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Note: Some of the offers mentioned below may have changed or are no longer be available. You can view current offers here.

Frontier is offering 20% off regular and sale fares for domestic travel July 12 through December 12, 2014. Blackout dates of November 20-26, and November 28–December 2, 2014 apply. You must purchase by 11:59 PM ET July 4, 2014 with promo code RGIFT2U to lock in the savings.

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Frontier frequently offers 10%+ off its fares through two or three day sales, but I have not seen 20% off yet.

When comparing the price after the 20% discount to other airlines’ fares, remember that Frontier now charges for carry ons and checked bags. Each passenger’s free baggage allowance is limited to one personal item.

I wish I had some firm dates for Fall travel because this sale is making some already attractive Frontier flights on under-served routes even more attractive, especially for people at Frontier hubs and focus cities:

If you book a Frontier flight, book it with your Barclaycard Arrival PlusTM World Elite MasterCard®, so that you can redeem Arrival miles to make the flight free. Meeting the minimum spending requirement of $3,000 in 90 days on the Arrival Plus is worth $500 in free Frontier flights (or any other airlines’ flights or any hotel or any other travel expense.)