| Sierning to Alfena | 1,211.33 mi (1,949.45 km) |
| Sierning to Alijo | 1,163.12 mi (1,871.87 km) |
| Sierning to Aljustrel | 1,326.89 mi (2,135.42 km) |
| Sierning to Almada | 1,337.08 mi (2,151.82 km) |
| Sierning to Almargem | 1,335.15 mi (2,148.71 km) |
| Sierning to Almeirim | 1,292.40 mi (2,079.91 km) |
| Sierning to Amadora | 1,338.15 mi (2,153.55 km) |
| Sierning to Amarante | 1,189.83 mi (1,914.84 km) |
| Sierning to Amares | 1,189.62 mi (1,914.51 km) |
| Sierning to Amora | 1,337.59 mi (2,152.64 km) |
| Sierning to Anadia | 1,236.41 mi (1,989.81 km) |
| Sierning to Angra do Heroismo | 2,155.55 mi (3,469.02 km) |
| Sierning to Ansiao | 1,256.06 mi (2,021.44 km) |
| Sierning to Anta | 1,223.96 mi (1,969.77 km) |
| Sierning to Arcos de Valdevez | 1,185.68 mi (1,908.16 km) |
