Explainer14 min readAugust 8, 2026
Mistake Fares, Explained: What They Are and Whether Airlines Honor Them
A $16,000 business class seat sells for $675. Someone somewhere is having a bad morning. Here is what happens next, and what you should do in the ten minutes you have.
What is in this guide
- What a mistake fare is
- Mistake fare vs sale fare vs award sweet spot
- How a mistake fare actually happens
- Do airlines have to honor mistake fares?
- Mistake fares that actually happened
- How to tell a mistake fare from a good sale
- The ten-minute booking protocol
- The two weeks after you book
- If the airline cancels it
- Are mistake fares disappearing?
- Are they worth chasing at all?
- Frequently asked questions
The short answer
A mistake fare is an airline ticket sold at a price the airline never intended to publish, usually 60% to 95% below normal, caused by a filing or systems error. In the United States, airlines are not required to honor them: a May 2015 Department of Transportation policy permits cancellation, provided the carrier refunds the ticket and reimburses reasonable, verifiable out-of-pocket costs you incurred relying on it.
~70%
Industry estimate of mistake fares that get honored
2–12 hrs
How long a typical mistake fare stays bookable
60–95%
Usual discount against the route's normal price
May 2015
DOT policy that let airlines start cancelling them
Somewhere in an airline’s fare filing system, a currency conversion runs at the wrong rate, or a fuel surcharge fails to attach, or a fare gets loaded against a cabin it was never meant for. For a few hours, a $16,000 business class ticket sells for $675. Then somebody notices.
What happens in those few hours, and in the fortnight afterward, is governed by a fairly specific set of rules that almost nobody knows. This is those rules: what a mistake fare is, why they happen, what the Department of Transportation actually says about honoring them, and the booking protocol that gives you the best chance of flying.
What a mistake fare is
Mistake fare (also: error fare, glitch fare)
An airline ticket sold at a price the carrier did not intend to publish, caused by an error in fare filing, currency conversion, tax or surcharge calculation, or third-party distribution. Mistake fares typically run 60% to 95% below the route’s normal price, remain bookable for two to twelve hours, and may be cancelled by the airline after purchase.
Two things distinguish a mistake fare from every other cheap ticket. The first is the depth: a sale is 20% or 40% off, a mistake fare is often 90%. The second is the intent. A sale is a decision. A mistake fare is an accident, and because it is an accident, it comes with a chance the airline unwinds it.
That conditionality is the whole subject. Booking one is easy. Knowing how to behave for the two weeks afterward is what separates people who end up in Tokyo from people who end up with a refund and a cancelled hotel reservation.
Mistake fare vs sale fare vs award sweet spot
These three get conflated constantly, and they behave completely differently.
| Mistake fare | Sale fare | Award sweet spot | |
|---|---|---|---|
| Intentional? | No | Yes | Yes, but not repriced often |
| Typical discount | 60–95% | 15–40% | Varies; often 3–8 cents per point of value |
| How long it lasts | Hours | Days to weeks | Months or years, until the chart changes |
| Can it be cancelled? | Yes | No | No, once ticketed |
| Costs you | Cash | Cash | Points, plus taxes and surcharges |
| Book hotels immediately? | No | Yes | Yes |
Most of what circulates as a “mistake fare” in group chats is really an aggressive sale fare, which is good news — those are safe to build a trip around. If a fare is 35% off and lasted overnight, it is a sale. A fourth thing gets mixed into the same conversation and is not a fare at all: hidden-city ticketing, which is legal but breaches your contract with the airline.
