F9Frontier Airlines
…2025 Departures
…Load Factor
F9With Spirit Airlines now out of the picture, Frontier Airlines is the last nationwide ultra low cost carrier shouldering the load of coast-to-coast low fares. This airline is for the frugal traveler: the one that needs an airline to get them from A to B, that flies with just a carry-on. They are now the pinnacle of the ultra low cost airline industry here in the U.S., and that position comes with both opportunity and pressure.
Frontier is notorious for their weight management and fuel consumption practices, which get turned around on the passenger in the form of strict bag policies and high ancillary fees. This airline is best served for folks that travel lightly and don't need anything extra beyond a seat.
Frontier is the right choice if you are a budget traveler who packs light, doesn't need amenities, and is primarily concerned with getting from point A to point B at the lowest possible base fare. If you need a checked bag, want any kind of onboard service, or are flying on a route where the legacy carriers are competitive on price, look elsewhere. The fees add up quickly.
Frontier flies primarily leisure routes from its Denver base and a handful of focus cities to vacation destinations across the U.S., Mexico, and the Caribbean. Frequencies tend to be low on many routes, often a few times per week, so Frontier works best when you have schedule flexibility and are optimizing for price on a leisure trip.
5 hubs
The airports where Frontier Airlines concentrates the most flights and connections, typically where it bases aircraft and crew.
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Per-aircraft performance, 2025
How efficiently Frontier Airlines uses each aircraft type it flies: load factor, seats per flight, and passengers per departure, broken down by airplane model.
Highest-volume city pairs by seat volume
The busiest routes Frontier Airlines flies by total seats, split into domestic and international. Ranked by volume, not necessarily by profitability.
One interesting thing about Frontier is their cost management. For such a large airline, they rival Allegiant when it comes to managing operational costs. However, their margins are so razor thin that sprinkling in a few un-optimized routes sends the airline into unprofitability, which is exactly what they are going through right now.
The BTS data shows an all-Airbus A320 family fleet with a relatively small number of distinct aircraft types, a deliberate simplicity that keeps maintenance costs low. The load factor of around 78% is consistent with ULCC peers, though Frontier needs that number higher to generate meaningful margins at the fares they charge.
Understanding route metrics for Frontier Airlines
Load factor is the percentage of available seats filled with paying passengers. A route running at 85% or above is considered healthy and signals strong demand relative to capacity. When Frontier Airlines routes dip below 75%, it often means the airline is over-scheduling relative to demand, which can lead to fare cuts, frequency reductions, or eventual suspension. Routes where the load factor has declined more than 5 points versus the historical average are flagged in our Stability scoring, since sustained low fill rates are one of the strongest early indicators of a route being pulled.
Route Stability reflects how consistently a route has been operated over time and how healthy it looks today. Lower scores, flagging a route as Stability Watch or At Risk, are driven by a combination of factors: declining year-over-year passenger numbers, load factors below 75% (meaning seats are going empty), frequency cuts in 2024–2025 relative to 2023, and a history of suspension during COVID with a slow recovery. A route that Frontier Airlines skipped during 2020–2021 and never fully restored will carry a resilience penalty that drags the overall stability score down.
Route Dominance looks at Frontier Airlines's share of that route specifically. It is driven purely by Frontier Airlines's seat share on each route: Sole Operator means Frontier Airlines is the only nonstop carrier; Monopoly means it holds over 70% of seats; Dominant means 40–70%; below that falls into Competitive or Minor territory. High dominance on a busy route signals strong pricing power and low substitution risk for travelers.
Airport Commitment scores how deeply invested Frontier Airlines is at each airport it serves, specifically whether it's growing, holding steady, or pulling back. A Dominant or Committed label means the airline has meaningful seat share, stable or growing capacity, and strong route completion rates at that airport. A Marginal or Retreating label means thin seat share, capacity cuts since 2022, or a pattern of cancellations. Hub airports like Frontier Airlines's primary bases will always score highest; airports where it operates only one or two seasonal routes will score lowest.
