| SeaTac to Arcos de Valdevez | 5,064.02 mi (8,149.76 km) |
| SeaTac to Arcozelo | 5,098.42 mi (8,205.12 km) |
| SeaTac to Arganil | 5,162.49 mi (8,308.23 km) |
| SeaTac to Arouca | 5,118.10 mi (8,236.79 km) |
| SeaTac to Arruda dos Vinhos | 5,193.40 mi (8,357.98 km) |
| SeaTac to Aveiro | 5,120.37 mi (8,240.44 km) |
| SeaTac to Aver-o-Mar | 5,075.70 mi (8,168.55 km) |
| SeaTac to Aves | 5,089.48 mi (8,190.72 km) |
| SeaTac to Azambuja | 5,195.88 mi (8,361.97 km) |
| SeaTac to Baiao | 5,112.84 mi (8,228.32 km) |
| SeaTac to Barcelos | 5,074.85 mi (8,167.19 km) |
| SeaTac to Barreiro | 5,210.17 mi (8,384.95 km) |
| SeaTac to Batalha | 5,167.28 mi (8,315.94 km) |
| SeaTac to Beja | 5,284.77 mi (8,505.01 km) |
| SeaTac to Belas | 5,197.31 mi (8,364.26 km) |
