Which Airline Cancels the Most Flights? (2024–2025 BTS Data)
Matt — Founder. Published September 17, 2026. Updated October 1, 2026. 7 min read.
Figures checked against DelayGuard BTS tables on 2026-10-01. Canonical page: US airline cancellation rates 2024 to 2025.
Not all airlines are equally likely to cancel your flight. The difference between the best and worst major US carrier is more than 2× — and it's consistent enough across 14 million flights that it's worth knowing before you book.
We pulled the full Bureau of Transportation Statistics On-Time Performance dataset for 2024–2025 — 14,080,680 scheduled domestic departures, 199,191 cancellations — and ranked every major US airline by cancellation rate. Here's what it shows.
The Full Ranking: Best to Worst
| Airline | Cancellation Rate | 1 in N Flights | Scheduled Flights |
|---|
| Southwest Airlines | 0.84% | 1 in 119 | 2,811,304 |
| Hawaiian Airlines | 0.93% | 1 in 107 | 158,614 |
| Delta Air Lines | 1.00% | 1 in 100 | 2,035,506 |
| Allegiant Air | 1.06% | 1 in 94 | 248,109 |
| United Airlines | 1.22% | 1 in 82 | 1,555,722 |
| Alaska Airlines | 1.58% | 1 in 63 | 491,407 |
| JetBlue Airways | 1.60% | 1 in 62 | 471,695 |
| American Airlines | 1.68% | 1 in 59 | 1,957,959 |
| Spirit Airlines* | 1.74% | 1 in 57 | 455,618 |
| Frontier Airlines | 2.05% | 1 in 49 | 406,689 |
*Spirit Airlines ceased all operations on May 2, 2026. Hawaiian Airlines operates as part of Alaska Airlines from April 2026, so its figure is historical for 2024 to 2025.
The US domestic average is 1.41% — roughly 1 in 71 flights.
What Makes the Difference?
The gap between Southwest (0.84%) and Frontier (2.05%) isn't random variation. It reflects fundamental differences in how these airlines are built.
Ultra-low-cost carriers carry more cancellation risk
Frontier and Spirit both operated on the ultra-low-cost model: maximize aircraft utilization, minimize ground time, run tight turnarounds, keep costs as low as possible. That model delivers low fares — but it also leaves almost no buffer in the system.
When something goes wrong — a mechanical issue, a crew timing problem, a weather delay at one airport — there is no spare aircraft nearby, no interline agreement with another carrier to rebook stranded passengers, and no crew on reserve to cover the gap. The flight gets cancelled.
Southwest, by contrast, runs a point-to-point network that keeps its aircraft moving. When disruptions hit, it has more tools to recover. Its 0.84% rate over 2.8 million flights is the best in this dataset among carriers with significant scale.
Delta runs the most resilient operation
Delta at 1.00% is the benchmark among the legacy carriers. Its hub-and-spoke model at ATL — the busiest airport in the world — gives it extraordinary recovery capability. When Atlanta has a good day, Delta has a good day across hundreds of downstream routes.
Delta also invests heavily in what the industry calls operational reliability: spare aircraft positioned at hubs, crew reserves, and a maintenance programme that reduces unscheduled ground stops. That investment shows up in the data.
American's 1.68% rate reflects a network under strain
American cancels more flights than Delta or United despite operating a similar hub-and-spoke model. Its DFW and ORD hubs both sit in high-cancellation environments — DFW sees 2.31% of all departures cancelled, one of the highest rates among major US airports. When your primary hub is in severe weather territory, it shows in your annual numbers.
Does Your Airport Matter Too?
Yes — significantly. The airline is one variable; the airport is another. For scale, LGA's 2.67% cancellation rate is about 3.2x Southwest's 0.84%, the lowest airline rate in the table above (cancellation rates).
Highest-cancellation major airports (BTS 2024–2025):
Lowest-cancellation major airports:
A Frontier flight departing from LGA is a double exposure — a high-cancellation airline at a high-cancellation airport. A Delta flight departing from SLC is the opposite end of the spectrum.
What About Spirit Airlines?
Spirit's 1.74% rate in this dataset is historical — the airline ceased all operations on May 2, 2026, following its second bankruptcy filing in 18 months. Its routes have largely been absorbed by Frontier, Southwest, and other carriers offering rescue fares.
Spirit's closure leaves Frontier as the last major ultra-low-cost carrier operating in the US domestic market.
How to Use This Before You Book
The cancellation rate alone doesn't tell the whole story — your specific route, departure month, and current conditions all matter. A Delta flight in January from ORD faces a different cancellation environment than a Delta flight in October from ATL.
DelayGuard shows the historical cancellation rate for your specific route and airline alongside the delay probability on every prediction result — resolved at route × airline × departure month for the most accurate baseline. Check it before you book, not just before you fly.
The Bottom Line
If cancellation risk matters to you, the data is clear:
- Best major carriers: Southwest (0.84%), Delta (1.00%), United (1.22%)
- Highest risk: Frontier (2.05%), American (1.68%), JetBlue (1.60%)
- Airport compounds the airline: LGA, EWR, and DFW add meaningful additional risk regardless of carrier
- The ULCC model trades cancellation resilience for low fares — a trade-off worth understanding before you book
For the full ranked table with methodology, see the US Airline Cancellation Rates 2024–2025 page, and cancellation rates by route for the highest-cancellation routes.
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