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Right now Frontier Airlines is offering 90% Off select Airfare Sale when you use code SAVE90 at checkout.Sale valid 9/12 - 9/13/17. Buy by: 9/13/17. Fly through 12/16/17. Valid Mondays - Thursdays and Saturdays for domestic travel in select markets. 7 day advance purchase applies. The following blackout dates apply: Nov. 18-28, 2017. More about this offer.