| Aiken to Popovo | 5,452.50 mi (8,774.95 km) |
| Aiken to Provadia | 5,507.90 mi (8,864.11 km) |
| Aiken to Radnevo | 5,482.95 mi (8,823.95 km) |
| Aiken to Radomir | 5,348.64 mi (8,607.80 km) |
| Aiken to Rakitovo | 5,418.57 mi (8,720.35 km) |
| Aiken to Rakovski | 5,443.30 mi (8,760.14 km) |
| Aiken to Razgrad | 5,456.51 mi (8,781.40 km) |
| Aiken to Razlog | 5,396.52 mi (8,684.86 km) |
| Aiken to Ruse | 5,421.99 mi (8,725.84 km) |
| Aiken to Samokov | 5,382.41 mi (8,662.16 km) |
| Aiken to Sandanski | 5,401.09 mi (8,692.21 km) |
| Aiken to Sevlievo | 5,419.84 mi (8,722.39 km) |
| Aiken to Shumen | 5,483.59 mi (8,824.98 km) |
| Aiken to Silistra | 5,462.40 mi (8,790.88 km) |
| Aiken to Sliven | 5,483.77 mi (8,825.28 km) |
