Reliability vs Fees 2026: The $90 Bag-Fee Airlines Are the Least On-Time

The five airlines that charge the most to check a bag are five of the seven least punctual airlines in the sample. That is the finding, and it did not require any clever modeling. It fell out of joining two files I already had.

I maintain a database of 80 airlines’ baggage rules, every fee checked against the carrier’s own policy page and stamped with a verification date. It powers a set of free tools, and in July it produced the 2026 Baggage Fee Index. The same repo also carries two reliability files I keep for the comparison pages: Cirium’s full-year 2025 on-time figures, and the US DOT’s full-year 2025 cancellation rates. I ranked those two measures on their own in June, and the rankings disagreed. This week I joined them to the fee data and asked the obvious question. When an airline charges you more, does it get you there any better?

No. Stated plainly: across the 16 airlines where both numbers exist, bag fees and punctuality run in opposite directions.

How I built the number

The fee side reuses the Baggage Fee Index methodology unchanged: the first-bag trip is the carry-on fee plus the first-checked-bag fee on each airline’s base economy fare, doubled for a round trip. Only carriers publishing a flat, comparable figure are ranked, which is 47 of the 80.

The reliability side comes from two sources with different shapes, so this study has two cuts rather than one blended score.

The first is global. Cirium’s 2025 On-Time Performance Review, published in January 2026, defines on-time as arriving within 15 minutes of schedule and reports clean full-year figures for 18 of my 80 airlines. Sixteen of those 18 also publish a flat bag fee. Those 16 are the global cut. The two drops: Aeromexico, which Cirium crowned the world’s most on-time global airline at 90.02% but which publishes no flat first-bag fee, and Spirit, which ceased operations in May 2026.

The second cut is US-only. The DOT’s Air Travel Consumer Report (February 2026 edition) logs the percentage of scheduled 2025 domestic flights each of the ten reporting carriers cancelled. I use the marketing-carrier figure, the one that includes regional partners flying under the brand, because that is what you actually book. Seven of the ten publish a flat bag fee, and all seven charge the identical $90 round trip.

The joined dataset, with per-field verification dates and source URLs, is at /data/reliability-vs-fees-2026.csv. Fee fields were verified between May 29 and July 1, 2026 against each carrier’s official baggage page.

One correlation number, offered with its caveat attached. Rank the 16 airlines by bag cost and by punctuality and the two orderings disagree hard: Spearman correlation of -0.67. With n=16 that is a real pattern, not noise, but it is a pattern in a sample Cirium chose to publish, and I will show you below what actually drives it.

The global cut: what $90 buys you

The chart is 2025 on-time percentage, sorted best to worst. Green means the first checked bag flies free on the standard economy fare. Amber means the round-trip bag cost is $20 to $60. Red means $90, the most expensive tier in this cut, which happens to be entirely US carriers.

Read the reds. Delta, Alaska, United, Southwest, and American charge the highest flat bag price in the cut, $45 each way, and they hold five of the bottom seven positions on punctuality. As a group they average 78.5% on-time. The other eleven carriers average 83.6%. Five points sounds abstract, so put it on a calendar: over 20 flights, the $90 club leaves you waiting past the 15-minute mark about four times, the rest of the table about three. You paid $90 extra for the privilege each round trip.

The top of the chart is the inverse. Saudia, SAS, Qatar Airways, Iberia, LATAM, and Turkish all beat every US carrier on punctuality, and on all of them the checked bag is already in the fare. The best performer of all is the one that breaks the tidy story: Copa, at 90.75%, charges $30 each way. Cirium has named Copa Latin America’s most on-time airline eleven times, and it is not free. Cheap and punctual, but not free.

Which is why I want to be careful with the causal reading. Bag fees do not cause delays. What the chart actually shows is that the carriers that unbundled bags most aggressively into a flat $45 fee are the US majors, and the US majors operate in the most congested, weather-battered, hub-banked system in the sample. The fee and the delays share a home, not a mechanism. The consumer takeaway survives the correction fully intact: the extra $90 is not buying you operational quality. It is not buying you anything.

The US cut: same $90, three times the cancellations

Inside the US the fee variable disappears entirely. Alaska, American, Delta, Hawaiian, JetBlue, Southwest, and United all charge $45 each way, a convergence the Baggage Fee Index traced carrier by carrier. When seven airlines charge the identical price, the fee sheet has nothing left to tell you. The DOT’s cancellation table does.

