| Towson to Popovo | 4,967.88 mi (7,995.02 km) |
| Towson to Provadia | 5,022.59 mi (8,083.07 km) |
| Towson to Radnevo | 5,000.12 mi (8,046.92 km) |
| Towson to Radomir | 4,868.02 mi (7,834.32 km) |
| Towson to Rakitovo | 4,937.89 mi (7,946.77 km) |
| Towson to Rakovski | 4,961.32 mi (7,984.48 km) |
| Towson to Razgrad | 4,971.41 mi (8,000.71 km) |
| Towson to Razlog | 4,916.58 mi (7,912.48 km) |
| Towson to Ruse | 4,936.91 mi (7,945.18 km) |
| Towson to Samokov | 4,901.61 mi (7,888.38 km) |
| Towson to Sandanski | 4,921.89 mi (7,921.01 km) |
| Towson to Sevlievo | 4,936.58 mi (7,944.66 km) |
| Towson to Shumen | 4,998.52 mi (8,044.34 km) |
| Towson to Silistra | 4,975.98 mi (8,008.07 km) |
| Towson to Sliven | 5,000.03 mi (8,046.77 km) |
