| Boston to Sangeorgiu de Mures | 1,172.36 mi (1,886.73 km) |
| Boston to Sangeorz-Bai | 1,152.75 mi (1,855.17 km) |
| Boston to Sannicolau Mare | 1,036.30 mi (1,667.76 km) |
| Boston to Santana | 1,060.30 mi (1,706.39 km) |
| Boston to Satu Mare | 1,065.58 mi (1,714.88 km) |
| Boston to Scobinti | 1,245.05 mi (2,003.71 km) |
| Boston to Scornicesti | 1,251.88 mi (2,014.70 km) |
| Boston to Sebes | 1,157.88 mi (1,863.43 km) |
| Boston to Seini | 1,083.14 mi (1,743.14 km) |
| Boston to Sfantu-Gheorghe | 1,251.03 mi (2,013.34 km) |
| Boston to Sibiu | 1,187.61 mi (1,911.27 km) |
| Boston to Sighetu Marmatiei | 1,102.24 mi (1,773.89 km) |
| Boston to Sighisoara | 1,197.59 mi (1,927.33 km) |
| Boston to Simeria | 1,139.66 mi (1,834.11 km) |
| Boston to Sinaia | 1,260.91 mi (2,029.23 km) |
