| Boppard to Sangeorz-Bai | 800.50 mi (1,288.28 km) |
| Boppard to Sannicolau Mare | 664.58 mi (1,069.55 km) |
| Boppard to Santana | 692.04 mi (1,113.73 km) |
| Boppard to Satu Mare | 712.18 mi (1,146.14 km) |
| Boppard to Scobinti | 899.14 mi (1,447.03 km) |
| Boppard to Scornicesti | 881.61 mi (1,418.82 km) |
| Boppard to Sebes | 792.27 mi (1,275.04 km) |
| Boppard to Seini | 730.46 mi (1,175.57 km) |
| Boppard to Sfantu-Gheorghe | 890.29 mi (1,432.78 km) |
| Boppard to Sibiu | 822.42 mi (1,323.56 km) |
| Boppard to Sighetu Marmatiei | 753.08 mi (1,211.97 km) |
| Boppard to Sighisoara | 836.64 mi (1,346.44 km) |
| Boppard to Simeria | 772.11 mi (1,242.60 km) |
| Boppard to Sinaia | 896.53 mi (1,442.83 km) |
| Boppard to Slatina | 879.15 mi (1,414.85 km) |
