| SeaTac to Sangeorgiu de Mures | 5,639.40 mi (9,075.74 km) |
| SeaTac to Sangeorz-Bai | 5,590.62 mi (8,997.23 km) |
| SeaTac to Sannicolau Mare | 5,597.82 mi (9,008.82 km) |
| SeaTac to Santana | 5,597.10 mi (9,007.67 km) |
| SeaTac to Satu Mare | 5,531.89 mi (8,902.71 km) |
| SeaTac to Scobinti | 5,627.88 mi (9,057.20 km) |
| SeaTac to Scornicesti | 5,767.82 mi (9,282.40 km) |
| SeaTac to Sebes | 5,660.89 mi (9,110.33 km) |
| SeaTac to Seini | 5,541.73 mi (8,918.55 km) |
| SeaTac to Sfantu-Gheorghe | 5,706.72 mi (9,184.08 km) |
| SeaTac to Sibiu | 5,682.22 mi (9,144.65 km) |
| SeaTac to Sighetu Marmatiei | 5,541.04 mi (8,917.44 km) |
| SeaTac to Sighisoara | 5,666.52 mi (9,119.39 km) |
| SeaTac to Simeria | 5,657.51 mi (9,104.88 km) |
| SeaTac to Sinaia | 5,735.68 mi (9,230.69 km) |
