| Duncan to Sesena | 4,933.76 mi (7,940.12 km) |
| Duncan to Sestao | 4,855.27 mi (7,813.79 km) |
| Duncan to Sevilla | 4,924.67 mi (7,925.49 km) |
| Duncan to Sevilla La Nueva | 4,910.25 mi (7,902.29 km) |
| Duncan to Silla | 5,109.99 mi (8,223.74 km) |
| Duncan to Silleda | 4,641.82 mi (7,470.29 km) |
| Duncan to Sitges | 5,139.89 mi (8,271.85 km) |
| Duncan to Socuellamos | 5,003.48 mi (8,052.32 km) |
| Duncan to Soller | 5,234.52 mi (8,424.15 km) |
| Duncan to Solsona | 5,099.26 mi (8,206.47 km) |
| Duncan to Son Servera | 5,269.34 mi (8,480.18 km) |
| Duncan to Sonseca | 4,936.09 mi (7,943.87 km) |
| Duncan to Sopelana | 4,854.03 mi (7,811.81 km) |
| Duncan to Soria | 4,931.96 mi (7,937.23 km) |
| Duncan to Suances | 4,805.29 mi (7,733.36 km) |
