| Fort Collins to Sesena | 4,994.72 mi (8,038.23 km) |
| Fort Collins to Sestao | 4,885.36 mi (7,862.23 km) |
| Fort Collins to Sevilla | 5,020.58 mi (8,079.84 km) |
| Fort Collins to Sevilla La Nueva | 4,970.59 mi (7,999.39 km) |
| Fort Collins to Silla | 5,162.17 mi (8,307.71 km) |
| Fort Collins to Silleda | 4,699.12 mi (7,562.50 km) |
| Fort Collins to Sitges | 5,166.24 mi (8,314.27 km) |
| Fort Collins to Socuellamos | 5,067.27 mi (8,154.98 km) |
| Fort Collins to Soller | 5,268.64 mi (8,479.06 km) |
| Fort Collins to Solsona | 5,120.64 mi (8,240.87 km) |
| Fort Collins to Son Servera | 5,301.46 mi (8,531.87 km) |
| Fort Collins to Sonseca | 5,001.65 mi (8,049.39 km) |
| Fort Collins to Sopelana | 4,883.40 mi (7,859.07 km) |
| Fort Collins to Soria | 4,973.14 mi (8,003.50 km) |
| Fort Collins to Suances | 4,838.71 mi (7,787.16 km) |
