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I received a great email this morning from Frontier letting me know that through this weekend only, they are offering 35% off all flights for travel August 25 through September 6, 2015 (blackout dates September 3-5). This is also available for every day during the two week timeframe and no Friday or Sunday exclusions which is nice.
To book a flight using this promotion, make sure to use promo code SAVEBIG. You can book a flight and see all the terms of the offer here.