| SeaTac to Montalegre | 5,086.07 mi (8,185.23 km) |
| SeaTac to Montemor-o-Novo | 5,240.38 mi (8,433.58 km) |
| SeaTac to Montemor-o-Velho | 5,143.92 mi (8,278.33 km) |
| SeaTac to Montijo | 5,215.06 mi (8,392.82 km) |
| SeaTac to Mortagua | 5,145.02 mi (8,280.11 km) |
| SeaTac to Moura | 5,294.31 mi (8,520.37 km) |
| SeaTac to Murtosa | 5,115.65 mi (8,232.84 km) |
| SeaTac to Nazare | 5,160.79 mi (8,305.49 km) |
| SeaTac to Nelas | 5,153.48 mi (8,293.72 km) |
| SeaTac to Obidos | 5,170.44 mi (8,321.02 km) |
| SeaTac to Odemira | 5,282.77 mi (8,501.80 km) |
| SeaTac to Odivelas | 5,199.71 mi (8,368.12 km) |
| SeaTac to Oeiras | 5,200.62 mi (8,369.58 km) |
| SeaTac to Olhao | 5,340.16 mi (8,594.15 km) |
| SeaTac to Oliveira de Azemeis | 5,115.34 mi (8,232.35 km) |
