| South Portland to Senftenberg | 3,745.53 mi (6,027.85 km) |
| South Portland to Siegburg | 3,500.94 mi (5,634.23 km) |
| South Portland to Siegen | 3,530.95 mi (5,682.52 km) |
| South Portland to Sigmaringen | 3,663.32 mi (5,895.54 km) |
| South Portland to Simbach am Inn | 3,812.17 mi (6,135.09 km) |
| South Portland to Simmerath | 3,470.35 mi (5,584.98 km) |
| South Portland to Sindelfingen | 3,635.08 mi (5,850.10 km) |
| South Portland to Sinsheim | 3,613.81 mi (5,815.87 km) |
| South Portland to Sinzheim | 3,599.43 mi (5,792.73 km) |
| South Portland to Sinzig | 3,510.07 mi (5,648.91 km) |
| South Portland to Soest | 3,515.14 mi (5,657.07 km) |
| South Portland to Solingen | 3,485.93 mi (5,610.06 km) |
| South Portland to Soltau | 3,542.19 mi (5,700.60 km) |
| South Portland to Sommerda | 3,644.70 mi (5,865.58 km) |
| South Portland to Sondershausen | 3,628.79 mi (5,839.98 km) |
