Frontier Airlines is making a splash at the world’s busiest airport.

The Denver-based ultra-low-cost carrier is planning to significantly increase its flights out of Hartsfield-Jackson Atlanta International Airport (ATL) over the coming months.

That includes nine new destinations the airline unveiled Thursday — which will see Frontier go head-to-head on a handful of routes with Atlanta’s dominant hometown carrier (Delta Air Lines) and make the airport one of the largest bases in its network.

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As part of the expansion, Frontier will launch nonstop flights to a slew of new destinations from Atlanta.

Among those are two all-new international destinations for the carrier in Aruba and Honduras.

Along with those two new pins in its map, Frontier will launch nonstop service to a handful of large and medium cities, such as St. Louis and Kansas City, Missouri; Columbus, Ohio; and Oklahoma City.

There are a few Florida vacation spots thrown in, too, including Jacksonville, West Palm Beach and Fort Myers.

“Frontier’s expansion is proof that ATL remains the airport of choice for airlines looking to scale as we are committed to providing the infrastructure, efficiency and passenger experience to support the growth,” Jan Lennon, ATL’s interim general manager, said in a statement announcing the news.

Frontier’s 9 new ATL routes

Here’s the full rundown of Frontier’s nine new Atlanta routes unveiled Thursday — each of which is planned to launch either just before or just after the start of the summer travel rush.

Route	Launches	Frequency
ATL to Oklahoma City’s Will Rogers International Airport (OKC)	May 22	Three times weekly
ATL to Kansas City International Airport (MCI)	May 23	Three times weekly
ATL to Queen Beatrix International Airport (AUA) in Aruba	May 24	Weekly
ATL to Ramón Villeda Morales International Airport (SAP) in San Pedro Sula, Honduras	June 12	Three times weekly
ATL to St. Louis Lambert International Airport (STL)	June 12	Four times weekly
ATL to Fort Myers’ Southwest Florida International Airport (RSW)	June 12	Twice weekly
ATL to Jacksonville International Airport (JAX)	June 12	Twice weekly
ATL to Palm Beach International Airport (PBI)	June 13	Twice weekly
ATL to John Glenn Columbus International Airport (CMH)	June 13	Three times weekly

Most of these routes from Atlanta are entirely new to Frontier.

It previously flew three of these ATL routes within the past decade: St. Louis (last flown with regularly scheduled service in 2022), Kansas City (2017) and West Palm Beach (2023).

Meanwhile, Aruba and San Pedro Sula in Honduras are new destinations for Frontier.

Frontier’s larger ATL expansion

For Frontier, Thursday’s announcement signified larger growth hopes at ATL — an airport where Delta reigns supreme and there’s little competition on the low-cost end of the airline spectrum.

Filling a void left by Southwest Airlines

As TPG has reported, Southwest Airlines has dramatically scaled back its presence at the airport in recent months, with many Atlanta (and Oakland, California) flights being shifted to cities where the Dallas-based carrier is focusing its 2025 growth, such as Nashville and Sacramento, Southwest executives said last month.

During the first half of 2025, Southwest’s total number of seats offered out of Atlanta will be down by 33% over last year, according to data from aviation analytics firm Cirium. That’s after a nearly 10% drop in seats between 2023 and 2024.

Did Southwest’s pullback signal an opportunity for a budget airline to scale up in Atlanta?

Frontier sees opportunity in Atlanta

Frontier, for its part, was already on track — prior to Thursday’s announcement — to increase its Atlanta seats by more than a fifth during the first half of this year.

By summer, Frontier’s Atlanta departures will be up by around 40% compared to last year, with close to 60 daily departures, the carrier said when announcing the news Thursday.

The increased footprint at ATL will make the airport one of Frontier’s top three bases in the U.S. — its Denver International Airport (DEN) home base and Orlando International Airport (MCO) outpost will be the other two, Frontier executives noted at a news conference in Atlanta on Thursday.

“We are thrilled to partner with the leadership at Hartsfield-Jackson Atlanta International Airport to significantly grow our operations and bring more low-cost flight options to Atlanta consumers,” Frontier president James Dempsey said in a statement.

As part of its Atlanta expansion, the carrier plans to take advantage of the airport’s recently expanded Concourse E — which, we should note, is also home to ATL’s stunning new(ish) Centurion Lounge, perhaps the nicest airport club in the American Express portfolio.

How to get in: Everything you need to know about accessing Amex Centurion Lounges

Delta not backing down

We should note that despite Frontier’s gains, Delta isn’t ceding any of its Atlanta turf.

This year, its total number of departing flights will rise by around 11%, per Cirium, helped, in part, by the carrier bringing back more and more of its Delta Connection regional flights to smaller cities.

Delta is also planning to upgrade or expand a handful of ATL lounges in 2025, including an all-new Sky Club set to open later this spring.

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Major expansion: Frontier Airlines adds 9 new Atlanta routes, including new Caribbean destination