| Big Spring to Devnya | 6,309.56 mi (10,154.26 km) |
| Big Spring to Dimitrovgrad | 6,303.10 mi (10,143.85 km) |
| Big Spring to Dobrich | 6,300.09 mi (10,139.01 km) |
| Big Spring to Dospat | 6,273.08 mi (10,095.54 km) |
| Big Spring to Dupnitsa | 6,205.13 mi (9,986.20 km) |
| Big Spring to Elhovo | 6,330.35 mi (10,187.71 km) |
| Big Spring to Etropole | 6,207.88 mi (9,990.62 km) |
| Big Spring to Gabrovo | 6,252.33 mi (10,062.15 km) |
| Big Spring to Gorna Oryahovitsa | 6,251.26 mi (10,060.44 km) |
| Big Spring to Gotse Delchev | 6,261.81 mi (10,077.42 km) |
| Big Spring to Harmanli | 6,319.43 mi (10,170.15 km) |
| Big Spring to Haskovo | 6,307.89 mi (10,151.57 km) |
| Big Spring to Ihtiman | 6,221.26 mi (10,012.15 km) |
| Big Spring to Isperih | 6,259.33 mi (10,073.43 km) |
| Big Spring to Kardzhali | 6,315.34 mi (10,163.57 km) |
