| Helensburgh to Devnya | 1,672.08 mi (2,690.96 km) |
| Helensburgh to Dimitrovgrad | 1,657.55 mi (2,667.57 km) |
| Helensburgh to Dobrich | 1,665.43 mi (2,680.25 km) |
| Helensburgh to Dospat | 1,627.12 mi (2,618.60 km) |
| Helensburgh to Dupnitsa | 1,559.37 mi (2,509.56 km) |
| Helensburgh to Elhovo | 1,686.40 mi (2,713.99 km) |
| Helensburgh to Etropole | 1,561.89 mi (2,513.62 km) |
| Helensburgh to Gabrovo | 1,607.80 mi (2,587.50 km) |
| Helensburgh to Gorna Oryahovitsa | 1,608.09 mi (2,587.96 km) |
| Helensburgh to Gotse Delchev | 1,616.29 mi (2,601.17 km) |
| Helensburgh to Harmanli | 1,674.05 mi (2,694.12 km) |
| Helensburgh to Haskovo | 1,662.18 mi (2,675.02 km) |
| Helensburgh to Ihtiman | 1,575.10 mi (2,534.88 km) |
| Helensburgh to Isperih | 1,621.63 mi (2,609.75 km) |
| Helensburgh to Kardzhali | 1,669.28 mi (2,686.45 km) |
