| Duffel to Security-Widefield (Colorado) | 4,904.66 mi (7,893.29 km) |
| Duffel to Sedalia (Missouri) | 4,500.03 mi (7,242.10 km) |
| Duffel to Sedro-Woolley (Washington) | 4,869.98 mi (7,837.47 km) |
| Duffel to Seguin (Texas) | 5,151.58 mi (8,290.67 km) |
| Duffel to Selden (New York) | 3,613.62 mi (5,815.56 km) |
| Duffel to Selma (Alabama) | 4,576.98 mi (7,365.93 km) |
| Duffel to Selma (California) | 5,498.99 mi (8,849.77 km) |
| Duffel to Selma (Texas) | 5,164.91 mi (8,312.11 km) |
| Duffel to Seminole (Florida) | 4,633.97 mi (7,457.65 km) |
| Duffel to Seven Hills (Ohio) | 3,932.99 mi (6,329.53 km) |
| Duffel to Seven Oaks (South Carolina) | 4,258.53 mi (6,853.44 km) |
| Duffel to Severn (Maryland) | 3,838.52 mi (6,177.50 km) |
| Duffel to Severna Park (Maryland) | 3,835.60 mi (6,172.81 km) |
| Duffel to Sevierville (Tennessee) | 4,267.03 mi (6,867.12 km) |
| Duffel to Seymour (Indiana) | 4,210.50 mi (6,776.15 km) |
