| Didcot to Sinop | 1,820.76 mi (2,930.24 km) |
| Didcot to Siran | 2,063.07 mi (3,320.20 km) |
| Didcot to Sirnak | 2,317.63 mi (3,729.86 km) |
| Didcot to Sirvan | 2,275.75 mi (3,662.47 km) |
| Didcot to Sivas | 1,991.45 mi (3,204.94 km) |
| Didcot to Sivasli | 1,741.62 mi (2,802.87 km) |
| Didcot to Siverek | 2,174.30 mi (3,499.20 km) |
| Didcot to Sivrice | 2,143.88 mi (3,450.24 km) |
| Didcot to Sivrihisar | 1,774.45 mi (2,855.70 km) |
| Didcot to Sogut | 1,693.69 mi (2,725.73 km) |
| Didcot to Sogutlu | 1,668.83 mi (2,685.72 km) |
| Didcot to Soke | 1,685.00 mi (2,711.75 km) |
| Didcot to Solhan | 2,195.78 mi (3,533.77 km) |
| Didcot to Soma | 1,625.66 mi (2,616.25 km) |
| Didcot to Sorgun | 1,911.56 mi (3,076.36 km) |
