| Irthlingborough to Arcos de Valdevez | 810.57 mi (1,304.48 km) |
| Irthlingborough to Arcozelo | 865.27 mi (1,392.52 km) |
| Irthlingborough to Arganil | 907.63 mi (1,460.69 km) |
| Irthlingborough to Arouca | 865.13 mi (1,392.29 km) |
| Irthlingborough to Arruda dos Vinhos | 1,006.48 mi (1,619.77 km) |
| Irthlingborough to Aveiro | 892.37 mi (1,436.13 km) |
| Irthlingborough to Aver-o-Mar | 845.92 mi (1,361.37 km) |
| Irthlingborough to Aves | 833.91 mi (1,342.05 km) |
| Irthlingborough to Azambuja | 997.28 mi (1,604.97 km) |
| Irthlingborough to Baiao | 846.09 mi (1,361.65 km) |
| Irthlingborough to Barcelos | 835.59 mi (1,344.75 km) |
| Irthlingborough to Barreiro | 1,026.94 mi (1,652.70 km) |
| Irthlingborough to Batalha | 958.37 mi (1,542.35 km) |
| Irthlingborough to Beja | 1,047.65 mi (1,686.03 km) |
| Irthlingborough to Belas | 1,023.84 mi (1,647.71 km) |