How a mistake fare actually happens
A published fare is not one number. It is a base fare, plus carrier surcharges, plus taxes for every jurisdiction it touches, assembled from data that passes through filing systems, distribution networks, currency conversions and sometimes a partner airline’s systems before it reaches a screen. Every one of those handoffs is a place a digit can move.
| Cause | What goes wrong | Typical signature |
|---|---|---|
| Currency conversion | A fare filed in one currency is read as another, or converted at a stale or inverted rate | A weirdly precise price, and only from one country’s point of sale |
| Missing surcharge | The carrier-imposed surcharge fails to attach to the base fare | Long-haul ticket priced like a short-haul one; taxes look normal |
| Wrong cabin loaded | An economy fare basis is filed against a business or first cabin | Premium seats at economy money — the most spectacular and most often cancelled kind |
| Third-party filing | A consolidator or online agency publishes a combination the airline never authorized | Only bookable through one obscure site, never on the airline’s own |
| Tax table gap | A jurisdiction’s taxes are missing from the calculation | Price is low but not absurd; often survives because it looks plausible |
This matters practically, because the cause predicts the outcome. A fare that is 40% low because a tax component went missing usually gets quietly honored — cancelling would cost more goodwill than the seats are worth. A first class ticket selling for a twentieth of its price because the wrong cabin was loaded is the one most likely to be pulled, particularly when it was filed by a third party rather than by the airline itself.
Do airlines have to honor mistake fares?
The short answer is no, and the rule that made it no has a date.
Following a widely reported February 2015 incident in which United sold tickets priced against Danish kroner as though they were dollars, the U.S. Department of Transportation issued a Mistaken Fare Policy Statement on 8 May 2015. It reversed the prior enforcement posture. An airline may now cancel a fare it identifies as a mistake, provided it meets two conditions:
- It refunds the ticket in full, with no cancellation penalty of any kind.
- It reimburses reasonable, actual and verifiable out-of-pocket expenses you incurred in reliance on the purchase — nonrefundable hotel bookings, connecting flights on separate tickets, visa and vaccination fees.
That second condition is more useful than most travelers realize. It is also why the reimbursement claim has to be documented: “actual and verifiable” means receipts, and it means costs you can show you would not have incurred otherwise.
The 24-hour rule is a different rule
Separately, DOT rules require carriers selling tickets to and from the United States to permit free cancellation within 24 hours of booking, on tickets bought at least seven days before departure. That is your rule, not the airline’s, and it works in your favor here: it means booking a suspected mistake fare costs you nothing for the first day even if you change your mind.
What the policy does not give you
There is no right to fly. Nothing in the 2015 policy obliges an airline to carry you at the mistaken price, and there is no appeal that produces a ticket. Book on the assumption that you might be refunded, and everything after that is upside.
Mistake fares that actually happened
A few of the cases that shaped how this is understood. Outcomes are as reported at the time.
| Airline | The fare | Outcome |
|---|---|---|
| United, Feb 2015 | Fares priced against Danish kroner as though they were dollars | Cancelled. The episode directly preceded the DOT’s May 2015 policy statement. |
| Cathay Pacific, Jan 2019 | Business class from Vietnam to New York for roughly $675 against a normal price near $16,000 | Honored |
| Norwegian, mid-2010s | Sub-£200 transatlantic economy and sub-£400 premium economy | Honored after initial confusion |
| Delta | Domestic round trips such as Cincinnati to Salt Lake City for $48 against a normal price above $400 | Honored |
| ANA, 2023 | First and business class round trips near $300, sold through a third-party site | Cancelled and refunded some months later |
The pattern across these is not subtle. Economy fares filed by the airline itself tend to be honored. Premium cabins sold at a fraction of cost through a third party tend not to be. And the delay before a decision can be long — the ANA tickets were not resolved for months, which is exactly why the advice about hotels below matters.
How to tell a mistake fare from a good sale
You will rarely need to make this call from scratch, because by the time a fare reaches you it has usually been assessed. But the signals are worth knowing.
Signs it is a mistake rather than a sale
- The discount is implausible. Anything more than about 70% off a route’s normal price is not a marketing decision.
- The routing makes no commercial sense. Mistake fares often appear on obscure origin cities, because that is where filing errors hide longest.
- It is only bookable one way in. A fare available on exactly one online agency and nowhere else is a distribution error.
- The taxes look wrong relative to the fare. If taxes and fees exceed the base fare by a wide margin on a long-haul ticket, a surcharge has probably gone missing.
- There is no marketing around it. Real sales come with a campaign. Mistake fares arrive in silence.
The ten-minute booking protocol
You have hours, not days, and the order of operations matters. This is the sequence.
