| Williamstown to Popovo | 4,888.89 mi (7,867.91 km) |
| Williamstown to Provadia | 4,943.91 mi (7,956.46 km) |
| Williamstown to Radnevo | 4,920.39 mi (7,918.60 km) |
| Williamstown to Radomir | 4,787.46 mi (7,704.67 km) |
| Williamstown to Rakitovo | 4,857.36 mi (7,817.16 km) |
| Williamstown to Rakovski | 4,881.26 mi (7,855.63 km) |
| Williamstown to Razgrad | 4,892.63 mi (7,873.93 km) |
| Williamstown to Razlog | 4,835.79 mi (7,782.46 km) |
| Williamstown to Ruse | 4,858.12 mi (7,818.39 km) |
| Williamstown to Samokov | 4,821.12 mi (7,758.84 km) |
| Williamstown to Sandanski | 4,840.86 mi (7,790.61 km) |
| Williamstown to Sevlievo | 4,857.01 mi (7,816.61 km) |
| Williamstown to Shumen | 4,919.73 mi (7,917.54 km) |
| Williamstown to Silistra | 4,897.84 mi (7,882.31 km) |
| Williamstown to Sliven | 4,920.67 mi (7,919.05 km) |
