| Irthlingborough to Benavente | 1,002.50 mi (1,613.38 km) |
| Irthlingborough to Bombarral | 989.85 mi (1,593.02 km) |
| Irthlingborough to Bougado | 845.75 mi (1,361.11 km) |
| Irthlingborough to Braga | 829.37 mi (1,334.73 km) |
| Irthlingborough to Braganca | 781.41 mi (1,257.56 km) |
| Irthlingborough to Cabeceiras de Basto | 822.30 mi (1,323.37 km) |
| Irthlingborough to Cacem | 1,024.87 mi (1,649.37 km) |
| Irthlingborough to Cadaval | 991.01 mi (1,594.88 km) |
| Irthlingborough to Caldas da Rainha | 980.53 mi (1,578.02 km) |
| Irthlingborough to Calheta | 1,586.54 mi (2,553.29 km) |
| Irthlingborough to Camara de Lobos | 1,583.58 mi (2,548.53 km) |
| Irthlingborough to Canico | 1,583.67 mi (2,548.66 km) |
| Irthlingborough to Cantanhede | 909.63 mi (1,463.91 km) |
| Irthlingborough to Carregal do Sal | 892.70 mi (1,436.66 km) |
| Irthlingborough to Cartaxo | 990.32 mi (1,593.77 km) |
