| Caldwell to Popovo | 6,003.99 mi (9,662.48 km) |
| Caldwell to Provadia | 6,040.40 mi (9,721.09 km) |
| Caldwell to Radnevo | 6,062.52 mi (9,756.68 km) |
| Caldwell to Radomir | 5,977.92 mi (9,620.53 km) |
| Caldwell to Rakitovo | 6,039.49 mi (9,719.63 km) |
| Caldwell to Rakovski | 6,041.24 mi (9,722.43 km) |
| Caldwell to Razgrad | 5,998.78 mi (9,654.11 km) |
| Caldwell to Razlog | 6,031.00 mi (9,705.96 km) |
| Caldwell to Ruse | 5,968.48 mi (9,605.34 km) |
| Caldwell to Samokov | 6,005.34 mi (9,664.66 km) |
| Caldwell to Sandanski | 6,045.85 mi (9,729.86 km) |
| Caldwell to Sevlievo | 5,999.10 mi (9,654.61 km) |
| Caldwell to Shumen | 6,023.40 mi (9,693.72 km) |
| Caldwell to Silistra | 5,978.34 mi (9,621.22 km) |
| Caldwell to Sliven | 6,047.64 mi (9,732.73 km) |
