| Richland to Smolyan | 5,974.71 mi (9,615.37 km) |
| Richland to Sofia | 5,875.42 mi (9,455.58 km) |
| Richland to Sopot | 5,908.43 mi (9,508.71 km) |
| Richland to Sozopol | 5,982.16 mi (9,627.36 km) |
| Richland to Sredets | 5,976.74 mi (9,618.63 km) |
| Richland to Stamboliyski | 5,936.52 mi (9,553.90 km) |
| Richland to Stara Zagora | 5,940.58 mi (9,560.44 km) |
| Richland to Svilengrad | 5,994.03 mi (9,646.46 km) |
| Richland to Svishtov | 5,859.58 mi (9,430.08 km) |
| Richland to Targovishte | 5,907.31 mi (9,506.89 km) |
| Richland to Teteven | 5,881.59 mi (9,465.50 km) |
| Richland to Troyan | 5,893.02 mi (9,483.91 km) |
| Richland to Tryavna | 5,910.07 mi (9,511.34 km) |
| Richland to Tutrakan | 5,857.03 mi (9,425.98 km) |
| Richland to Varna | 5,935.08 mi (9,551.58 km) |
