| Flensburg to Popovo | 1,090.92 mi (1,755.66 km) |
| Flensburg to Provadia | 1,137.43 mi (1,830.51 km) |
| Flensburg to Radnevo | 1,140.22 mi (1,835.01 km) |
| Flensburg to Radomir | 1,042.34 mi (1,677.48 km) |
| Flensburg to Rakitovo | 1,106.03 mi (1,779.98 km) |
| Flensburg to Rakovski | 1,112.86 mi (1,790.97 km) |
| Flensburg to Razgrad | 1,089.74 mi (1,753.77 km) |
| Flensburg to Razlog | 1,095.44 mi (1,762.94 km) |
| Flensburg to Ruse | 1,056.57 mi (1,700.38 km) |
| Flensburg to Samokov | 1,071.00 mi (1,723.60 km) |
| Flensburg to Sandanski | 1,109.43 mi (1,785.45 km) |
| Flensburg to Sevlievo | 1,075.23 mi (1,730.41 km) |
| Flensburg to Shumen | 1,116.28 mi (1,796.49 km) |
| Flensburg to Silistra | 1,082.37 mi (1,741.91 km) |
| Flensburg to Sliven | 1,130.69 mi (1,819.68 km) |
