Ontario Airport arrivals terminal are  2 and 4. Domestic flights are served by Terminal 2, while international flights are served by Terminal 4. International passengers arriving at Terminal 4 will go through immigration and customs. Passengers can easily move between the two terminals because a walkway connects them.

Over 4 million passengers disembark annually from the 100 inbound flights that arrive on average every day at ONT Airport. Several airlines, notably Southwest, American, and Delta, use the airport as a hub. Arriving travellers may anticipate a quick and easy experience with little wait time at baggage claim and customs.