| Iowa City to Sinop | 5,768.39 mi (9,283.33 km) |
| Iowa City to Siran | 5,992.44 mi (9,643.90 km) |
| Iowa City to Sirnak | 6,245.20 mi (10,050.68 km) |
| Iowa City to Sirvan | 6,200.88 mi (9,979.36 km) |
| Iowa City to Sivas | 5,952.80 mi (9,580.11 km) |
| Iowa City to Sivasli | 5,780.01 mi (9,302.02 km) |
| Iowa City to Siverek | 6,137.12 mi (9,876.74 km) |
| Iowa City to Sivrice | 6,097.26 mi (9,812.59 km) |
| Iowa City to Sivrihisar | 5,791.89 mi (9,321.15 km) |
| Iowa City to Sogut | 5,715.77 mi (9,198.64 km) |
| Iowa City to Sogutlu | 5,679.14 mi (9,139.69 km) |
| Iowa City to Soke | 5,738.00 mi (9,234.43 km) |
| Iowa City to Solhan | 6,119.77 mi (9,848.81 km) |
| Iowa City to Soma | 5,670.36 mi (9,125.56 km) |
| Iowa City to Sorgun | 5,891.68 mi (9,481.74 km) |
