Airport terminal guide

Southwest Airlines at ONT: Terminal 4

Southwest Airlines departures from Ontario International Airport (ONT) most commonly use Terminal 4 in FlightQ's current schedule data. The airline has 31-32/day across 12 nonstop destinations from this airport.

Southwest Airlines routes from ONT

Terminal FAQ

What terminal does Southwest Airlines use at ONT?

Southwest Airlines departures at ONT most commonly use Terminal 4 in FlightQ's current schedule data.

Where does Southwest Airlines fly from ONT?

Southwest Airlines has scheduled nonstop service from ONT to 12 destinations in this dataset, led by SMF, PHX, LAS, OAK, SJC.

Terminal data is based on the most common departure terminal captured in current schedule data, checked September 28, 2026. Airports and airlines can change terminals for operational reasons, so use this as a planning guide and confirm before departure.