- Book first, research second. Nothing you learn in the next twenty minutes is worth losing the fare over. The 24-hour cancellation rule means an unwanted booking costs you nothing.
- Book directly with the airline if the fare exists there. Direct bookings are honored more often, and if something goes wrong you are dealing with the party that can fix it rather than an agency that cannot.
- Use a credit card with real dispute protection. Not a debit card. If the ticket is cancelled and the refund stalls, the chargeback is your leverage.
- Book the simplest possible itinerary. Fewer segments, no add-ons, no seat selection, no bags. Complexity gives an airline more reasons to unwind the booking.
- Screenshot everything. The fare display, the price breakdown, the confirmation page, the email. If you later claim out-of-pocket costs, this is the evidence.
- Do not call the airline. There is no version of that conversation where an agent guarantees you anything, and there is a version where you flag the booking to the department that cancels it.
- Book one itinerary per traveler group, not ten speculatively. Mass speculative booking is what gets bookings voided on grounds unrelated to the fare error.
One extra check worth ninety seconds
Confirm the ticket has actually been issued, not just reserved. A reservation is a held seat; a ticket has a 13-digit number and shows up in your frequent flyer account. Unissued reservations are the easiest thing in the world for an airline to drop.
The two weeks after you book
This is where the money is won or lost, and the advice is boring: do nothing expensive.
The single most costly mistake travelers make with a mistake fare is booking nonrefundable accommodation the same evening. If the airline cancels three weeks later, you are entitled to claim that cost back under the DOT policy, but you are entering a documented claims process with a company that would rather not pay it, and you are doing so for money you did not need to spend.
- Wait about two weeks before treating the trip as real. Most cancellations happen inside that window.
- Check that the flights appear in your frequent flyer account. That is the strongest available signal the ticket has settled.
- If you must book accommodation, book free-cancellation rates only. The premium over a prepaid rate is the cheapest insurance you will ever buy.
- Do not book connecting flights on separate tickets until the main ticket is settled.
- Do not tell the airline you think it was an error. You are not obliged to audit their pricing for them.
If the airline cancels it
If it happens, the process is more mechanical than it feels.
- Confirm the refund is complete. Full ticket price, no penalty, back to the original payment method. Anything less is worth disputing immediately.
- Total your verifiable out-of-pocket costs. Nonrefundable accommodation, separately ticketed flights, visa fees, vaccination costs. Not the value of the trip, and not your time.
- Claim in writing, with receipts attached. Email or the carrier’s written complaints channel, not the phone. Cite the reliance costs plainly and quote the amount.
- If the airline refuses, escalate to the DOT. The Department’s aviation consumer protection office takes complaints, and carriers respond to them differently than to individuals.
- Take the goodwill offer if it is fair. Airlines sometimes offer miles or a voucher instead of a fight. Whether that beats a documented claim depends on the numbers, so do the arithmetic before answering.
Are mistake fares disappearing?
Rarer and shorter-lived, but not extinct, and the reasons are structural.
Airlines now run automated fare audits that flag anomalies within hours rather than days, and the 2015 DOT policy removed the regulatory pressure that used to make honoring a mistake the path of least resistance. A fare that would have stayed live for a day in 2013 gets pulled before lunch now.
What has not changed is the underlying complexity. Fares still pass through currency conversions, tax tables, interline agreements, third-party filing agents and partner reservation systems. Every one of those is still a place a decimal point can move, and no amount of auditing removes the handoffs. The realistic expectation is a handful of genuinely spectacular fares a year, each alive for a few hours, which is precisely the shape of thing you cannot catch by searching.
Are they worth chasing at all?
Honestly: they are worth being told about and not worth organizing your life around.
A mistake fare is a lottery ticket with good odds — roughly 70% by industry estimates — and a bounded downside, since the worst realistic outcome is a refund plus some wasted enthusiasm. That is a good trade as long as you keep the downside bounded, which is what the two-week rule above is for.
But they are not a travel strategy. Most cheap flying comes from the unglamorous things: watching more than one airport, being flexible about where you go, and buying inside the window for your region. The full playbook for finding cheap flights covers those, and they will save you more money over a decade than every mistake fare you ever catch.
