| Grefrath to Devnya | 1,136.29 mi (1,828.69 km) |
| Grefrath to Dimitrovgrad | 1,110.22 mi (1,786.73 km) |
| Grefrath to Dobrich | 1,132.72 mi (1,822.94 km) |
| Grefrath to Dospat | 1,075.36 mi (1,730.62 km) |
| Grefrath to Dupnitsa | 1,007.15 mi (1,620.85 km) |
| Grefrath to Elhovo | 1,142.16 mi (1,838.13 km) |
| Grefrath to Etropole | 1,013.31 mi (1,630.76 km) |
| Grefrath to Gabrovo | 1,062.98 mi (1,710.70 km) |
| Grefrath to Gorna Oryahovitsa | 1,065.60 mi (1,714.91 km) |
| Grefrath to Gotse Delchev | 1,063.56 mi (1,711.64 km) |
| Grefrath to Harmanli | 1,127.07 mi (1,813.85 km) |
| Grefrath to Haskovo | 1,114.35 mi (1,793.37 km) |
| Grefrath to Ihtiman | 1,024.77 mi (1,649.21 km) |
| Grefrath to Isperih | 1,086.17 mi (1,748.03 km) |
| Grefrath to Kardzhali | 1,120.05 mi (1,802.54 km) |
