| Niagara Falls to Devnya | 4,945.89 mi (7,959.64 km) |
| Niagara Falls to Dimitrovgrad | 4,925.77 mi (7,927.26 km) |
| Niagara Falls to Dobrich | 4,939.42 mi (7,949.23 km) |
| Niagara Falls to Dospat | 4,888.76 mi (7,867.70 km) |
| Niagara Falls to Dupnitsa | 4,820.23 mi (7,757.41 km) |
| Niagara Falls to Elhovo | 4,957.21 mi (7,977.86 km) |
| Niagara Falls to Etropole | 4,828.75 mi (7,771.12 km) |
| Niagara Falls to Gabrovo | 4,878.15 mi (7,850.62 km) |
| Niagara Falls to Gorna Oryahovitsa | 4,879.84 mi (7,853.34 km) |
| Niagara Falls to Gotse Delchev | 4,875.66 mi (7,846.61 km) |
| Niagara Falls to Harmanli | 4,942.62 mi (7,954.38 km) |
| Niagara Falls to Haskovo | 4,929.86 mi (7,933.84 km) |
| Niagara Falls to Ihtiman | 4,839.53 mi (7,788.47 km) |
| Niagara Falls to Isperih | 4,895.44 mi (7,878.45 km) |
| Niagara Falls to Kardzhali | 4,935.21 mi (7,942.45 km) |
