What is the best day to book a flight on Frontier Tuesday For ???????????????????????????????? ????????????????????????????????, Tuesday is often considered the best day to find the cheapest fares . Airlines typically update their pricing early in the week , making Tuesday a prime day to lock in lower fares before prices increase closer to the weekend.Frontier Airlines fares are typically cheaper on Tuesdays, Wednesdays, and Saturdays, thanks to lower travel demand on these days. On the other hand, Fridays and Sundays are considered peak travel times . with higher ticket prices. Booking on off-peak days can help you save more on airfare. For assistance, contact