How to File a DOT Complaint Against an Airline (2026 Steps)

File your airline complaint in writing at the US Department of Transportation’s online form: secure.dot.gov/air-travel-complaint. That is the correct portal, run by DOT’s Office of Aviation Consumer Protection. A complaint has to be submitted in writing to be processed, so a phone call alone does not count. Once you file, DOT forwards your complaint to the airline, and the airline is required to respond by a set deadline.

Here is the part most people get wrong before they even start. A DOT complaint is not a small-claims court and it will not mail you a check. What it does is put your dispute on the federal record, force the airline to answer, and feed the enforcement system DOT uses to fine carriers that break the rules. In practice, that pressure is often what finally moves a refund the airline had been sitting on.

This page lays out the exact filing steps, the response timeline you can hold the airline to, which complaints go to DOT versus TSA or the FAA, and the honest limits of what a complaint can do. Details here are drawn from DOT’s own consumer-protection guidance, verified September 2026. Confirm the current process at transportation.gov before you file.

Step 1: Try the Airline First

DOT expects you to give the airline a chance to fix the problem before you file. If you are still at the airport, deal with it at the counter, where a customer-service agent can rebook you, arrange a hotel, or issue a refund on the spot. If you are already home, use the carrier’s customer-relations or refunds department in writing, by email or the web form, so you have a dated record.

Keep every reply they send. If the airline refuses, stalls, or ignores you, that paper trail becomes the core of your DOT complaint. A complaint that shows “I asked the airline on this date and got this answer” is far stronger than one that opens the dispute cold.

There is one exception worth naming. You do not have to exhaust the airline’s process forever. If the carrier is clearly violating a rule, such as pushing a voucher when the automatic refund rule entitles you to cash back, you can file with DOT once you have made a documented request and been refused.

Step 2: Gather What the Form Asks For

The online form is short. Have these ready before you start so you can finish in one sitting:

• Your full name and contact details, including a mailing address, email, and phone number.
• Your flight information: airline, flight number, date, and route.
• A description of what happened, up to 1,000 characters. If you need more room, attach a letter as a document.
• Supporting files: your itinerary, receipts, boarding passes, and any email exchange with the airline.

Write the description in plain, dated order. State what the airline did, what you asked for, and what rule you believe it broke, if you know one. You do not need legal language. You need facts and dates.

Step 3: File at secure.dot.gov/air-travel-complaint

Go to secure.dot.gov/air-travel-complaint and complete the form. This is the same complaint form linked from transportation.gov/airconsumer, so both paths land in the same place. Submit it in writing. A complaint has to be in writing to be processed as a formal complaint rather than a general inquiry.

Prefer paper? You can mail it instead, to the Office of Aviation Consumer Protection, U.S. Department of Transportation, 1200 New Jersey Avenue SE, Washington, DC 20590. The online form is faster and gives you a confirmation record, so use it unless you have a reason not to.

Step 4: Know the Timeline You Can Hold Them To

Once DOT forwards your complaint, the airline is on a clock. Under DOT’s customer-service rules, the carrier has up to 30 days to acknowledge your complaint and up to 60 days to send a substantive response. The airline responds to both you and DOT, and DOT reviews the complaint alongside the airline’s answer to decide whether a violation occurred.

Stage	Deadline	Who acts
Airline acknowledges the complaint	Within 30 days	Airline
Airline sends a substantive written response	Within 60 days	Airline
DOT reviews complaint plus airline response	No fixed public deadline	DOT

If the 60 days pass with no real answer, that silence is itself useful. It shows a pattern, and DOT logs every complaint into the data it publishes and uses when it decides which carriers to investigate and fine.

File With the Right Agency

Not every airline problem goes to DOT. Sending a security gripe to DOT or a service gripe to the FAA just delays you. Match the problem to the agency:

Your problem	File with	Contact
Delays, cancellations, refunds, bumping, baggage, disability, discrimination, ticketing, loyalty programs	DOT Office of Aviation Consumer Protection	secure.dot.gov/air-travel-complaint
Airplane or airline safety, emergency-exit seating, pilot licensing	Federal Aviation Administration	1-866-835-5322 (1-866-TELL-FAA)
Screening, the no-fly list, checkpoint or baggage-screening conduct	Transportation Security Administration	1-866-289-9673

Most passenger disputes, the money and service ones, belong to DOT. Safety and security are the two carve-outs.

