| Riga to Smolyan | 1,061.99 mi (1,709.10 km) |
| Riga to Sofia | 985.10 mi (1,585.36 km) |
| Riga to Sopot | 988.36 mi (1,590.62 km) |
| Riga to Sozopol | 1,016.49 mi (1,635.89 km) |
| Riga to Sredets | 1,017.87 mi (1,638.10 km) |
| Riga to Stamboliyski | 1,023.83 mi (1,647.70 km) |
| Riga to Stara Zagora | 1,005.24 mi (1,617.77 km) |
| Riga to Svilengrad | 1,053.09 mi (1,694.78 km) |
| Riga to Svishtov | 922.76 mi (1,485.04 km) |
| Riga to Targovishte | 952.69 mi (1,533.20 km) |
| Riga to Teteven | 969.56 mi (1,560.35 km) |
| Riga to Troyan | 972.21 mi (1,564.62 km) |
| Riga to Tryavna | 974.89 mi (1,568.94 km) |
| Riga to Tutrakan | 897.87 mi (1,444.99 km) |
| Riga to Varna | 963.35 mi (1,550.35 km) |