The chart is the percentage of scheduled 2025 domestic flights cancelled, including each brand’s regional partners. Shorter is better. Red rows are the $90 club. Amber rows are the carriers with no flat bag fee, the ones that price bags dynamically.

The spread inside the $90 club runs from Hawaiian at 0.82% to American at 2.36%. Same bag fee, nearly three times the cancellation rate. Translate the percentages into flights: American cancelled roughly 1 in 42 of its scheduled 2025 departures once you count the regional partners flying as American Eagle. Hawaiian cancelled about 1 in 122. If you flew American weekly last year, you probably ate a cancellation; on Hawaiian you probably didn’t.

And the quietest row on the chart is the loudest finding. Allegiant, an ultra-low-cost carrier with no flat bag fee at all, cancelled 0.47% of its flights, about 1 in 213, the best figure of any reporting US carrier. The airline brand most associated with nickel-and-diming beat every full-service major on the one metric that ruins a trip outright. Spirit sits mid-table at 1.50%, a historical entry now: it ceased operations in May 2026, and its fee fields in the dataset date to April 2026, retained only so the 2025 record stays complete.

One nuance the two cuts expose when you hold them side by side. Southwest is the second-worst on-time performer in the global cut at 77.04%, and nearly the best US carrier on cancellations at 0.85%. Delays and cancellations are different failures. An airline can run chronically 20 minutes behind and almost never abandon a flight, and Southwest apparently does exactly that. If your connection is tight, the on-time number is your risk; if it’s a wedding, the cancellation number is.

What this study does not capture

The sample is the biggest limit, and I would rather oversize this paragraph than undersize it. Cirium published clean full-year 2025 figures for 18 of my 80 airlines, and those 18 skew toward carriers Cirium highlights in its awards coverage. Ryanair, easyJet, Wizz Air, JetBlue, Hawaiian, Frontier, Allegiant, British Airways, and Emirates all have no entry in the on-time file, so the global cut cannot say anything about them, and I did not fill the holes with figures from other methodologies that count differently. Sixteen airlines is enough to see a pattern. It is not enough to call it a law.

The correlation itself is cluster-driven. All five US majors sit at the same $90, so within the US the fee has zero variance and explains nothing; the negative correlation is mostly “the American cluster charges the most and performs the worst.” I said it above and it bears repeating: this is a geography effect wearing a fee costume.

The metrics are blunt. On-time means within 15 minutes; a 14-minute delay counts as a win and a 5-hour delay counts the same as a 16-minute one. Cancellation rates are annual system-wide averages, and your route is not average: a January Chicago departure and a May Phoenix one carry very different risk on the same airline. And the DOT data covers US domestic operations only, so the free-bag international carriers at the top of the global cut have no comparable cancellation figure here.

Fees move too. The fee fields were verified May 29 to July 1, 2026, and the reliability files describe calendar 2025. An airline could re-price its bags tomorrow; on-time performance moves much more slowly.

What to actually do with this

Stop reading the bag fee as a quality signal. It isn’t one. In this data the cheapest-to-fly-with-a-bag airlines are more punctual than the most expensive ones, and inside the US the fee is a constant, so it literally cannot help you choose.

What can: on a domestic route where every carrier wants the same $90, pick by the reliability column. The gap between Hawaiian or Southwest and American is the difference between 1 cancellation in 120 flights and 1 in 42, at identical bag cost. That is a free upgrade in trip certainty. If the itinerary crosses a tight connection, weigh the on-time figure instead, and remember Southwest’s split personality: rarely cancels, often late.

For the bag math itself, the same database behind this study powers a free checked bag fee calculator, and the fee side of this analysis is unpacked airline by airline in the 2026 Baggage Fee Index.

What I am still missing

The obvious next join is the one I could not do: cancellations outside the US. Eurocontrol and the national regulators publish pieces of the European picture, but not in one comparable full-year table per marketing carrier, so the “you get what you pay for” question stays untested exactly where the free-bag carriers live. I would also like delay minutes rather than a 15-minute pass/fail, because the metric that decides whether you make a connection is how late, not whether late. If I find either dataset in a form I can verify field by field, this study gets a second edition.