| Heerlen to Devnya | 1,140.00 mi (1,834.65 km) |
| Heerlen to Dimitrovgrad | 1,109.98 mi (1,786.35 km) |
| Heerlen to Dobrich | 1,137.28 mi (1,830.27 km) |
| Heerlen to Dospat | 1,072.85 mi (1,726.59 km) |
| Heerlen to Dupnitsa | 1,004.43 mi (1,616.48 km) |
| Heerlen to Elhovo | 1,143.13 mi (1,839.69 km) |
| Heerlen to Etropole | 1,012.66 mi (1,629.73 km) |
| Heerlen to Gabrovo | 1,063.86 mi (1,712.12 km) |
| Heerlen to Gorna Oryahovitsa | 1,067.35 mi (1,717.73 km) |
| Heerlen to Gotse Delchev | 1,060.41 mi (1,706.57 km) |
| Heerlen to Harmanli | 1,126.96 mi (1,813.67 km) |
| Heerlen to Haskovo | 1,113.89 mi (1,792.63 km) |
| Heerlen to Ihtiman | 1,023.20 mi (1,646.68 km) |
| Heerlen to Isperih | 1,090.09 mi (1,754.33 km) |
| Heerlen to Kardzhali | 1,118.90 mi (1,800.70 km) |
