Frontier Airlines via ShermansTravel cuts 50% off select last minute 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 by April 27 for travel from April 28 through May 23. Planning ahead?