One of the best-kept secrets is the Southwest Airlines ONT Terminal. It is really efficient, modern, and clean. No wild crowds, no long lines—just a straightforward, easy experience. Flights are usually on schedule, and the staff is kind. In addition, I adore how much simpler (and less expensive!) parking is here than at LAX. It’s my preferred airport for Southwest flights, and I suggest it to anyone searching for a hassle-free Southern California travel experience.