| Idaho Falls to Superior (Colorado) | 431.16 mi (693.88 km) |
| Idaho Falls to Superior (Wisconsin) | 995.32 mi (1,601.81 km) |
| Idaho Falls to Surprise (Arizona) | 677.87 mi (1,090.93 km) |
| Idaho Falls to Susanville (California) | 488.67 mi (786.44 km) |
| Idaho Falls to Sussex (Wisconsin) | 1,193.39 mi (1,920.57 km) |
| Idaho Falls to Suwanee (Georgia) | 1,631.58 mi (2,625.77 km) |
| Idaho Falls to Swansea (Illinois) | 1,194.96 mi (1,923.10 km) |
| Idaho Falls to Sweetwater (Florida) | 2,155.55 mi (3,469.02 km) |
| Idaho Falls to Sweetwater (Texas) | 988.17 mi (1,590.31 km) |
| Idaho Falls to Sycamore (Illinois) | 1,185.63 mi (1,908.09 km) |
| Idaho Falls to Sylacauga (Alabama) | 1,559.17 mi (2,509.24 km) |
| Idaho Falls to Sylvania (Ohio) | 1,438.97 mi (2,315.79 km) |
| Idaho Falls to Syosset (New York) | 1,964.81 mi (3,162.05 km) |
| Idaho Falls to Syracuse (New York) | 1,792.02 mi (2,883.97 km) |
| Idaho Falls to Syracuse (Utah) | 165.92 mi (267.02 km) |
