| Caister-on-Sea to Popovo | 1,293.02 mi (2,080.92 km) |
| Caister-on-Sea to Provadia | 1,347.60 mi (2,168.76 km) |
| Caister-on-Sea to Radnevo | 1,327.61 mi (2,136.58 km) |
| Caister-on-Sea to Radomir | 1,202.68 mi (1,935.52 km) |
| Caister-on-Sea to Rakitovo | 1,271.78 mi (2,046.72 km) |
| Caister-on-Sea to Rakovski | 1,290.97 mi (2,077.62 km) |
| Caister-on-Sea to Razgrad | 1,296.41 mi (2,086.37 km) |
| Caister-on-Sea to Razlog | 1,253.51 mi (2,017.34 km) |
| Caister-on-Sea to Ruse | 1,261.91 mi (2,030.85 km) |
| Caister-on-Sea to Samokov | 1,235.33 mi (1,988.07 km) |
| Caister-on-Sea to Sandanski | 1,261.90 mi (2,030.83 km) |
| Caister-on-Sea to Sevlievo | 1,263.39 mi (2,033.23 km) |
| Caister-on-Sea to Shumen | 1,323.52 mi (2,130.00 km) |
| Caister-on-Sea to Silistra | 1,301.89 mi (2,095.18 km) |
| Caister-on-Sea to Sliven | 1,325.99 mi (2,133.97 km) |
