| Harrow on the Hill to Popovo | 1,354.76 mi (2,180.27 km) |
| Harrow on the Hill to Provadia | 1,411.26 mi (2,271.20 km) |
| Harrow on the Hill to Radnevo | 1,384.31 mi (2,227.83 km) |
| Harrow on the Hill to Radomir | 1,252.65 mi (2,015.94 km) |
| Harrow on the Hill to Rakitovo | 1,322.40 mi (2,128.20 km) |
| Harrow on the Hill to Rakovski | 1,345.22 mi (2,164.92 km) |
| Harrow on the Hill to Razgrad | 1,359.53 mi (2,187.95 km) |
| Harrow on the Hill to Razlog | 1,302.00 mi (2,095.37 km) |
| Harrow on the Hill to Ruse | 1,325.03 mi (2,132.43 km) |
| Harrow on the Hill to Samokov | 1,286.04 mi (2,069.68 km) |
| Harrow on the Hill to Sandanski | 1,308.50 mi (2,105.83 km) |
| Harrow on the Hill to Sevlievo | 1,321.14 mi (2,126.17 km) |
| Harrow on the Hill to Shumen | 1,386.51 mi (2,231.38 km) |
| Harrow on the Hill to Silistra | 1,368.96 mi (2,203.13 km) |
| Harrow on the Hill to Sliven | 1,385.20 mi (2,229.26 km) |
