| South Portland to Sudbury | 3,210.09 mi (5,166.14 km) |
| South Portland to Sunbury | 3,177.56 mi (5,113.78 km) |
| South Portland to Sunderland | 3,068.60 mi (4,938.44 km) |
| South Portland to Sunninghill | 3,168.61 mi (5,099.39 km) |
| South Portland to Surbiton | 3,182.98 mi (5,122.51 km) |
| South Portland to Sutton | 3,188.13 mi (5,130.80 km) |
| South Portland to Sutton Coldfield | 3,096.49 mi (4,983.32 km) |
| South Portland to Sutton in Ashfield | 3,107.44 mi (5,000.94 km) |
| South Portland to Sutton on Hull | 3,131.82 mi (5,040.18 km) |
| South Portland to Swadlincote | 3,102.79 mi (4,993.46 km) |
| South Portland to Swallownest | 3,100.14 mi (4,989.20 km) |
| South Portland to Swanage | 3,132.82 mi (5,041.78 km) |
| South Portland to Swindon | 3,119.26 mi (5,019.96 km) |
| South Portland to Swinton | 3,098.06 mi (4,985.84 km) |
| South Portland to Swinton | 3,057.10 mi (4,919.92 km) |
