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 35-36/day across 15 nonstop destinations from this airport.

Southwest Airlines routes from ONT

ONT to SMFSacramento6-7/day
Boeing 737
ONT to LASLas Vegas4-5/day
Boeing 737
ONT to PHXPhoenix4-5/day
Boeing 737
ONT to OAKOakland4-5/day
Boeing 737
ONT to SJCSan Jose4/day
Boeing 737
ONT to DENDenver3-4/day
Boeing 737
ONT to AUSAustin1-2/day
Boeing 737
ONT to DALDallas1-2/day
Boeing 737
ONT to BNANashville1/day
Boeing 737
ONT to BWIBaltimore1/day
Boeing 737
ONT to HNLHonolulu1/day
Boeing 737
ONT to HOUHouston1/day
Boeing 737
ONT to MDWChicago1/day
Boeing 737
ONT to COSColorado Springsweekly
Boeing 737
ONT to RDURaleighweekly
Boeing 737

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 15 destinations in this dataset, led by SMF, LAS, PHX, OAK, SJC.

Terminal data is based on the most common departure terminal captured in current schedule data, checked June 15, 2026. Airports and airlines can change terminals for operational reasons, so use this as a planning guide and confirm before departure.