| Iowa City to Sesena | 4,371.61 mi (7,035.43 km) |
| Iowa City to Sestao | 4,281.77 mi (6,890.84 km) |
| Iowa City to Sevilla | 4,377.36 mi (7,044.69 km) |
| Iowa City to Sevilla La Nueva | 4,347.80 mi (6,997.10 km) |
| Iowa City to Silla | 4,544.95 mi (7,314.39 km) |
| Iowa City to Silleda | 4,077.45 mi (6,562.02 km) |
| Iowa City to Sitges | 4,565.88 mi (7,348.07 km) |
| Iowa City to Socuellamos | 4,442.63 mi (7,149.73 km) |
| Iowa City to Soller | 4,663.33 mi (7,504.91 km) |
| Iowa City to Solsona | 4,523.55 mi (7,279.96 km) |
| Iowa City to Son Servera | 4,697.56 mi (7,559.98 km) |
| Iowa City to Sonseca | 4,375.77 mi (7,042.12 km) |
| Iowa City to Sopelana | 4,280.29 mi (6,888.46 km) |
| Iowa City to Soria | 4,362.46 mi (7,020.69 km) |
| Iowa City to Suances | 4,232.77 mi (6,811.99 km) |
