| Welby to Popovo | 5,933.09 mi (9,548.39 km) |
| Welby to Provadia | 5,977.16 mi (9,619.31 km) |
| Welby to Radnevo | 5,983.35 mi (9,629.28 km) |
| Welby to Radomir | 5,878.97 mi (9,461.29 km) |
| Welby to Rakitovo | 5,945.14 mi (9,567.78 km) |
| Welby to Rakovski | 5,955.03 mi (9,583.69 km) |
| Welby to Razgrad | 5,930.98 mi (9,544.98 km) |
| Welby to Razlog | 5,931.64 mi (9,546.05 km) |
| Welby to Ruse | 5,898.36 mi (9,492.49 km) |
| Welby to Samokov | 5,909.36 mi (9,510.20 km) |
| Welby to Sandanski | 5,943.26 mi (9,564.75 km) |
| Welby to Sevlievo | 5,918.32 mi (9,524.61 km) |
| Welby to Shumen | 5,957.13 mi (9,587.07 km) |
| Welby to Silistra | 5,919.19 mi (9,526.02 km) |
| Welby to Sliven | 5,973.59 mi (9,613.56 km) |
