| South Portland to Rury | 4,072.71 mi (6,554.39 km) |
| South Portland to Rybnik | 3,966.62 mi (6,383.65 km) |
| South Portland to Ryki | 4,036.93 mi (6,496.81 km) |
| South Portland to Rypin | 3,896.21 mi (6,270.35 km) |
| South Portland to Rzeszow | 4,098.52 mi (6,595.93 km) |
| South Portland to Sandomierz | 4,065.08 mi (6,542.11 km) |
| South Portland to Sanok | 4,124.79 mi (6,638.20 km) |
| South Portland to Sedziszow Malopolski | 4,086.07 mi (6,575.89 km) |
| South Portland to Sepolno Krajenskie | 3,813.96 mi (6,137.97 km) |
| South Portland to Sidlice | 3,823.51 mi (6,153.35 km) |
| South Portland to Siechnice | 3,880.49 mi (6,245.05 km) |
| South Portland to Siedlce | 4,029.77 mi (6,485.30 km) |
| South Portland to Siemianowice Slaskie | 3,976.34 mi (6,399.30 km) |
| South Portland to Siemiatycze | 4,041.39 mi (6,503.99 km) |
| South Portland to Sieradz | 3,921.04 mi (6,310.31 km) |
