| Clayton to Popovo | 1,457.21 mi (2,345.16 km) |
| Clayton to Provadia | 1,511.21 mi (2,432.06 km) |
| Clayton to Radnevo | 1,492.85 mi (2,402.51 km) |
| Clayton to Radomir | 1,368.75 mi (2,202.80 km) |
| Clayton to Rakitovo | 1,437.79 mi (2,313.90 km) |
| Clayton to Rakovski | 1,456.60 mi (2,344.18 km) |
| Clayton to Razgrad | 1,460.22 mi (2,350.00 km) |
| Clayton to Razlog | 1,419.66 mi (2,284.72 km) |
| Clayton to Ruse | 1,425.76 mi (2,294.54 km) |
| Clayton to Samokov | 1,401.35 mi (2,255.25 km) |
| Clayton to Sandanski | 1,428.10 mi (2,298.31 km) |
| Clayton to Sevlievo | 1,428.48 mi (2,298.92 km) |
| Clayton to Shumen | 1,487.35 mi (2,393.65 km) |
| Clayton to Silistra | 1,464.43 mi (2,356.77 km) |
| Clayton to Sliven | 1,490.74 mi (2,399.12 km) |
