| Riverton to Smolyan | 6,148.66 mi (9,895.31 km) |
| Riverton to Sofia | 6,046.07 mi (9,730.21 km) |
| Riverton to Sopot | 6,087.12 mi (9,796.27 km) |
| Riverton to Sozopol | 6,177.14 mi (9,941.15 km) |
| Riverton to Sredets | 6,168.53 mi (9,927.29 km) |
| Riverton to Stamboliyski | 6,111.78 mi (9,835.96 km) |
| Riverton to Stara Zagora | 6,123.62 mi (9,855.02 km) |
| Riverton to Svilengrad | 6,177.62 mi (9,941.92 km) |
| Riverton to Svishtov | 6,045.71 mi (9,729.62 km) |
| Riverton to Targovishte | 6,099.04 mi (9,815.46 km) |
| Riverton to Teteven | 6,058.58 mi (9,750.35 km) |
| Riverton to Troyan | 6,072.48 mi (9,772.72 km) |
| Riverton to Tryavna | 6,094.00 mi (9,807.35 km) |
| Riverton to Tutrakan | 6,052.13 mi (9,739.95 km) |
| Riverton to Varna | 6,134.38 mi (9,872.34 km) |
