| Northolt to Sestu | 960.77 mi (1,546.20 km) |
| Northolt to Settimo Torinese | 578.94 mi (931.72 km) |
| Northolt to Seveso | 595.03 mi (957.61 km) |
| Northolt to Sezze | 940.41 mi (1,513.45 km) |
| Northolt to Siano | 1,030.78 mi (1,658.89 km) |
| Northolt to Siena | 787.03 mi (1,266.61 km) |
| Northolt to Signa | 755.02 mi (1,215.08 km) |
| Northolt to Silea | 706.04 mi (1,136.26 km) |
| Northolt to Silvi Paese | 919.76 mi (1,480.20 km) |
| Northolt to Sinalunga | 805.40 mi (1,296.16 km) |
| Northolt to Siniscola | 896.85 mi (1,443.34 km) |
| Northolt to Sinnai | 963.11 mi (1,549.97 km) |
| Northolt to Siracusa | 1,259.26 mi (2,026.58 km) |
| Northolt to Solaro | 594.69 mi (957.07 km) |
| Northolt to Soliera | 700.33 mi (1,127.07 km) |
