| Idaho Falls to Popovo | 5,906.59 mi (9,505.74 km) |
| Idaho Falls to Provadia | 5,945.60 mi (9,568.51 km) |
| Idaho Falls to Radnevo | 5,962.63 mi (9,595.93 km) |
| Idaho Falls to Radomir | 5,871.45 mi (9,449.18 km) |
| Idaho Falls to Rakitovo | 5,934.67 mi (9,550.93 km) |
| Idaho Falls to Rakovski | 5,939.02 mi (9,557.93 km) |
| Idaho Falls to Razgrad | 5,902.37 mi (9,498.95 km) |
| Idaho Falls to Razlog | 5,924.55 mi (9,534.65 km) |
| Idaho Falls to Ruse | 5,871.23 mi (9,448.83 km) |
| Idaho Falls to Samokov | 5,899.89 mi (9,494.96 km) |
| Idaho Falls to Sandanski | 5,938.42 mi (9,556.97 km) |
| Idaho Falls to Sevlievo | 5,898.50 mi (9,492.72 km) |
| Idaho Falls to Shumen | 5,927.56 mi (9,539.48 km) |
| Idaho Falls to Silistra | 5,884.68 mi (9,470.48 km) |
| Idaho Falls to Sliven | 5,949.35 mi (9,574.56 km) |
