| Smolyan to Oberriet | 843.02 mi (1,356.71 km) |
| Smolyan to Obersiggenthal | 902.75 mi (1,452.84 km) |
| Smolyan to Oberwil | 935.69 mi (1,505.84 km) |
| Smolyan to Oberwingert | 882.77 mi (1,420.69 km) |
| Smolyan to Oftringen | 915.18 mi (1,472.84 km) |
| Smolyan to Olten | 916.69 mi (1,475.26 km) |
| Smolyan to Onex | 976.53 mi (1,571.57 km) |
| Smolyan to Opfikon | 889.45 mi (1,431.43 km) |
| Smolyan to Ostermundigen | 926.34 mi (1,490.80 km) |
| Smolyan to Payerne | 948.76 mi (1,526.88 km) |
| Smolyan to Pfaffikon | 878.34 mi (1,413.55 km) |
| Smolyan to Plan-les-Ouates | 975.50 mi (1,569.92 km) |
| Smolyan to Pratteln | 929.38 mi (1,495.69 km) |
| Smolyan to Prilly | 958.90 mi (1,543.20 km) |
| Smolyan to Pully | 955.54 mi (1,537.80 km) |
