| Castlebar to Devnya | 1,813.86 mi (2,919.12 km) |
| Castlebar to Dimitrovgrad | 1,784.83 mi (2,872.41 km) |
| Castlebar to Dobrich | 1,810.20 mi (2,913.23 km) |
| Castlebar to Dospat | 1,745.85 mi (2,809.68 km) |
| Castlebar to Dupnitsa | 1,677.29 mi (2,699.33 km) |
| Castlebar to Elhovo | 1,818.25 mi (2,926.19 km) |
| Castlebar to Etropole | 1,687.35 mi (2,715.53 km) |
| Castlebar to Gabrovo | 1,738.98 mi (2,798.62 km) |
| Castlebar to Gorna Oryahovitsa | 1,742.37 mi (2,804.08 km) |
| Castlebar to Gotse Delchev | 1,732.57 mi (2,788.30 km) |
| Castlebar to Harmanli | 1,801.86 mi (2,899.81 km) |
| Castlebar to Haskovo | 1,788.62 mi (2,878.51 km) |
| Castlebar to Ihtiman | 1,697.23 mi (2,731.42 km) |
| Castlebar to Isperih | 1,763.74 mi (2,838.47 km) |
| Castlebar to Kardzhali | 1,793.20 mi (2,885.88 km) |
