| Northolt to Devnya | 1,416.82 mi (2,280.15 km) |
| Northolt to Dimitrovgrad | 1,382.17 mi (2,224.39 km) |
| Northolt to Dobrich | 1,414.74 mi (2,276.80 km) |
| Northolt to Dospat | 1,341.20 mi (2,158.45 km) |
| Northolt to Dupnitsa | 1,272.60 mi (2,048.05 km) |
| Northolt to Elhovo | 1,416.99 mi (2,280.42 km) |
| Northolt to Etropole | 1,284.43 mi (2,067.10 km) |
| Northolt to Gabrovo | 1,337.74 mi (2,152.89 km) |
| Northolt to Gorna Oryahovitsa | 1,342.29 mi (2,160.20 km) |
| Northolt to Gotse Delchev | 1,327.50 mi (2,136.40 km) |
| Northolt to Harmanli | 1,399.32 mi (2,251.98 km) |
| Northolt to Haskovo | 1,385.71 mi (2,230.09 km) |
| Northolt to Ihtiman | 1,293.41 mi (2,081.54 km) |
| Northolt to Isperih | 1,367.11 mi (2,200.16 km) |
| Northolt to Kardzhali | 1,389.60 mi (2,236.34 km) |
