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Airport data

ONT performance data

Ontario International (ONT, Ontario CA) boarded 3494554 passengers in CY2024, up 9.9% vs 2023 — #54 nationally.

We hold 24 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 ONT (Ontario, CA) in 2024, 0.89% of 26175 departures were cancelled and 15.7% left 15+ min late.

    2024n=26175 departures

    Reporting carriers only; weather mix varies by region.

  • Ontario International (ONT, Ontario CA) boarded 3494554 passengers in CY2024, up 9.9% vs 2023 — #54 nationally.

    2024complete FAA enplanement census

  • At ONT (Ontario, CA) in 2023, 1.13% of 24324 departures were cancelled and 17.3% left 15+ min late.

    2023n=24324 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2022, 2.03% of 23571 departures were cancelled and 17.6% left 15+ min late.

    2022n=23571 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2021, 1.48% of 20141 departures were cancelled and 16.7% left 15+ min late.

    2021n=20141 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2019, 1.47% of 22608 departures were cancelled and 14.7% left 15+ min late.

    2019n=22608 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2018, 0.74% of 21279 departures were cancelled and 15.6% left 15+ min late.

    2018n=21279 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2017, 1.19% of 20852 departures were cancelled and 18.4% left 15+ min late.

    2017n=20852 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2014, 1.42% of 20487 departures were cancelled and 19.9% left 15+ min late.

    2014n=20487 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2013, 0.96% of 21150 departures were cancelled and 14.9% left 15+ min late.

    2013n=21150 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2012, 0.86% of 22183 departures were cancelled and 11.3% left 15+ min late.

    2012n=22183 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2011, 0.98% of 23856 departures were cancelled and 12.8% left 15+ min late.

    2011n=23856 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2010, 0.93% of 24519 departures were cancelled and 14.2% left 15+ min late.

    2010n=24519 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2009, 0.83% of 25528 departures were cancelled and 12.4% left 15+ min late.

    2009n=25528 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2008, 0.96% of 35072 departures were cancelled and 16.5% left 15+ min late.

    2008n=35072 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2007, 1.13% of 41643 departures were cancelled and 17.6% left 15+ min late.

    2007n=41643 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2006, 1.12% of 36311 departures were cancelled and 17.7% left 15+ min late.

    2006n=36311 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2005, 0.99% of 35953 departures were cancelled and 17.0% left 15+ min late.

    2005n=35953 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2004, 1.04% of 36483 departures were cancelled and 15.2% left 15+ min late.

    2004n=36483 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2003, 1.28% of 35459 departures were cancelled and 11.4% left 15+ min late.

    2003n=35459 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2002, 0.79% of 27627 departures were cancelled and 13.6% left 15+ min late.

    2002n=27627 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 2000, 2.2% of 35722 departures were cancelled and 21.6% left 15+ min late.

    2000n=35722 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 1989, 0.87% of 36306 departures were cancelled and 16.4% left 15+ min late.

    1989n=36306 departures

    Reporting carriers only; weather mix varies by region.

  • At ONT (Ontario, CA) in 1988, 0.79% of 34640 departures were cancelled and 15.7% left 15+ min late.

    1988n=34640 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: traffic-ONT-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.