.48 mi (1,730.82 km) |
