| SeaTac to Sestu | 5,740.13 mi (9,237.84 km) |
| SeaTac to Settimo Torinese | 5,360.62 mi (8,627.09 km) |
| SeaTac to Seveso | 5,365.50 mi (8,634.94 km) |
| SeaTac to Sezze | 5,711.65 mi (9,192.01 km) |
| SeaTac to Siano | 5,794.07 mi (9,324.66 km) |
| SeaTac to Siena | 5,558.80 mi (8,946.03 km) |
| SeaTac to Signa | 5,525.17 mi (8,891.90 km) |
| SeaTac to Silea | 5,441.90 mi (8,757.90 km) |
| SeaTac to Silvi Paese | 5,673.40 mi (9,130.45 km) |
| SeaTac to Sinalunga | 5,574.90 mi (8,971.94 km) |
| SeaTac to Siniscola | 5,680.62 mi (9,142.08 km) |
| SeaTac to Sinnai | 5,742.98 mi (9,242.43 km) |
| SeaTac to Siracusa | 6,037.75 mi (9,716.82 km) |
| SeaTac to Solaro | 5,365.84 mi (8,635.48 km) |
| SeaTac to Soliera | 5,463.71 mi (8,792.99 km) |
