Frontier Airlines has scheduled more than 50 new and returning routes to its network during the second quarter of the year, increasing its presence in the U.S. domestic market and boosting service to the Caribbean and Mexico.

As part of the expansion, the Denver-based ULCC plans to commence flights from a total of 38 airports beginning in April, May or June. Fourteen routes are opening from Dallas-Fort Worth and seven from Charlotte, as well as a further eight from Puerto Rico’s capital San Juan. Routes’ analysis shows Frontier will face competition on all but three of the 54 services being launched.

“This is a massive expansion of our operation from coast to coast and internationally as part of our focus on growing in underserved and overpriced routes,” says Josh Flyr, vice president for network and operations design at Frontier.

The routes include service from existing bases in Atlanta, Dallas-Fort Worth, Denver, Las Vegas, Miami, Philadelphia, Phoenix Sky Harbor and Tampa, Florida, as well as future bases in Chicago O’Hare and Midway, Cincinnati/Northern Kentucky, Cleveland Hopkins and San Juan that will open later this year.

Dallas-Fort Worth International Airport (DFW) will see the biggest expansion with 13 domestic additions and one new international route to Puerto Vallarta, Mexico. The move will expand Frontier’s network to 35 routes and almost 250 weekly flight departures from DFW.

Eight routes are also being launched from San Juan’s Luis Muñoz Marín International Airport (SJU) as part of plans to open a crew base at the airport in June. The airline expects to base as many as 90 pilots and 200 flight attendants at the airport within a year of its opening. Frontier notes it has more than doubled capacity to and from Porto Rico since 2019 and the latest growth will add a further 22 departures per week from SJU.

Analysis of data provided by OAG Schedules Analyser shows that Frontier has operated 21 of the 54 route additions at some point since 2020, but none have formed part of its network since 2022.

The latest schedules for early June 2024—once all 54 Frontier routes have commenced—indicate that the airline will face competition from one or more carriers on 51 of the airport pairs. Only three of the routes—Raleigh-Durham-Milwaukee, San Juan-Norfolk, and San Juan-Palm Beach—will be exclusive to Frontier.