| Niederkassel to Siran | 1,701.07 mi (2,737.61 km) |
| Niederkassel to Sirnak | 1,955.81 mi (3,147.58 km) |
| Niederkassel to Sirvan | 1,913.85 mi (3,080.05 km) |
| Niederkassel to Sivas | 1,630.28 mi (2,623.68 km) |
| Niederkassel to Sivasli | 1,392.42 mi (2,240.89 km) |
| Niederkassel to Siverek | 1,813.60 mi (2,918.71 km) |
| Niederkassel to Sivrice | 1,782.63 mi (2,868.86 km) |
| Niederkassel to Sivrihisar | 1,419.00 mi (2,283.66 km) |
| Niederkassel to Sogut | 1,339.02 mi (2,154.95 km) |
| Niederkassel to Sogutlu | 1,311.57 mi (2,110.77 km) |
| Niederkassel to Soke | 1,344.85 mi (2,164.33 km) |
| Niederkassel to Solhan | 1,833.80 mi (2,951.22 km) |
| Niederkassel to Soma | 1,279.30 mi (2,058.83 km) |
| Niederkassel to Sorgun | 1,551.41 mi (2,496.75 km) |
| Niederkassel to Suhut | 1,423.27 mi (2,290.54 km) |
