What terminal is Southwest Airlines at Ontario airport? Southwest Airlines operates out of Terminal 4 at Ontario International Airport. Terminal 4 is the largest and busiest terminal at the airport, serving multiple airlines and handling a significant number of domestic flights. Southwest Airlines has a dedicated check-in area within the terminal, where passengers can conveniently drop off their luggage and obtain their boarding passes. Once checked in, travelers can proceed to the security checkpoint located near the Southwest Airlines counter.
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