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In 2024, Ontario International Airport in California recorded over seven million round-trip passengers, marking the first time in 17 years that it has reached this level. This represents an increase of more than 25% compared to its pre-pandemic passenger numbers from 2019. The growth has been led by airlines such as Delta Air Lines, United Airlines, and Volaris. The airport also saw new service from Avianca beginning in 2021 and STARLUX starting in 2025, while Avelo launched flights in 2024 but later exited the market.
Ontario International Airport’s management attended Routes World in Hong Kong to promote the airport among a global audience of airline and tourism industry professionals. The airport’s promotional materials included statements such as: "More than nine million people live closer to ONT than LAX," "Introducing Southern California's fastest and easiest airport," "ONT is the fastest-growing of the ten largest airports in California," and "ONT is open 24/7; you won't find slots or curfews here!" These messages highlighted accessibility and operational flexibility, features valued especially by cargo carriers.
Data for October 2025 through January 2026 show that Ontario’s passenger departures have increased by over two percent year-on-year, with an average of 76 daily takeoffs—sometimes reaching up to 90. Following Avelo’s departure in March 2025, eleven airlines now operate at Ontario International: Southwest (which accounts for about 42% of all departures), American (14%), Delta (11%), Alaska Airlines, Avianca, China Airlines, Frontier, JetBlue, STARLUX, United, and Volaris.
