| South Portland to Sangeorgiu de Mures | 4,327.66 mi (6,964.69 km) |
| South Portland to Sangeorz-Bai | 4,302.88 mi (6,924.82 km) |
| South Portland to Sannicolau Mare | 4,195.80 mi (6,752.48 km) |
| South Portland to Santana | 4,219.85 mi (6,791.19 km) |
| South Portland to Satu Mare | 4,217.85 mi (6,787.98 km) |
| South Portland to Scobinti | 4,387.58 mi (7,061.13 km) |
| South Portland to Scornicesti | 4,411.55 mi (7,099.71 km) |
| South Portland to Sebes | 4,316.54 mi (6,946.80 km) |
| South Portland to Seini | 4,234.64 mi (6,815.00 km) |
| South Portland to Sfantu-Gheorghe | 4,406.63 mi (7,091.79 km) |
| South Portland to Sibiu | 4,346.02 mi (6,994.24 km) |
| South Portland to Sighetu Marmatiei | 4,250.70 mi (6,840.83 km) |
| South Portland to Sighisoara | 4,353.67 mi (7,006.55 km) |
| South Portland to Simeria | 4,298.98 mi (6,918.54 km) |
| South Portland to Sinaia | 4,418.68 mi (7,111.18 km) |
