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Today only, Frontier Airlines via ShermansTravel cuts 50% off select Frontier Airlines Flights Nationwide via coupon code "SAVE50". (On the ShermansTravel landing page, click on "FlyFrontier.com" in the main paragraph to see this offer. Discount applies to base fare only.) Many route exclusions and blackout dates apply. Book this travel deal today for travel through from March 12 through May 15.