Between July 2024 and June 2025, the US Department of Transportation shows that Seattle-Tacoma welcomed 51.3 million two-way passengers. With about 52% of the traffic, Alaska Airlines was, as everyone knows, very much number one. With nearly a quarter, Delta Air Lines was comfortably second.

In the examined 12 months, Seattle had nonstop scheduled passenger flights to over 133 destinations worldwide, of which 37 were international. The airport welcomed various new and returning foreign long-haul carriers during this period. They include China Airlines (July 2024), STARLUX (August 2024; new), Philippine Airlines (October 2024), and SAS (May 2025 ). Meanwhile, in May 2025, Hawaiian Airlines inaugurated its first long-haul service from Seattle on behalf of Alaska . Alaska

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