Airlines at Ontario International Airport (ONT)
Ontario, California KONT #53 US airport by passengers
Airlines operating at ONT, ranked by number of departures.
On-time performance at ONT
Based on 6,979 departures from May 2026 to July 2026. A flight counts as late when it leaves 15 or more minutes after schedule.
23.0%Departures late
26.9%Arrivals late
0.84%Cancelled
16.3 minAverage departure delay
| Airline | Departures | Late |
|---|---|---|
| Southwest Airlines | 3,048 | 28.2% |
| American Airlines | 889 | 19.0% |
| Frontier Airlines | 695 | 26.9% |
| United Airlines | 609 | 21.5% |
| Alaska Airlines | 591 | 16.1% |
| SkyWest Airlines | 536 | 15.7% |
| Delta Air Lines | 511 | 8.8% |
Source: Bureau of Transportation Statistics, On-Time Performance of reporting carriers. Smaller regional carriers and some airlines are not included.
Airline presence
Passenger airlines use Terminal 2 and Terminal 4. Check the airport site for the current list of airlines.