| East Riverdale to Smolyan | 5,011.10 mi (8,064.58 km) |
| East Riverdale to Sofia | 4,908.78 mi (7,899.92 km) |
| East Riverdale to Sopot | 4,968.91 mi (7,996.68 km) |
| East Riverdale to Sozopol | 5,097.76 mi (8,204.05 km) |
| East Riverdale to Sredets | 5,080.58 mi (8,176.40 km) |
| East Riverdale to Stamboliyski | 4,981.42 mi (8,016.82 km) |
| East Riverdale to Stara Zagora | 5,014.50 mi (8,070.06 km) |
| East Riverdale to Svilengrad | 5,064.92 mi (8,151.19 km) |
| East Riverdale to Svishtov | 4,953.12 mi (7,971.28 km) |
| East Riverdale to Targovishte | 5,017.72 mi (8,075.25 km) |
| East Riverdale to Teteven | 4,938.25 mi (7,947.34 km) |
| East Riverdale to Troyan | 4,957.91 mi (7,978.99 km) |
| East Riverdale to Tryavna | 4,990.31 mi (8,031.13 km) |
| East Riverdale to Tutrakan | 4,985.39 mi (8,023.21 km) |
| East Riverdale to Varna | 5,072.05 mi (8,162.68 km) |
