| Harrow Weald to Sestu | 963.43 mi (1,550.48 km) |
| Harrow Weald to Settimo Torinese | 580.93 mi (934.91 km) |
| Harrow Weald to Seveso | 596.54 mi (960.04 km) |
| Harrow Weald to Sezze | 942.10 mi (1,516.17 km) |
| Harrow Weald to Siano | 1,032.33 mi (1,661.37 km) |
| Harrow Weald to Siena | 788.68 mi (1,269.26 km) |
| Harrow Weald to Signa | 756.60 mi (1,217.64 km) |
| Harrow Weald to Silea | 706.89 mi (1,137.64 km) |
| Harrow Weald to Silvi Paese | 921.07 mi (1,482.32 km) |
| Harrow Weald to Sinalunga | 806.99 mi (1,298.73 km) |
| Harrow Weald to Siniscola | 899.26 mi (1,447.22 km) |
| Harrow Weald to Sinnai | 965.75 mi (1,554.23 km) |
| Harrow Weald to Siracusa | 1,261.22 mi (2,029.74 km) |
| Harrow Weald to Solaro | 596.22 mi (959.53 km) |
| Harrow Weald to Soliera | 701.71 mi (1,129.30 km) |
