Two-Day Sale Unlocks Ultra-Low Cost Travel Throughout Month of SeptemberDENVER, Aug. 20, 2025 /PRNewswire/ -- Frontier Airlines (Nasdaq: ULCC) wants to be your new low fare airline, and is celebrating the end of summer with a limited-time sale to destinations throughout the U.S., the Caribbean, and Latin America. Today and tomorrow, travelers can access fares as low as $38* roundtrip on a wide variety of routes.To take advantage of this limited time offer, consumers must book travel on FlyFrontier.com or th ...