What a DOT Complaint Can Actually Do

Set your expectations honestly, because this is where people get frustrated. Filing does three real things:

1. It forces a response. The airline has to answer you and DOT inside the 30 and 60-day deadlines, which is more than most customer-relations queues promise.
2. It pressures the airline. Airlines track their DOT complaint counts closely. Telling a stalling refunds agent that you have filed, or are about to file, a DOT complaint often unsticks a case that was going nowhere, because a documented federal complaint is not something the airline wants added to its record.
3. It feeds enforcement. DOT does not litigate your individual case, but it uses the complaint record to open investigations and levy fines against carriers that break the rules. Your one complaint is a data point in that larger picture.

Here is the caveat, and it matters: DOT will not act as your personal lawyer or guarantee you a payout. If your real goal is to recover a specific dollar amount the airline refuses to pay, a complaint may pressure them into it, but a credit-card chargeback or small-claims court is the tool that actually forces money back. Use the DOT complaint alongside those, not instead of them.

The Rules Worth Citing in Your Complaint

A complaint lands harder when you name the rule the airline broke. Two current federal rules cover most disputes.

The automatic refund rule. As of the 2024 DOT refund rule, still in effect in 2026, US airlines must give you an automatic refund to your original form of payment, not a voucher, when they cancel or significantly change your flight and you do not accept the rebooking. The refund is due within 7 business days for credit-card purchases and 20 calendar days for other payment methods. “Significant change” has a defined meaning:

Change	Triggers a refund
Departure or arrival time moves by more than 3 hours (domestic) or 6 hours (international)	Yes
Departure or arrival switches to a different airport	Yes
The itinerary adds one or more connections	Yes
You are downgraded to a lower class of service	Yes
You are moved to a plane less accessible for a disabled passenger	Yes
The airline only changes the flight number	No, on its own

That last row reflects a DOT clarification from December 2025: a flight-number change by itself is not a significant change and does not entitle you to a refund unless it also crosses one of the thresholds above. The same 2024 rule also requires airlines to refund a checked-bag fee if your bag is not delivered within 12 hours of a domestic flight arriving, or 15 to 30 hours for an international flight depending on length, and to refund any extra you paid for a service the airline did not provide, such as wifi that never worked.

What US airlines do not owe you. There is no US federal rule requiring an airline to pay you cash for a delay itself. A proposed DOT rule that would have required cash compensation for long, airline-caused delays was withdrawn in late 2025, so as of 2026 it is not law. Do not cite it in a complaint. For a controllable delay you can still claim rebooking, and meals or a hotel per the airline’s own commitments, but not a guaranteed cash payment. The European “up to 600 euros” rule people quote is EC 261, and it does not apply to a US domestic flight.

FAQ: Filing a DOT Complaint

What is the correct website to file a DOT airline complaint?

File at secure.dot.gov/air-travel-complaint, the online form run by DOT’s Office of Aviation Consumer Protection. It is the same form linked from transportation.gov/airconsumer. The complaint must be submitted in writing to be processed, so use the web form or mail rather than relying on a phone call.

How long does a DOT complaint take?

The airline has up to 30 days to acknowledge your complaint and up to 60 days to send a substantive response, under DOT’s customer-service rules. DOT then reviews your complaint against the airline’s answer. There is no fixed public deadline for DOT’s own review, so plan for the process to run a couple of months rather than days.

Will filing a DOT complaint get my money back?

Sometimes, indirectly. A complaint forces the airline to respond and adds your case to the federal record, which often pressures a stalling airline into paying. But DOT does not act as your lawyer or order a payout in your individual case. If you need a specific refund the airline refuses to give, pair the complaint with a credit-card chargeback or small-claims filing, which can actually force the money back.

Do I have to contact the airline before filing with DOT?

Yes, in almost every case. DOT expects you to give the airline a chance to resolve the problem first, and a documented request that the airline refused makes your complaint much stronger. The exception is a clear rule violation, such as an airline pushing a voucher when the automatic refund rule owes you cash, where you can file once you have asked in writing and been turned down.

What complaints go to DOT versus TSA or the FAA?

DOT’s Office of Aviation Consumer Protection handles service issues: delays, cancellations, refunds, bumping, baggage, disability, discrimination, ticketing, and loyalty programs. Airline or aircraft safety concerns go to the FAA at 1-866-835-5322. Screening, the no-fly list, and checkpoint conduct go to the TSA at 1-866-289-9673.

Is a flight number change enough to get a refund?

No, not by itself. DOT clarified in December 2025 that renumbering a flight is not a significant change and does not entitle you to a refund. You are owed an automatic refund only if the change also moves your departure or arrival by more than 3 hours domestically or 6 hours internationally, switches airports, adds a connection, or downgrades your class of service.