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Airport data

SEA performance data

At SEA (Seattle, WA) in 2024, 1.11% of 163724 departures were cancelled and 21.5% left 15+ min late.

We hold 27 validated statistics for this airport, covering 1988 to 2024.

What this does not meanThis airport’s figures span 1 January 2018, when the DOT changed both which carriers must report (from 1% to half of one percent of domestic scheduled passenger revenue) and how flights are attributed (from the operating carrier to the marketing carrier). Figures either side of that date describe different populations of flights, so they are listed by year below rather than drawn as one continuous trend.

Traffic and reliability

  • At SEA (Seattle, WA) in 2024, 1.11% of 163724 departures were cancelled and 21.5% left 15+ min late.

    2024n=163724 departures

    Reporting carriers only; weather mix varies by region.

  • Seattle-Tacoma International (SEA, Seattle WA) boarded 25414592 passengers in CY2024, up 3.3% vs 2023 — #12 nationally.

    2024complete FAA enplanement census

  • At SEA (Seattle, WA) in 2023, 0.6% of 163812 departures were cancelled and 19.5% left 15+ min late.

    2023n=163812 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2022, 2.0% of 174009 departures were cancelled and 18.5% left 15+ min late.

    2022n=174009 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2021, 1.43% of 168025 departures were cancelled and 15.0% left 15+ min late.

    2021n=168025 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2020, 3.66% of 101212 departures were cancelled and 9.2% left 15+ min late.

    2020n=101212 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2019, 0.81% of 142857 departures were cancelled and 18.2% left 15+ min late.

    2019n=142857 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2018, 0.47% of 139949 departures were cancelled and 17.0% left 15+ min late.

    2018n=139949 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2017, 0.61% of 137176 departures were cancelled and 17.8% left 15+ min late.

    2017n=137176 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2016, 0.38% of 132625 departures were cancelled and 15.3% left 15+ min late.

    2016n=132625 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2015, 0.39% of 121287 departures were cancelled and 16.5% left 15+ min late.

    2015n=121287 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2014, 0.46% of 108714 departures were cancelled and 16.3% left 15+ min late.

    2014n=108714 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2013, 0.41% of 103082 departures were cancelled and 15.8% left 15+ min late.

    2013n=103082 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2012, 0.66% of 100165 departures were cancelled and 13.7% left 15+ min late.

    2012n=100165 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2011, 0.51% of 100136 departures were cancelled and 12.6% left 15+ min late.

    2011n=100136 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2010, 0.49% of 98598 departures were cancelled and 13.2% left 15+ min late.

    2010n=98598 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2009, 0.48% of 100980 departures were cancelled and 15.2% left 15+ min late.

    2009n=100980 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2008, 1.05% of 109069 departures were cancelled and 19.8% left 15+ min late.

    2008n=109069 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2007, 0.99% of 109127 departures were cancelled and 25.7% left 15+ min late.

    2007n=109127 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2006, 0.85% of 107541 departures were cancelled and 24.4% left 15+ min late.

    2006n=107541 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2005, 0.94% of 106586 departures were cancelled and 24.2% left 15+ min late.

    2005n=106586 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2004, 1.17% of 109418 departures were cancelled and 20.7% left 15+ min late.

    2004n=109418 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2003, 1.04% of 104605 departures were cancelled and 14.6% left 15+ min late.

    2003n=104605 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2002, 0.98% of 85994 departures were cancelled and 16.9% left 15+ min late.

    2002n=85994 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 2000, 3.11% of 104910 departures were cancelled and 27.3% left 15+ min late.

    2000n=104910 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 1989, 1.33% of 73754 departures were cancelled and 24.0% left 15+ min late.

    1989n=73754 departures

    Reporting carriers only; weather mix varies by region.

  • At SEA (Seattle, WA) in 1988, 0.8% of 71281 departures were cancelled and 20.0% left 15+ min late.

    1988n=71281 departures

    Reporting carriers only; weather mix varies by region.

What this page does not tell you

  • Cancellation and delay rates are not directly comparable between airports. Route networks differ and so does the weather they fly through, and the source data says so.
  • Nothing here tells you what you are owed. That depends on the rule that applies to your situation, which is on the passenger rights pages.
  • These are counts and rates, not explanations. We have not tested why any figure moved.

Sources and provenance

Written by Row30 Data Desk. Data reviewed by Row30 Data Desk on July 26, 2026.

Underlying federal data covers 1988 to 2024.

Every figure above traces to a row in our statistics database: rel-airport-SEA-2024. Each was validated against its source row before this page could publish.

Found an error? Tell us and it goes in the public log.

How this article was produced

Produced with AI assistance and reviewed by a named human before publishing. The pipeline that pulls the federal data and computes the statistics is conventional software, not a language model. Software is never credited as an author.

Before a page can publish, an automated check matches every number in the draft against the stored source row. If a digit does not reconcile, the article is blocked. The same check confirms the period is stated, the citation is carried verbatim, the licence permits the use, and no comparative claim outruns its stated uncertainty.

How the Row30 Data Desk works, including what it is not.

Our full editorial standards are on the editorial guidelines page.

Source: Federal Aviation Administration passenger boarding data; analysis by Row30.

Source: U.S. DOT Bureau of Transportation Statistics; analysis by Row30.