| South Portland to Sucha Beskidzka | 4,018.42 mi (6,467.02 km) |
| South Portland to Suchanino | 3,822.79 mi (6,152.19 km) |
| South Portland to Sulechow | 3,787.89 mi (6,096.02 km) |
| South Portland to Sulecin | 3,757.36 mi (6,046.89 km) |
| South Portland to Sulejowek | 3,991.13 mi (6,423.10 km) |
| South Portland to Suwalki | 3,983.16 mi (6,410.28 km) |
| South Portland to Swarzedz | 3,831.44 mi (6,166.11 km) |
| South Portland to Swidnica | 3,861.42 mi (6,214.36 km) |
| South Portland to Swidnik | 4,080.22 mi (6,566.48 km) |
| South Portland to Swidwin | 3,739.25 mi (6,017.74 km) |
| South Portland to Swiebodzice | 3,855.15 mi (6,204.26 km) |
| South Portland to Swiecie | 3,847.72 mi (6,192.31 km) |
| South Portland to Swiedbodzin | 3,779.38 mi (6,082.33 km) |
| South Portland to Swietochlowice | 3,973.19 mi (6,394.24 km) |
| South Portland to Swinoujscie | 3,679.80 mi (5,922.07 km) |
