Frontier Airlines' Black Friday 2025 sale presents passengers ultra-low prices and special discounts on both domestic and international travel. Passengers can have one-way fares as cheap as $19, along with significant savings such as up to 100% off base fares (fees and taxes will still apply) when booking round-trip travel with special promo codes. The airline also offers discount pricing on its best-selling GoWild! All-You-Can-Fly Pass, offering unlimited flight options for a set cost.