Question : Are prices changing frequently for this route?
Answer : Flight prices for MRY to ONT change a lot less than most routes. The further out you book a route, the more likely you are to save.
Question : How long do most people stay in Ontario when they fly in from Monterey?
Answer : Of course you're not most people, but if you were, you'd stay roughly two days.
Question : Will you do what it takes to get the absolute lowest-cost flight?
Answer : In December, Monday is your cheapest day to fly. Having flexibility in your travel plans means you can save, so be sure to plan ahead when possible.