| Paducah to Popovo | 5,543.25 mi (8,921.00 km) |
| Paducah to Provadia | 5,595.20 mi (9,004.60 km) |
| Paducah to Radnevo | 5,581.29 mi (8,982.21 km) |
| Paducah to Radomir | 5,456.34 mi (8,781.13 km) |
| Paducah to Rakitovo | 5,525.72 mi (8,892.78 km) |
| Paducah to Rakovski | 5,545.30 mi (8,924.30 km) |
| Paducah to Razgrad | 5,545.07 mi (8,923.93 km) |
| Paducah to Razlog | 5,506.54 mi (8,861.93 km) |
| Paducah to Ruse | 5,510.83 mi (8,868.82 km) |
| Paducah to Samokov | 5,489.27 mi (8,834.13 km) |
| Paducah to Sandanski | 5,513.76 mi (8,873.54 km) |
| Paducah to Sevlievo | 5,516.72 mi (8,878.30 km) |
| Paducah to Shumen | 5,572.15 mi (8,967.50 km) |
| Paducah to Silistra | 5,544.61 mi (8,923.19 km) |
| Paducah to Sliven | 5,578.26 mi (8,977.34 km) |
