I Ranked 2025 Airline Reliability Two Ways. The Rankings Disagree.

The data behind this post started as a side effect. Travel Vient keeps a structured file on every major airline, the kind of thing that powers a baggage checker and a stack of head-to-head comparison pages, and the same file behind my basic-economy test of 74 airlines. Two of the fields in it are performance numbers: on-time arrival rate and cancellation rate. I had been treating them as one idea, reliability, and citing whichever was handy. Then I lined them up and realized they tell different stories, sometimes opposite ones.

So I ranked airline reliability two ways and compared the lists.

Here is the finding, stated plainly: the rankings disagree, and a brand’s reputation predicts neither. The most on-time airlines of 2025 were Latin American and Middle Eastern carriers, not the premium names. The US airline that cancels the most flights also runs the worst on-time rate. One carrier loses on both measures, and the two measures come from two different agencies that do not talk to each other.

How I measured this, and the part that matters

Two datasets, two sources, two definitions. I want to be exact about this because it is where most “best airline” lists go wrong.

On-time performance comes from Cirium’s 2025 On-Time Performance Review, published in January 2026. Cirium defines on-time as an arrival within 15 minutes of schedule, measured across a carrier’s entire global network. Their published full-year ranking covers 18 airlines that posted a clean 2025 figure. I use those 18 and no others. Famous carriers that Cirium did not publish a full-year 2025 number for, including Emirates, Singapore, Ryanair, and British Airways, get no invented figure here. The snapshot in my file was last verified on May 23, 2026, and matches Cirium’s published table.

Cancellation rate comes from the US Department of Transportation’s Air Travel Consumer Report, February 2026 edition, which closes out full-year 2025. It measures the share of scheduled US domestic flights that were cancelled. It covers 10 US reporting carriers and only their domestic flying. International airlines are not in it, by design. I use the network figure, which folds in the regional partners that fly under a brand, because that is what a traveler actually books. My file was last verified on May 30, 2026.

The two numbers do not combine. On-time is global and asks “did it land roughly on schedule.” Cancellation is US-only and asks “did it fly at all.” Averaging a worldwide punctuality rate with a domestic cancellation rate produces a number that means nothing, so I keep two lists. The full per-airline data is in two CSVs: on-time and cancellations.

Which airline was most on-time in 2025? The leaders aren’t who you’d guess

Here are all 18 carriers Cirium published, sorted by 2025 on-time arrival rate. Green marks Cirium’s global top 10 and regional winners. Red marks the lowest on the list.

The top of this list is the surprise. Aeromexico took the world’s most on-time global airline title at 90.02%, its second straight year. Copa actually posted a higher raw number, 90.75%, but Cirium scored Copa in the Latin America regional category, where it won for the 11th time. So the single highest figure on the board belongs to Copa while the global crown belongs to Aeromexico. Either way the message is the same: the two most punctual carriers of 2025 fly mostly out of Mexico City and Panama City.

Then Saudia, SAS, and Azul. Qatar Airways shows up at 84.42% and took the Cirium Platinum award, which is the closest thing here to a premium name landing where its reputation suggests. The famous long-haul brands people rank first, the ones with the marble lounges, are mostly not on this list at all, because Cirium did not publish a clean full-year figure for them. That absence is itself worth sitting with. Punctuality is measured and published. Prestige is not.

The bottom is the part US travelers will feel. Delta is the lone US legacy carrier in the global top 10 at 80.90%, and it has now taken North America’s most on-time title five years running. Below it: Alaska, then a cluster of Asian and US carriers between 78% and 79%, then Southwest at 77.04%, then American Airlines last of the 18 at 76.43%. The gap from Aeromexico to American is more than 13 points. That is the difference between landing on schedule nine times in ten and closer to three in four.

The cancellation list: a different question, a different shape

Now the second measure. This one is US-only, from the DOT, and it asks whether the flight happened at all. Lower is better. Green marks carriers below the 1.53% industry average; red marks those above it.

Allegiant cancelled 0.47% of its domestic schedule, the best in the country. That is a useful counter to reputation on its own. Allegiant is a no-frills carrier flying older jets to leisure markets, and it cancelled less than one flight in two hundred. Hawaiian and Southwest follow under 0.9%. The middle of the pack, Alaska through Spirit, runs from 1.30% to 1.50%, all just under or at the 1.53% industry average.

