| Westbrook to Sierpc | 3,909.58 mi (6,291.87 km) |
| Westbrook to Skarzysko-Kamienna | 4,017.80 mi (6,466.03 km) |
| Westbrook to Skawina | 4,018.44 mi (6,467.06 km) |
| Westbrook to Skierniewice | 3,959.18 mi (6,371.68 km) |
| Westbrook to Skoczow | 3,985.34 mi (6,413.78 km) |
| Westbrook to Skwierzyna | 3,766.32 mi (6,061.31 km) |
| Westbrook to Slawno | 3,753.16 mi (6,040.13 km) |
| Westbrook to Slubice | 3,739.44 mi (6,018.05 km) |
| Westbrook to Slupca | 3,863.81 mi (6,218.21 km) |
| Westbrook to Slupsk | 3,762.40 mi (6,055.00 km) |
| Westbrook to Sochaczew | 3,952.81 mi (6,361.43 km) |
| Westbrook to Sokolka | 4,027.40 mi (6,481.47 km) |
| Westbrook to Sokolow Podlaski | 4,019.67 mi (6,469.03 km) |
| Westbrook to Solec Kujawski | 3,850.88 mi (6,197.40 km) |
| Westbrook to Sopot | 3,817.49 mi (6,143.65 km) |
