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Frontier Airlines via DealBase offers 1-way nationwide flights with prices starting from $14.31. That's the best deal we could find for select routes by $5 and tied with our May mention as the lowest price we've seen for Frontier flights. Book this travel deal by August 31 for travel through November 13. Buy Now Tips On the DealBase landing page, click "Frontier Airlines" in the top line to see this sale; we found lower fares within. We found this price on flights departing on August 17 from Albuquerque, NM (ABQ) to Denver, CO (DEN). All prices, dates, and booking details were valid at the time of publication.