| Fort Collins to Sestu | 5,537.71 mi (8,912.08 km) |
| Fort Collins to Settimo Torinese | 5,206.90 mi (8,379.70 km) |
| Fort Collins to Seveso | 5,230.29 mi (8,417.34 km) |
| Fort Collins to Sezze | 5,572.56 mi (8,968.17 km) |
| Fort Collins to Siano | 5,665.18 mi (9,117.23 km) |
| Fort Collins to Siena | 5,420.46 mi (8,723.38 km) |
| Fort Collins to Signa | 5,389.32 mi (8,673.28 km) |
| Fort Collins to Silea | 5,337.11 mi (8,589.25 km) |
| Fort Collins to Silvi Paese | 5,555.53 mi (8,940.76 km) |
| Fort Collins to Sinalunga | 5,439.53 mi (8,754.08 km) |
| Fort Collins to Siniscola | 5,497.53 mi (8,847.42 km) |
| Fort Collins to Sinnai | 5,541.73 mi (8,918.56 km) |
| Fort Collins to Siracusa | 5,879.61 mi (9,462.32 km) |
| Fort Collins to Solaro | 5,229.81 mi (8,416.57 km) |
| Fort Collins to Soliera | 5,336.06 mi (8,587.56 km) |
