| Boise to Superior (Colorado) | 623.63 mi (1,003.63 km) |
| Boise to Superior (Wisconsin) | 1,191.12 mi (1,916.92 km) |
| Boise to Surprise (Arizona) | 714.83 mi (1,150.40 km) |
| Boise to Susanville (California) | 314.38 mi (505.94 km) |
| Boise to Sussex (Wisconsin) | 1,400.48 mi (2,253.86 km) |
| Boise to Suwanee (Georgia) | 1,838.64 mi (2,959.00 km) |
| Boise to Swansea (Illinois) | 1,404.34 mi (2,260.07 km) |
| Boise to Sweetwater (Florida) | 2,353.39 mi (3,787.41 km) |
| Boise to Sweetwater (Texas) | 1,150.84 mi (1,852.10 km) |
| Boise to Sycamore (Illinois) | 1,394.62 mi (2,244.42 km) |
| Boise to Sylacauga (Alabama) | 1,763.08 mi (2,837.41 km) |
| Boise to Sylvania (Ohio) | 1,647.14 mi (2,650.81 km) |
| Boise to Syosset (New York) | 2,171.06 mi (3,493.98 km) |
| Boise to Syracuse (New York) | 1,995.61 mi (3,211.63 km) |
| Boise to Syracuse (Utah) | 274.42 mi (441.64 km) |