The top of the bad end is American at 2.36%, which is roughly five times Allegiant’s rate and the worst of the 10 reporting carriers. Frontier and JetBlue round out the three carriers above the industry average. A note on what the network figure includes: American’s 2.36% folds in the American Eagle regional partners that fly under the American brand. The mainline-only number is lower at 1.82%, and the same gap appears for United, whose network 1.36% drops to 0.82% mainline. The regional operation is where a lot of the cancelling happens, and a traveler booking “American” gets the network experience, so that is the figure I rank on.

The one carrier that loses both ways

Here is where the two lists, built from two unrelated sources, point at the same name. American Airlines is last of the 18 carriers on Cirium’s global on-time board at 76.43%, and it is the most-cancelled of the 10 US carriers on the DOT’s list at 2.36%. Different agency, different metric, different geographic scope. Same airline at the bottom.

That is the closest thing this data has to a clean verdict, and I want to be careful with it. It does not mean American is uniquely broken. It runs an enormous, hub-heavy, weather-exposed domestic network, and scale punishes both metrics. But it does mean that on the two reliability numbers that are actually measured and published, one of the largest airlines in the world finished worst on both in 2025. No reputation halo survives that.

The flip side is Delta. It is the only US legacy carrier in the global on-time top 10, and it sits comfortably below the cancellation average at 1.36% network. Among the big US three, Delta is the one whose reputation and measured reliability actually line up. That split is the whole story of the Delta vs American comparison.

What these numbers do not capture

Plenty, and pretending otherwise is how a data post turns into marketing.

The two measures are not interchangeable, and I have said so throughout, but it bears repeating in the caveats: a low cancellation rate can come from a carrier that flies late constantly but rarely cancels, and a strong on-time rate can come from a carrier that protects its punctuality by cancelling marginal flights early. The metrics can even pull against each other. Reading them together is the point; collapsing them into one score is the trap.

Coverage is uneven. The on-time list is global and the cancellation list is US-only, so no carrier outside the US has a cancellation figure here at all. Qatar’s 84.42% on-time rate sits next to a blank cancellation cell, and that blank is honest, not an oversight. The DOT simply does not measure foreign carriers’ operations.

These are annual averages. They flatten a brutal February storm and a calm October into one number, and they say nothing about a specific route or your specific airport. A carrier that is punctual system-wide can still be the late one out of your regional hub.

And one carrier on the on-time board is now history. Spirit Airlines appears at 78.83% because it flew all of 2025, but Spirit ceased operations on May 2, 2026. Its figure is a record of last year, not a carrier you can book. I left it in because removing a row from a published annual table would misstate the year, but it is not a recommendation.

What I changed about how I book

I stopped trusting the word reliable as if it meant one thing. Now I check two numbers before a trip that matters, and I check them separately. If a cancellation would wreck the trip, a wedding, a cruise, a same-day connection, I weight the DOT cancellation rate and lean toward the carriers under that 1.53% line. If I just want to land on schedule for a morning meeting, I weight on-time. For US flying those two answers are usually not the same airline, which is the whole reason I bothered to chart it.

The other change is smaller and more stubborn. I no longer assume the premium brand is the punctual one. The 2025 board says the most on-time airline in the world flies out of Mexico City, and the most-cancelled US airline is one of the famous three. If you want to check a specific airline’s full profile, the same dataset behind this post powers the airline comparison pages on the site, updated on a rolling cadence against the official sources.

What I still want to measure

The missing column is route-level data. A system-wide on-time rate is the right tool for ranking carriers and the wrong tool for choosing a flight, because the number that actually decides your morning is the on-time rate of your specific route on your specific airline. Cirium and the DOT both publish at finer grain than I have pulled into structured form yet. The next thing I want is a route-and-airport layer, so the question stops being “is this a punctual airline” and becomes “is this a punctual flight.”

If you have a route where the airline’s reputation and its actual record clearly diverge, I would like to hear it. The gap between the brand and the data is the part worth mapping.