| Casper to Devnya | 5,841.02 mi (9,400.22 km) |
| Casper to Dimitrovgrad | 5,854.97 mi (9,422.66 km) |
| Casper to Dobrich | 5,827.60 mi (9,378.62 km) |
| Casper to Dospat | 5,837.10 mi (9,393.91 km) |
| Casper to Dupnitsa | 5,771.61 mi (9,288.51 km) |
| Casper to Elhovo | 5,875.14 mi (9,455.12 km) |
| Casper to Etropole | 5,764.66 mi (9,277.32 km) |
| Casper to Gabrovo | 5,800.35 mi (9,334.76 km) |
| Casper to Gorna Oryahovitsa | 5,795.14 mi (9,326.38 km) |
| Casper to Gotse Delchev | 5,829.28 mi (9,381.31 km) |
| Casper to Harmanli | 5,870.14 mi (9,447.08 km) |
| Casper to Haskovo | 5,860.78 mi (9,432.01 km) |
| Casper to Ihtiman | 5,782.00 mi (9,305.24 km) |
| Casper to Isperih | 5,792.17 mi (9,321.59 km) |
| Casper to Kardzhali | 5,871.49 mi (9,449.24 km) |
