| Willoughby to Secaucus (New Jersey) | 386.16 mi (621.47 km) |
| Willoughby to Security-Widefield (Colorado) | 1,242.22 mi (1,999.17 km) |
| Willoughby to Sedalia (Missouri) | 655.87 mi (1,055.52 km) |
| Willoughby to Sedro-Woolley (Washington) | 2,021.77 mi (3,253.73 km) |
| Willoughby to Seguin (Texas) | 1,244.53 mi (2,002.87 km) |
| Willoughby to Selden (New York) | 437.42 mi (703.96 km) |
| Willoughby to Selma (Alabama) | 708.74 mi (1,140.61 km) |
| Willoughby to Selma (California) | 2,060.88 mi (3,316.67 km) |
| Willoughby to Selma (Texas) | 1,259.02 mi (2,026.19 km) |
| Willoughby to Seminole (Florida) | 956.81 mi (1,539.83 km) |
| Willoughby to Seven Hills (Ohio) | 22.91 mi (36.88 km) |
| Willoughby to Seven Oaks (South Carolina) | 525.20 mi (845.22 km) |
| Willoughby to Severn (Maryland) | 302.57 mi (486.94 km) |
| Willoughby to Severna Park (Maryland) | 310.03 mi (498.95 km) |
| Willoughby to Sevierville (Tennessee) | 414.50 mi (667.08 km) |
