The latest capacity cut comes after the state of Western Australia announced it will impose a 'hard border' in an effort to prevent the spread of omicron.
The startup—which plans to have a fleet of almost 50 aircraft over the next seven years—is looking to enter markets already served by Air Canada, WestJet and Flair.
A total of 13 routes are being launched from the secondary airports in Chicago and Houston by Frontier, most of which are served by rival Southwest Airlines.