Frontier Airlines is the latest carrier to unveil a big expansion as the industry continues to recover from the worst of the pandemic.The Denver-based ultra low-cost carrier unveiled 21 new routes on Tuesday that grow its presence in three of its busier bases.“We’re thrilled to continue growing with a new round of 21 nonstop routes that greatly expand our service in three major markets: Atlanta, Dallas and Las Vegas,” Daniel Shurz, Frontier’s senior vice president of commercial, said in a statement. “Today’s announcement highlights our confidence in travel’s continued rebound for the rest of 2021 and beyond.”Want more airline-specific news? Sign up for TPG’s free new biweekly Aviation newsletter!The biggest winner in Tuesday’s announcement was Atlanta, which landed nine of the new routes. With the additions, Frontier will now offer either seasonal or year-round service to 32 destinations from the city.Dallas-Fort Worth got seven new routes, bringing Frontier’s count of nonstop destinations there to 20. And Las Vegas now has 54 nonstop destinations on Frontier after landing five new routes.Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.The full details of the new routes are below. All are currently planned to be year-round.Frontier’s new routes from Atlanta (ATL)DestinationStart dateFrequency Baltimore (BWI)Sept. 8Four times weeklyCancun, Mexico (CUN)Nov. 2Four times weeklyChicago O’Hare (ORD)Sept. 8Four times weeklyDetroit (DTW)Sept. 7Three times weeklyHouston Bush Intercontinental (IAH)Sept. 8Four times weeklyMontego Bay, Jamaica (MBJ)Nov. 1Three times weeklyNew Orleans (MSY)Sept. 9Three times weeklySt. Louis (STL)Sept. 7Three times weeklyWest Palm Beach, Florida (PBI)Nov. 1DailyFrontier’s new routes from Dallas-Fort Worth (DFW)DestinationStart dateFrequencyBuffalo, New York (BUF)April 24Three times weeklyDurango, Colorado (DRO)April 30One flight per weekHartford, Connecticut (BDL)April 25Three times weeklyPhoenix (PHX)Nov. 1Four times weeklySan Diego (SAN)Sept. 7Three times weeklySan Francisco (SFO)Sept. 8Four times weeklyTampa (TPA)Nov. 2Four times weeklyFrontier’s new routes from Las Vegas (LAS)DestinationStart dateFrequencyDes Moines (DSM)Sept. 10Twice weeklyHarlingen, Texas (HRL)Sept. 9Twice weeklyMinneapolis-St. Paul (MSP)Sept. 9Four times weeklyNew Orleans (MSY)Sept. 9Four times weeklySioux Falls, South Dakota (FSD)Sept. 9Twice weekly