| Adelphi to Popovo | 4,999.78 mi (8,046.37 km) |
| Adelphi to Provadia | 5,054.55 mi (8,134.51 km) |
| Adelphi to Radnevo | 5,031.88 mi (8,098.03 km) |
| Adelphi to Radomir | 4,899.60 mi (7,885.14 km) |
| Adelphi to Rakitovo | 4,969.48 mi (7,997.61 km) |
| Adelphi to Rakovski | 4,993.02 mi (8,035.48 km) |
| Adelphi to Razgrad | 5,003.35 mi (8,052.11 km) |
| Adelphi to Razlog | 4,948.11 mi (7,963.22 km) |
| Adelphi to Ruse | 4,968.85 mi (7,996.59 km) |
| Adelphi to Samokov | 4,933.21 mi (7,939.23 km) |
| Adelphi to Sandanski | 4,953.36 mi (7,971.66 km) |
| Adelphi to Sevlievo | 4,968.38 mi (7,995.83 km) |
| Adelphi to Shumen | 5,030.46 mi (8,095.74 km) |
| Adelphi to Silistra | 5,008.03 mi (8,059.65 km) |
| Adelphi to Sliven | 5,031.87 mi (8,098.00 km) |
