| Willoughby to Smithville (Missouri) | 708.10 mi (1,139.58 km) |
| Willoughby to Smyrna (Delaware) | 345.38 mi (555.84 km) |
| Willoughby to Smyrna (Georgia) | 563.79 mi (907.33 km) |
| Willoughby to Smyrna (Tennessee) | 479.16 mi (771.14 km) |
| Willoughby to Snellville (Georgia) | 556.50 mi (895.60 km) |
| Willoughby to Snoqualmie (Washington) | 2,006.92 mi (3,229.82 km) |
| Willoughby to Snyder (Texas) | 1,234.17 mi (1,986.20 km) |
| Willoughby to Socastee (South Carolina) | 565.28 mi (909.73 km) |
| Willoughby to Socorro (Texas) | 1,533.86 mi (2,468.52 km) |
| Willoughby to Soddy-Daisy (Tennessee) | 486.04 mi (782.21 km) |
| Willoughby to Solana Beach (California) | 2,041.98 mi (3,286.25 km) |
| Willoughby to Soledad (California) | 2,153.26 mi (3,465.34 km) |
| Willoughby to Solon (Ohio) | 18.00 mi (28.96 km) |
| Willoughby to Somers Point (New Jersey) | 391.86 mi (630.64 km) |
| Willoughby to Somerset (Kentucky) | 358.60 mi (577.10 km) |
