| Sliven to Oberriet | 877.30 mi (1,411.88 km) |
| Sliven to Obersiggenthal | 937.93 mi (1,509.46 km) |
| Sliven to Oberwil | 971.82 mi (1,564.00 km) |
| Sliven to Oberwingert | 916.90 mi (1,475.61 km) |
| Sliven to Oftringen | 952.26 mi (1,532.52 km) |
| Sliven to Olten | 953.54 mi (1,534.58 km) |
| Sliven to Onex | 1,024.06 mi (1,648.06 km) |
| Sliven to Opfikon | 924.59 mi (1,487.98 km) |
| Sliven to Ostermundigen | 966.77 mi (1,555.87 km) |
| Sliven to Payerne | 990.90 mi (1,594.71 km) |
| Sliven to Pfaffikon | 913.64 mi (1,470.36 km) |
| Sliven to Plan-les-Ouates | 1,023.14 mi (1,646.58 km) |
| Sliven to Pratteln | 965.27 mi (1,553.45 km) |
| Sliven to Prilly | 1,003.47 mi (1,614.93 km) |
| Sliven to Pully | 1,000.17 mi (1,609.61 km) |
