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. If you’re looking for cheap airfare, try our flexible booking calendar to find the best day to fly Frontier Airlines within your schedule. The cheapest days to fly are the days when others are not flying. Friday and Sunday are heavily traveled for weekend events and getaways, but Tuesday and Wednesday are the least traveled and, therefore, might be the cheapest. These days generally have reduced +1-888-267-9551 fares due to lower demand. Avoid Fridays and Sundays, which are pricier due to higher passenger traffic.