| Irthlingborough to Sesimbra | 1,042.00 mi (1,676.94 km) |
| Irthlingborough to Setubal | 1,032.92 mi (1,662.33 km) |
| Irthlingborough to Sever do Vouga | 880.36 mi (1,416.80 km) |
| Irthlingborough to Silves | 1,112.53 mi (1,790.45 km) |
| Irthlingborough to Sines | 1,069.49 mi (1,721.18 km) |
| Irthlingborough to Sintra | 1,024.58 mi (1,648.90 km) |
| Irthlingborough to Sobrado de Paiva | 859.19 mi (1,382.73 km) |
| Irthlingborough to Sobral de Monte Agraco | 1,005.89 mi (1,618.82 km) |
| Irthlingborough to Soure | 929.41 mi (1,495.74 km) |
| Irthlingborough to Tabua | 897.96 mi (1,445.13 km) |
| Irthlingborough to Tavira | 1,104.76 mi (1,777.94 km) |
| Irthlingborough to Tomar | 954.35 mi (1,535.88 km) |
| Irthlingborough to Tondela | 888.86 mi (1,430.49 km) |
| Irthlingborough to Torre de Moncorvo | 827.39 mi (1,331.56 km) |
| Irthlingborough to Torres Novas | 965.15 mi (1,553.26 km) |
