| Unterwellenborn to Popovo | 858.10 mi (1,380.99 km) |
| Unterwellenborn to Provadia | 911.43 mi (1,466.81 km) |
| Unterwellenborn to Radnevo | 896.62 mi (1,442.98 km) |
| Unterwellenborn to Radomir | 780.77 mi (1,256.53 km) |
| Unterwellenborn to Rakitovo | 848.17 mi (1,365.00 km) |
| Unterwellenborn to Rakovski | 862.76 mi (1,388.48 km) |
| Unterwellenborn to Razgrad | 860.64 mi (1,385.06 km) |
| Unterwellenborn to Razlog | 833.10 mi (1,340.75 km) |
| Unterwellenborn to Ruse | 826.22 mi (1,329.68 km) |
| Unterwellenborn to Samokov | 812.00 mi (1,306.79 km) |
| Unterwellenborn to Sandanski | 844.20 mi (1,358.61 km) |
| Unterwellenborn to Sevlievo | 831.76 mi (1,338.59 km) |
| Unterwellenborn to Shumen | 887.76 mi (1,428.70 km) |
| Unterwellenborn to Silistra | 864.43 mi (1,391.17 km) |
| Unterwellenborn to Sliven | 892.80 mi (1,436.83 km) |
