Save at least $5 on over 150 routes in early 2020. Buy Now at DealBase Tips On the DealBase landing page, click "Frontier Airlines" in the top line to see this sale. We found this price on flights departing from Albuquerque, NM (ABQ) with arrival in Denver, CO (DEN) on February 6. Book this travel deal by December 27 for flights between January 7 and March 5. All prices, dates, and booking details were valid at the time of publication.