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 Frontier Airlines offers lower fares on Tuesdays, Wednesdays, and Saturdays reduced travel demand. Fridays and Sundays are peak travel days, so fares are usually higher. Frontier Airlines tickets, aim to book on Tuesdays, Wednesdays, or Saturdays demand is lower and prices drop