| Kaiserslautern to Popovo | 971.99 mi (1,564.27 km) |
| Kaiserslautern to Provadia | 1,029.34 mi (1,656.57 km) |
| Kaiserslautern to Radnevo | 999.91 mi (1,609.20 km) |
| Kaiserslautern to Radomir | 868.09 mi (1,397.06 km) |
| Kaiserslautern to Rakitovo | 937.80 mi (1,509.24 km) |
| Kaiserslautern to Rakovski | 960.54 mi (1,545.83 km) |
| Kaiserslautern to Razgrad | 977.45 mi (1,573.05 km) |
| Kaiserslautern to Razlog | 917.72 mi (1,476.93 km) |
| Kaiserslautern to Ruse | 943.03 mi (1,517.66 km) |
| Kaiserslautern to Samokov | 901.41 mi (1,450.68 km) |
| Kaiserslautern to Sandanski | 924.70 mi (1,488.16 km) |
| Kaiserslautern to Sevlievo | 937.02 mi (1,507.99 km) |
| Kaiserslautern to Shumen | 1,004.30 mi (1,616.27 km) |
| Kaiserslautern to Silistra | 989.42 mi (1,592.32 km) |
| Kaiserslautern to Sliven | 1,001.42 mi (1,611.62 km) |
