| Kelso to Popovo | 5,971.85 mi (9,610.76 km) |
| Kelso to Provadia | 6,003.77 mi (9,662.13 km) |
| Kelso to Radnevo | 6,034.15 mi (9,711.03 km) |
| Kelso to Radomir | 5,961.13 mi (9,593.52 km) |
| Kelso to Rakitovo | 6,019.54 mi (9,687.52 km) |
| Kelso to Rakovski | 6,016.88 mi (9,683.24 km) |
| Kelso to Razgrad | 5,965.05 mi (9,599.82 km) |
| Kelso to Razlog | 6,013.84 mi (9,678.34 km) |
| Kelso to Ruse | 5,936.32 mi (9,553.58 km) |
| Kelso to Samokov | 5,986.64 mi (9,634.57 km) |
| Kelso to Sandanski | 6,030.27 mi (9,704.79 km) |
| Kelso to Sevlievo | 5,972.30 mi (9,611.49 km) |
| Kelso to Shumen | 5,988.57 mi (9,637.67 km) |
| Kelso to Silistra | 5,940.22 mi (9,559.86 km) |
| Kelso to Sliven | 6,016.69 mi (9,682.93 km) |
