| South Portland to Srbobran | 4,183.04 mi (6,731.95 km) |
| South Portland to Sremska Kamenica | 4,197.33 mi (6,754.94 km) |
| South Portland to Sremska Mitrovica | 4,197.82 mi (6,755.74 km) |
| South Portland to Sremski Karlovci | 4,201.92 mi (6,762.34 km) |
| South Portland to Stara Pazova | 4,219.74 mi (6,791.02 km) |
| South Portland to Subotica | 4,156.63 mi (6,689.45 km) |
| South Portland to Surcin | 4,231.59 mi (6,810.09 km) |
| South Portland to Surdulica | 4,392.32 mi (7,068.76 km) |
| South Portland to Svilajnac | 4,291.67 mi (6,906.78 km) |
| South Portland to Svrljig | 4,360.96 mi (7,018.28 km) |
| South Portland to Temerin | 4,191.55 mi (6,745.64 km) |
| South Portland to Titel | 4,216.52 mi (6,785.84 km) |
| South Portland to Topola | 4,268.99 mi (6,870.28 km) |
| South Portland to Trgoviste | 4,403.25 mi (7,086.35 km) |
| South Portland to Trstenik | 4,307.20 mi (6,931.77 km) |
