| Welwyn Garden City to Sestu | 972.11 mi (1,564.47 km) |
| Welwyn Garden City to Settimo Torinese | 587.10 mi (944.85 km) |
| Welwyn Garden City to Seveso | 600.91 mi (967.08 km) |
| Welwyn Garden City to Sezze | 947.08 mi (1,524.17 km) |
| Welwyn Garden City to Siano | 1,036.75 mi (1,668.48 km) |
| Welwyn Garden City to Siena | 793.53 mi (1,277.06 km) |
| Welwyn Garden City to Signa | 761.23 mi (1,225.08 km) |
| Welwyn Garden City to Silea | 708.81 mi (1,140.71 km) |
| Welwyn Garden City to Silvi Paese | 924.65 mi (1,488.09 km) |
| Welwyn Garden City to Sinalunga | 811.63 mi (1,306.19 km) |
| Welwyn Garden City to Siniscola | 907.00 mi (1,459.68 km) |
| Welwyn Garden City to Sinnai | 974.37 mi (1,568.09 km) |
| Welwyn Garden City to Siracusa | 1,267.19 mi (2,039.34 km) |
| Welwyn Garden City to Solaro | 600.68 mi (966.70 km) |
| Welwyn Garden City to Soliera | 705.59 mi (1,135.54 km) |
