11 Passenger Airlines, 30 Destinations: Inside This US Airport’s Impressive Growth

In 2024, Ontario International Airport welcomed just over seven million round-trip passengers. It was the first time traffic had exceeded seven million in 17 years. Compared to before the pandemic in 2019, throughput increased by more than a quarter. This growth was particularly driven by incumbents Delta Air Lines, United Airlines, and Volaris. However, the arrival of Avianca in 2021, followed by Avelo in 2024 (although it has since exited). STARLUX launched in 2025.