| Irthlingborough to Alenquer | 1,001.21 mi (1,611.30 km) |
| Irthlingborough to Alfena | 851.33 mi (1,370.09 km) |
| Irthlingborough to Alijo | 828.54 mi (1,333.41 km) |
| Irthlingborough to Aljustrel | 1,059.96 mi (1,705.84 km) |
| Irthlingborough to Almada | 1,027.80 mi (1,654.08 km) |
| Irthlingborough to Almargem | 1,019.19 mi (1,640.22 km) |
| Irthlingborough to Almeirim | 983.98 mi (1,583.56 km) |
| Irthlingborough to Amadora | 1,025.81 mi (1,650.89 km) |
| Irthlingborough to Amarante | 840.33 mi (1,352.38 km) |
| Irthlingborough to Amares | 823.37 mi (1,325.09 km) |
| Irthlingborough to Amora | 1,030.53 mi (1,658.47 km) |
| Irthlingborough to Anadia | 900.90 mi (1,449.87 km) |
| Irthlingborough to Angra do Heroismo | 1,582.53 mi (2,546.84 km) |
| Irthlingborough to Ansiao | 934.18 mi (1,503.41 km) |
| Irthlingborough to Anta | 868.03 mi (1,396.97 km) |
