| Houghton Regis to Sestu | 985.23 mi (1,585.57 km) |
| Houghton Regis to Settimo Torinese | 601.56 mi (968.12 km) |
| Houghton Regis to Seveso | 616.01 mi (991.37 km) |
| Houghton Regis to Sezze | 962.00 mi (1,548.20 km) |
| Houghton Regis to Siano | 1,051.85 mi (1,692.78 km) |
| Houghton Regis to Siena | 808.49 mi (1,301.14 km) |
| Houghton Regis to Signa | 776.26 mi (1,249.27 km) |
| Houghton Regis to Silea | 724.39 mi (1,165.79 km) |
| Houghton Regis to Silvi Paese | 939.96 mi (1,512.73 km) |
| Houghton Regis to Sinalunga | 826.66 mi (1,330.38 km) |
| Houghton Regis to Siniscola | 920.70 mi (1,481.73 km) |
| Houghton Regis to Sinnai | 987.53 mi (1,589.28 km) |
| Houghton Regis to Siracusa | 1,281.76 mi (2,062.79 km) |
| Houghton Regis to Solaro | 615.75 mi (990.96 km) |
| Houghton Regis to Soliera | 720.83 mi (1,160.06 km) |
