What Terminal Is Southwest at Ontario Airport (ONT)?

Wondering what terminal is southwest at ontario airport? Southwest Airlines operates from Terminal 4 at Ontario International Airport (ONT), where passengers can access airline check-in counters, ticketing services, and baggage drop facilities. This guide covers everything you need to know about Southwest arrivals and departures, including security checkpoints, boarding gates, and airport navigation. Find out where arriving passengers can collect their checked luggage and explore essential terminal facilities, including restaurants, cafes, restrooms, seating areas, and charging stations. Whether you are departing from Ontario or arriving on a Southwest flight, discover convenient transportation options such as taxis, rideshare services, rental cars, public transportation, and airport parking for a smooth journey.