Frontier Airlines flies to Cancun from ... as the only airline operating year-round. At 1,248 miles, this city pairing has a typical flight time of under three hours and 30 minutes.

Flight No. 1248, from Denver to Grand Rapids, Mich., landed at about 3:45 p.m. Frontier Airlines told 6 News that an engine indicator light came on during the flight, prompting the pilots to ...