Question : How much should a trip from Billings (BIL) to Monterey (MRY) cost?
Answer : Prices for this trip tend to fluctuate a lot less than other flights in the United States. They can vary from $516 to $552. The further out you book a route, the more likely you are to save.
Question : How long do most people stay in Monterey?
Answer : Of course you're not most people, but if you were, you'd stay roughly three days.
Question : Is price more important than specific travel days for you?
Answer : In March, the cheapest day to fly is Thursday. Being flexible with your travel days garners even more savings during booking.