| Webster Groves to Popovo | 5,527.10 mi (8,895.01 km) |
| Webster Groves to Provadia | 5,577.85 mi (8,976.68 km) |
| Webster Groves to Radnevo | 5,567.39 mi (8,959.85 km) |
| Webster Groves to Radomir | 5,445.69 mi (8,764.00 km) |
| Webster Groves to Rakitovo | 5,514.71 mi (8,875.07 km) |
| Webster Groves to Rakovski | 5,532.64 mi (8,903.92 km) |
| Webster Groves to Razgrad | 5,528.25 mi (8,896.86 km) |
| Webster Groves to Razlog | 5,496.49 mi (8,845.75 km) |
| Webster Groves to Ruse | 5,494.18 mi (8,842.03 km) |
| Webster Groves to Samokov | 5,478.27 mi (8,816.43 km) |
| Webster Groves to Sandanski | 5,504.51 mi (8,858.66 km) |
| Webster Groves to Sevlievo | 5,502.54 mi (8,855.48 km) |
| Webster Groves to Shumen | 5,555.25 mi (8,940.30 km) |
| Webster Groves to Silistra | 5,525.83 mi (8,892.97 km) |
| Webster Groves to Sliven | 5,563.17 mi (8,953.06 km) |