Catch one anyway. There is nothing else in consumer travel that feels quite like paying $280 for a seat that costs $2,000, and the story outlives the trip.
Frequently asked questions
Short, direct answers to the questions people actually type. If yours is not here, the guides linked below probably cover it.
What is a mistake fare?
A mistake fare, also called an error fare or glitch fare, is an airline ticket sold at a price the airline never intended to publish. It is caused by a filing or systems error, such as a currency conversion applied at the wrong rate, an omitted fuel surcharge or a missing tax component. Mistake fares typically run 60% to 95% below a route's normal price and are usually corrected within a few hours.
Do airlines have to honor mistake fares?
No. In the United States, a Department of Transportation policy statement issued on 8 May 2015 permits an airline to cancel a fare it identifies as mistaken, reversing the earlier expectation that published fares had to be honored. The airline must refund the ticket in full and reimburse reasonable, actual and verifiable out-of-pocket expenses you incurred in reliance on the purchase.
How often are mistake fares honored?
Industry estimates put it around 70%. Outcomes vary by carrier and by how large the error was. A fare that is 40% off is often quietly honored because cancelling costs more goodwill than the seats are worth. A first or business class ticket selling for a twentieth of its price is far more likely to be pulled, especially if it was filed by a third party rather than the airline itself.
Is it illegal to book a mistake fare?
No. Buying a publicly published fare at the price displayed is not illegal, and travelers are not penalized for it. The risk is commercial, not legal: the airline may cancel the ticket and refund you. Booking dozens of speculative tickets under different names, or using the fare as part of a resale scheme, is a different matter and can breach a carrier's conditions of carriage.
How do I find mistake fares?
Realistically, you subscribe to something that watches for you. Mistake fares last hours and appear without warning on routes nobody was searching, so finding one manually requires being in the right search at the right minute. Alert services and deal communities exist because monitoring thousands of routes continuously is the only method that works.
Should I book a hotel after booking a mistake fare?
Not immediately, and not on a nonrefundable rate. Wait until the reservation has been ticketed, the flights appear in your frequent flyer account and roughly two weeks have passed without contact from the airline. If you must lock in accommodation, use a free-cancellation rate. Reimbursement for a cancelled fare is possible but slow, and it requires receipts and a claim.
What happens if the airline cancels my mistake fare?
You are refunded in full, typically within a few weeks, and under the 2015 DOT policy you may claim reasonable, actual and verifiable out-of-pocket costs you incurred relying on the ticket. Some airlines offer a goodwill gesture such as a voucher or miles instead of an argument. Keep every receipt and confirmation, and file the claim in writing rather than by phone.
Should I call the airline to confirm a mistake fare?
No. A phone call flags the booking to the one department capable of cancelling it, and the agent cannot promise you anything binding anyway. Book online, take a screenshot of the fare and the confirmation, and wait. The only reason to call is if you need to correct a passenger name, and even then it is worth waiting a few days.
What is the difference between a mistake fare and a sale fare?
A sale fare is intentional. An airline discounts seats it expects to struggle to fill, usually 15% to 40% off, on a defined date range, and it always honors the ticket. A mistake fare is unintentional, far deeper, appears without a marketing campaign, and can be cancelled. Sale fares are safe and modest; mistake fares are spectacular and conditional.
Are mistake fares disappearing?
They are getting rarer and shorter-lived, not extinct. Airlines now run automated fare audits that catch anomalies within hours instead of days, and the 2015 DOT policy removed the pressure to honor them. But fares still pass through currency conversions, tax tables, third-party filing agents and partner systems, and every one of those is a place a decimal point can move.
Sources
Every figure on this page traces to one of these. Airfare data moves, so each source is dated by its publisher — check the original before quoting a number a year from now.
- Mistaken Fare Policy Statement (May 2015) — U.S. Department of Transportation
- Airline refunds and the 24-hour rule — U.S. Department of Transportation
- The comprehensive guide to canceled mistake fares — The Points Guy
- Is the era of the airline mistake fare over? — Upgraded Points
- How to find and book airline mistake fares — SmarterTravel