DENVER, September 12 — Frontier Airlines is safe to fly and cheap to book, and that is roughly where the good news ends. The bottom line for travelers weighing the ultra-low-cost carrier in 2026: Frontier wins on base price, and that edge shrinks fast once bags and seats are added. The airline’s model strips the fare down to the flight and the seat, then sells everything else back to passengers one item at a time.
A base ticket covers a seat on the plane — though not a specific one, which costs extra — and one free personal item up to 18 x 14 x 8 inches that must fit under the seat in front of the passenger. Everything beyond that is an a la carte charge, and the price of each add-on climbs the longer a traveler waits to buy it.
A carry-on added during booking is cheaper than the same bag paid for at the gate.
What the fees add up to
Add a carry-on, a checked bag, and a seat assignment, and a $49 fare can become a $150 fare. Fees are current as of September 2026 and subject to change at Frontier’s discretion. That fee structure is the main complaint in Frontier reviews, which cite carry-on, checked bag, and seat selection charges that can wipe out the low base fare.
Reviewers also flag tight, mostly non-reclining slimline seats, no free food or drinks, and a low on-time record relative to other major US airlines. Recovery from delays is slower because there are fewer flights to rebook passengers onto.
Frontier ranked last among the 10 major US carriers for on-time performance in 2025, according to the Bureau of Transportation Statistics.
Safety and the cabin
On safety, Frontier is safe. Like all mainstream US airlines it operates under Federal Aviation Administration rules, with the FAA setting uniform standards for aircraft maintenance, pilot training and certification, crew rest requirements, and inspections. Frontier also flies one of the youngest fleets in the US, built around fuel-efficient Airbus A320neo-family jets.
The cabin is stripped down by design. Slimline seats are built to be light and to pack more rows into the cabin; most do not recline or barely do, with thin padding, tight legroom, and a small ledge tray table rather than a full-size one.
There is no free food or drink service, no seatback screen, and no free Wifi. The competitive landscape shifted after Spirit Airlines ceased operations in May 2026. Spirit was once Frontier’s biggest ultra-low-cost competitor, and with it gone Frontier is effectively the largest remaining ULCC in the US.
Travelers comparing budget airlines today should weigh Frontier against Allegiant, Breeze, and Avelo instead.
When to book it, when to skip it
Frontier is worth considering when packing just a personal item, booking a nonstop route it flies, and keeping a flexible schedule. It should be avoided when a traveler needs a carry-on or checked bag, wants a guaranteed seat with travel companions, or is sensitive to long delays without recourse. For comfort, reliability, and peace of mind, Delta is the recommended alternative.
It includes more in the fare, runs a far larger and more punctual operation, and can rebook passengers relatively quickly when plans change. Ultra-low-cost carriers generally have the tightest seats, and Frontier is among them; Allegiant is comparable, while legacy carriers like Delta, United, and American typically offer more legroom, more recline, and wider standard seats.
Investors will note the structural tension Frontier cannot escape. The model depends on passengers paying for extras, and the extras are exactly what erode the price advantage that brings them in. The figure that matters for any traveler is not the sticker fare but the all-in cost — bags, seat, and all.
Compare that number before booking, because Frontier’s advantage disappears the moment a carry-on enters the picture.
