| Buckeye to Popovo | 6,531.26 mi (10,511.05 km) |
| Buckeye to Provadia | 6,573.78 mi (10,579.47 km) |
| Buckeye to Radnevo | 6,583.33 mi (10,594.84 km) |
| Buckeye to Radomir | 6,482.41 mi (10,432.43 km) |
| Buckeye to Rakitovo | 6,547.90 mi (10,537.83 km) |
| Buckeye to Rakovski | 6,556.31 mi (10,551.37 km) |
| Buckeye to Razgrad | 6,528.48 mi (10,506.58 km) |
| Buckeye to Razlog | 6,535.25 mi (10,517.47 km) |
| Buckeye to Ruse | 6,496.29 mi (10,454.76 km) |
| Buckeye to Samokov | 6,512.34 mi (10,480.60 km) |
| Buckeye to Sandanski | 6,547.44 mi (10,537.09 km) |
| Buckeye to Sevlievo | 6,518.47 mi (10,490.47 km) |
| Buckeye to Shumen | 6,554.36 mi (10,548.23 km) |
| Buckeye to Silistra | 6,514.75 mi (10,484.48 km) |
| Buckeye to Sliven | 6,572.50 mi (10,577.42 km) |
