| South Portland to Suhut | 4,914.72 mi (7,909.47 km) |
| South Portland to Sulakyurt | 4,966.09 mi (7,992.14 km) |
| South Portland to Sultanbeyli | 4,753.23 mi (7,649.58 km) |
| South Portland to Sultandagi | 4,942.46 mi (7,954.13 km) |
| South Portland to Sultanhani | 5,048.54 mi (8,124.85 km) |
| South Portland to Sultanhisar | 4,845.64 mi (7,798.30 km) |
| South Portland to Suluova | 5,008.97 mi (8,061.15 km) |
| South Portland to Sumbas | 5,185.31 mi (8,344.95 km) |
| South Portland to Sungurlu | 4,991.59 mi (8,033.19 km) |
| South Portland to Surmene | 5,172.10 mi (8,323.70 km) |
| South Portland to Suruc | 5,301.74 mi (8,532.33 km) |
| South Portland to Susehri | 5,133.56 mi (8,261.67 km) |
| South Portland to Susurluk | 4,755.60 mi (7,653.39 km) |
| South Portland to Susuz | 5,288.27 mi (8,510.64 km) |
| South Portland to Sutculer | 4,979.97 mi (8,014.48 km) |
