| Irthlingborough to Santarem | 983.07 mi (1,582.10 km) |
| Irthlingborough to Santiago do Cacem | 1,062.52 mi (1,709.96 km) |
| Irthlingborough to Santo Andre | 1,061.23 mi (1,707.89 km) |
| Irthlingborough to Santo Tirso | 844.09 mi (1,358.43 km) |
| Irthlingborough to Sao Bras de Alportel | 1,106.09 mi (1,780.09 km) |
| Irthlingborough to Sao Felix da Marinha | 866.30 mi (1,394.17 km) |
| Irthlingborough to Sao Joao da Madeira | 872.30 mi (1,403.83 km) |
| Irthlingborough to Sao Joao de Ver | 869.92 mi (1,400.01 km) |
| Irthlingborough to Sao Mamede de Infesta | 855.28 mi (1,376.45 km) |
| Irthlingborough to Sao Pedro do Sul | 873.51 mi (1,405.77 km) |
| Irthlingborough to Satao | 868.39 mi (1,397.53 km) |
| Irthlingborough to Seia | 888.03 mi (1,429.15 km) |
| Irthlingborough to Senhora da Hora | 857.22 mi (1,379.57 km) |
| Irthlingborough to Serpa | 1,049.02 mi (1,688.24 km) |
| Irthlingborough to Serta | 935.59 mi (1,505.68 km) |
