In April, Frontier Airlines will offer more flights from Atlanta than from Denver

Despite having a very short lead time on its forward-looking bookings, having not published any flights for sale beyond April 13 until last week, Frontier Airlines has scheduled an aggressive schedule for the month of April, including almost 20% growth in weekly departing flights.

April will become the second month in the airline’s history in which it will offer more weekly departures from Hartsfield-Jackson Atlanta International Airport (ATL) than from Denver International Airport (DEN). The first month? January 2026. The Engine Cowl explores this and some of the other changes in the low-cost carrier’s planned schedule for the month.

154 new routes

According to Cirium’s Diio Mi, Frontier Airlines will operate154 new routes that it had not operated in April 2025. These are displayed below.

With 204 additional weekly departures from Delta Air Lines’ fortress hub, the airport is now set to become the busiest airport within Frontier Airlines’ network in terms of weekly departures and seats, overtaking DEN. The airline will grow at ATL by 94% compared to April 2025.

April will be only the second month after January 2026 during which Frontier Airlines will offer more flights from ATL than DEN since at least 2000.

During the month, Delta Air Lines will still be the largest airline at ATL, with a 76.4% market share in terms of weekly departing seats, while Frontier Airlines will be the second-largest airline at the airport with a market share of 7.9%.

Its growth at FLL is also noteworthy, considering that last April, it had only 33 weekly departures from the airport on six routes. Now, Frontier Airlines has weekly departures on 14 routes, 13 of which overlap with Spirit Airlines.

The only new route from FLL that does not overlap with Spirit Airlines is Cincinnati/Northern Kentucky International Airport (CVG), which will still be operated by Allegiant Air and Delta Air Lines.

In general, out of the 751 additional weekly departures in April, Frontier Airlines added 424 weekly flights from airports on the East Coast of the US, including such locations as ATL, Buffalo Niagara International Airport (BUF), Raleigh-Durham International Airport (RDU), and others.

Flights from this part of the country will account for 45% of Frontier Airlines’ total one-way weekly departures from the US, up from 42% last year, Cirium’s Diio Mi showed.

Removing 123 routes

At the other end of the spectrum, Frontier Airlines has also removed 123 routes that it had operated in April 2025. These are displayed below.

There are six airports that will no longer have the airline’s weekly services in April: Burlington International Airport (BTV), Harrisburg International Airport (MDT), Houston William Hobby Airport (HOU), Palm Springs International Airport (PSP), Portland International Jetport (PWM), and St. Thomas Cyril E. King Airport (STT).

Other airports with large cuts include Long Island MacArthur Airport (ISP), San Francisco International Airport (SFO), and San Juan Luis Munoz Marin International Airport (SJU), with at least 20 fewer weekly flights each from the trio.

Which LCCs publish their schedule the earliest?

Last week, Frontier Airlines made headlines after it was revealed that it does not sell tickets to passengers beyond April 13. What about other low-cost carriers?

The Engine CowlGarth Lund