| Niederkassel to Sangeorz-Bai | 830.86 mi (1,337.14 km) |
| Niederkassel to Sannicolau Mare | 702.27 mi (1,130.19 km) |
| Niederkassel to Santana | 728.07 mi (1,171.72 km) |
| Niederkassel to Satu Mare | 742.70 mi (1,195.26 km) |
| Niederkassel to Scobinti | 927.81 mi (1,493.17 km) |
| Niederkassel to Scornicesti | 918.72 mi (1,478.54 km) |
| Niederkassel to Sebes | 827.30 mi (1,331.41 km) |
| Niederkassel to Seini | 760.80 mi (1,224.38 km) |
| Niederkassel to Sfantu-Gheorghe | 923.62 mi (1,486.42 km) |
| Niederkassel to Sibiu | 857.32 mi (1,379.72 km) |
| Niederkassel to Sighetu Marmatiei | 782.37 mi (1,259.10 km) |
| Niederkassel to Sighisoara | 869.97 mi (1,400.08 km) |
| Niederkassel to Simeria | 807.93 mi (1,300.23 km) |
| Niederkassel to Sinaia | 931.19 mi (1,498.61 km) |
| Niederkassel to Slatina | 916.68 mi (1,475.26 km) |
