| Boise to Southern Pines (North Carolina) | 2,031.79 mi (3,269.85 km) |
| Boise to Southfield (Michigan) | 1,655.85 mi (2,664.84 km) |
| Boise to Southgate (Michigan) | 1,663.21 mi (2,676.68 km) |
| Boise to Southlake (Texas) | 1,264.69 mi (2,035.32 km) |
| Boise to Spanaway (Washington) | 385.55 mi (620.49 km) |
| Boise to Spanish Fork (Utah) | 337.48 mi (543.12 km) |
| Boise to Spanish Lake (Missouri) | 1,387.00 mi (2,232.16 km) |
| Boise to Spanish Springs (Nevada) | 325.17 mi (523.32 km) |
| Boise to Sparks (Nevada) | 331.37 mi (533.29 km) |
| Boise to Spartanburg (South Carolina) | 1,914.29 mi (3,080.74 km) |
| Boise to Spearfish (South Dakota) | 619.04 mi (996.25 km) |
| Boise to Speedway (Indiana) | 1,560.25 mi (2,510.99 km) |
| Boise to Spencer (Iowa) | 1,056.20 mi (1,699.79 km) |
| Boise to Spokane (Washington) | 286.90 mi (461.73 km) |
| Boise to Spokane Valley (Washington) | 284.82 mi (458.37 km) |
