The departure terminal of 9 airlines at ONT, from observed departures and published schedules. Airlines can move flights between terminals, so check your booking before you travel.
| Airline | Terminal | Share of departures |
|---|---|---|
| Southwest Airlines Co. (WN) | 4 | T4 100% |
| Alaska Airlines (AS) | 2 | T2 100% |
| Delta Air Lines (DL) | 2 | T2 99% |
| American Airlines (AA) | 4 | T4 100% |
| United Airlines (UA) | 2 | T2 100% |
| Volaris (Y4) | 2 | T2 100% |
| Jett8 Airlines Cargo (JX) | 4 | T4 100% |
| AVIANCA (AV) | 2 | T2 100% |
| China Airlines (CI) | 2 | T2 100% |
GET /advanced-flights-schedules returns the departure board for ONT with dep_terminal and dep_gate for each flight, plus scheduled and estimated times.
https://www.goflightlabs.com/advanced-flights-schedules?access_key=YOUR_ACCESS_KEY&iataCode=ONT&type=departure
That URL still says YOUR_ACCESS_KEY.
A 7-day trial replaces it with a real key. After the trial, Starter is $24.99/mo.