Southwest · ONT
What gates does Southwest use at Ontario Airport (ONT)?
Southwest uses 7 gates at Ontario Airport (ONT), mainly in Terminal 4, with about 31 departures a day (Oct 3–5, 2026). It is the main airline at 6 of them.
Based on 363 Southwest flights at ONT, Oct 3–5, 2026 (full days)
How Southwest compares at ONT
- 1st of the 10 airlines with regular flights at ONT by departures: 39% of them (31 departures a day of about 79 a day).
- 40% of the seats leaving ONT: about 4,983 a day, 162 per departure.
- 3.8 turns a day at each gate it turns planes at, 31% more than the airport’s 2.9.
- Median turn at the gate: 50 min, 4 min shorter than the airport median (54 min).
- At ONT, Southwest’s 31 departures a day compare with Alaska’s 9-10 and Delta’s 9. Southwest has 6 gates of its own; Alaska 2; Delta 3.
Where Southwest flies nonstop from ONT
12 nonstop destinations. Nonstop routes seen Oct 3–5, 2026; a few days of data can miss weekly or seasonal routes.
| Destination | Flights | Other airlines on this route |
|---|---|---|
| SacramentoSMF | 5-6/day | none seen |
| Las VegasLAS | 4-5/day | Frontier (2-3/day) |
| PhoenixPHX | 4-5/day | American (3-4/day) |
| DenverDEN | 4/day | United (2/day), Frontier (2/day) |
| San JoseSJC | 3-4/day | none seen |
| OaklandOAK | 3-4/day | none seen |
| Chicago MidwayMDW | 1/day | none seen |
| Dallas Love FieldDAL | 1/day | none seen |
| HonoluluHNL | 1/day | Alaska (1/day) |
| Houston HobbyHOU | 1/day | none seen |
| NashvilleBNA | 1/day | none seen |
| AustinAUS | 4-5/week | none seen |
When Southwest flies at ONT
- First departure of the day usually around 5:20 am, the last around 11:55 pm.
- Busiest hour: 12:00 pm–1:00 pm, with about 5 of its arrivals and departures.
- About 4 of its aircraft spend the night at ONT (arrive in the evening, leave the next morning).
Southwest’s aircraft at ONT
| Aircraft | Departures | Seats each |
|---|---|---|
| 737 MAX 8 | 15/day | 175 |
| 737-700 | 12/day | 143 |
| 737-800 | 4/day | 175 |
About 4,983 seats leave ONT on Southwest each day. Of the gates it holds, 6 have taken a narrow-body. Seats are capacity from each airline’s seat map per aircraft type, not passengers.
Southwest’s gates at ONT
Terminal 4 402, 403, 404, 405, 406, 407
Held = the airline flying the gate most (regional partners count as their brand).
Gates it shares
About this data
Based on 3 full days of flights at ONT, Oct 3–5, 2026. Gates of its own are the gates where Southwest flies the most (regional partners count as their brand). Every one of its departures has a seat count.
Southwest at ONT: questions
What terminal is Southwest at Ontario Airport (ONT)?
Southwest flies from Terminal 4 at Ontario Airport (ONT).
What gates does Southwest use at ONT?
Southwest has 6 gates at ONT (the airline flying each one most): 402, 403, 404, 405, 406 and 407. It used 7 gates in all over Oct 3–5, 2026.
How many flights a day does Southwest have from ONT?
About 31 departures a day and 4,983 seats, averaged over Oct 3–5, 2026.
Where does Southwest fly nonstop from ONT?
Southwest flies nonstop to 12 cities from ONT, the most often to Sacramento, Phoenix, Las Vegas, Denver, San Jose and Oakland. Routes seen Oct 3–5, 2026.
When is Southwest’s first flight out of ONT?
Usually around 5:20 am; the last leaves around 11:55 pm.
Does Southwest share gates at ONT?
Yes: 1 gate it uses is shared or used most by another airline, e.g. gate 401 with JetBlue.
Other airlines at ONT
All of ONT’s gates by airline · Southwest at every airport we map · Nonstop routes from ONT