Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Redmond to Billings as you normally would.
Leaving on a Tuesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 76% on the overall cost on flights from Redmond to Billings.
Flights from Redmond to Billings lean towards being more expensive in December. Prices are generally better when you fly from Redmond to Billings in June, with the cheapest ticket starting at $93.