| Iowa City to Sierpc | 4,730.85 mi (7,613.56 km) |
| Iowa City to Skarzysko-Kamienna | 4,852.18 mi (7,808.83 km) |
| Iowa City to Skawina | 4,870.19 mi (7,837.81 km) |
| Iowa City to Skierniewice | 4,788.24 mi (7,705.92 km) |
| Iowa City to Skoczow | 4,844.15 mi (7,795.91 km) |
| Iowa City to Skwierzyna | 4,610.43 mi (7,419.76 km) |
| Iowa City to Slawno | 4,571.45 mi (7,357.04 km) |
| Iowa City to Slubice | 4,590.57 mi (7,387.81 km) |
| Iowa City to Slupca | 4,700.30 mi (7,564.40 km) |
| Iowa City to Slupsk | 4,577.79 mi (7,367.24 km) |
| Iowa City to Sochaczew | 4,778.52 mi (7,690.28 km) |
| Iowa City to Sokolka | 4,823.46 mi (7,762.62 km) |
| Iowa City to Sokolow Podlaski | 4,833.33 mi (7,778.50 km) |
| Iowa City to Solec Kujawski | 4,676.79 mi (7,526.57 km) |
| Iowa City to Sopot | 4,625.93 mi (7,444.71 km) |
