This is a great airport, but it is unfortunately marred by the fact that it is off the 10 freeway which has got to be one of the worst freeways in the whole universe. I avoid it at all costs. The new 210 extension has made it more bearable but unfortunately, I avoid this airport because of the freeway.
That said, Ontario Airport has the best parking, both short term and long term. The terminals are easy to find and are well-marked. It's not too big of an airport so getting around is nice and comfortable. Overall, a great place. If only they could pick it up and move it next to the 5 Freeway. Oh, wait. Even worse.
PROS: Great parking, convenient size
CONS: Horrendous traffic
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