Frontier Airlines via ShermansTravel cuts 90% off Frontier Airlines Flights Nationwide via coupon code "SAVE90". (On the ShermansTravel landing page, click on "FlyFrontier.com" in the main paragraph to see this sale. The discount applies to base fare only.) Some exclusions and blackout dates apply. Book this travel deal December 8 for flights on select days from December 12 through February 6, 2018.

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