How to File a Complaint With the Department of Transportation

Where to file your complaint and what form to use

The Department of Transportation's Aviation Consumer Protection Division handles complaints about airlines. You file through their online form at airconsumer.dot.gov, which is the only place DOT accepts new complaints. You can also mail a written complaint to the DOT's Aviation Consumer Protection Division at 1200 New Jersey Avenue SE, Washington, DC 20590, but the online form is faster and tracks your case automatically.

The form itself is straightforward: you describe what happened, name the airline, provide your confirmation number or ticket number, and list the dates involved. You do not need a lawyer, and you do not need to have contacted the airline first, though DOT will ask whether you did. The form takes about 10 to 15 minutes to complete if you have your flight documents in front of you.

DOT does not charge a fee to file. Once you submit, you receive a complaint number immediately. That number is how you track your case and how DOT refers back to you.

Key Takeaways

• File your complaint at airconsumer.dot.gov using the online form, which is the official channel DOT uses to track and investigate airline complaints.
• You will need your flight confirmation number, ticket number, the airline name, and the dates of your flight to complete the form.
• DOT forwards your complaint to the airline, which has 30 days to respond; you can see their response in your online account.
• DOT does not resolve individual complaints or force refunds, but complaints are tracked publicly and used to identify patterns of airline violations.
• Keep copies of your boarding pass, receipt, and any written communication with the airline, because DOT may ask for these to investigate.

What information you need before you start

Gather your flight documents before opening the form. You need the airline name, your confirmation number (the six-character code on your receipt or email), your ticket number, and the date of the flight. If you have a boarding pass, that contains most of this information in one place.

You should also have a clear description of what went wrong. Write it out first if you need to—DOT's form has a text box for your complaint, and being specific helps. Instead of "the flight was delayed," write "the flight departed 4 hours late with no explanation given at the gate, and the airline did not provide meals or hotel accommodations." The more detail you provide, the more useful your complaint is to DOT's investigators.

If you paid out of pocket for meals, hotels, or other expenses because of the delay or cancellation, note those amounts and keep the receipts. DOT does not reimburse you directly, but the complaint record shows the airline what costs their actions created.

How DOT processes your complaint after you file

After you submit, DOT logs your complaint and assigns it a number. Within a few business days, DOT forwards your complaint to the airline's customer service department. The airline then has 30 days to respond to you directly. You will see their response in your online account at airconsumer.dot.gov when it arrives.

DOT does not investigate every complaint individually. Instead, DOT staff review complaints to identify patterns—if one airline receives dozens of complaints about the same issue, that triggers a formal investigation. Your single complaint contributes to that pattern, even if DOT does not contact you about it.

The airline's response is often a form letter, sometimes with a voucher or small credit. If you disagree with their response or they do not respond within 30 days, you can file a follow-up complaint. DOT tracks these patterns too.

What DOT can and cannot do for you

DOT does not force airlines to pay you money or issue refunds. DOT does not have the power to overturn an airline's decision or reverse a cancellation. What DOT does is create an official record of your complaint, investigate patterns of violations, and take enforcement action against airlines that break federal rules repeatedly.

If an airline violated a specific regulation—for example, failing to provide a refund for a cancelled flight when required by law—DOT can fine the airline. Those fines come from patterns in complaints, not from individual cases. Your complaint is part of the evidence DOT uses to identify which airlines are breaking the rules most often.

If you want money back for a cancelled flight or a delay, you may have other options: disputing the charge with your credit card company, filing a claim in small claims court, or contacting your state's attorney general's office. A DOT complaint does not replace those steps, but it creates a public record that strengthens your case if you pursue them.

When to file and how long it takes

You can file a complaint at any time, but DOT recommends doing it within 60 days of the flight. There is no hard deadline, but the closer to the event, the easier it is for DOT and the airline to investigate. If you file months later, the airline may say they cannot locate records.

The process itself takes time. The airline has 30 days to respond. If you then file a follow-up complaint or dispute their response, that adds another 30 days. In total, expect the complaint cycle to take 60 to 90 days from the time you file until you see a final response from the airline.

DOT does not give you a timeline for any enforcement action they might take. If your complaint is part of a pattern that triggers an investigation, that investigation can take months or years. You will not receive updates on that process unless you check the DOT website for news about enforcement actions against that airline.

What to include in your complaint to make it stronger

Be specific about what happened and when. Instead of "bad service," describe the actual event: "Flight 447 from Denver to Chicago was cancelled at 6 p.m. with no advance notice. The airline reboked me on a flight the next morning. I was not offered a hotel or meal voucher." Include the gate number, the time you were notified, and the names of any airline staff you spoke with if you remember them.

Describe the impact on you. Did you miss a connection? Did you have to pay for a hotel yourself? Did you miss a job interview or a family event? DOT uses this information to understand the real cost of airline failures. It does not change whether DOT investigates, but it creates a complete record.

Attach or reference any documents you have: a photo of the departure board showing the cancellation, an email from the airline, a receipt for a hotel you paid for yourself. You can upload files directly in the DOT form. These documents give DOT concrete evidence to review.

How to track your complaint and follow up

After you file, you receive a complaint number. Go back to airconsumer.dot.gov and use that number to log in and check the status of your complaint. You can see when DOT forwarded it to the airline and when the airline responded. This is your only way to track progress—DOT does not send email updates.

If the airline does not respond within 30 days, you can file a follow-up complaint noting that they missed the deadline. If their response does not address your issue or you disagree with it, you can also file a follow-up. There is no limit to how many times you can file about the same flight, though filing multiple complaints about the same issue may not change the outcome.

If you believe the airline violated a specific federal rule, you can mention that rule in your complaint. For example, if a flight was cancelled and the airline did not offer a refund, you can cite 14 CFR Part 259, which covers airline customer service rules. Naming the rule helps DOT's staff understand what violation you are reporting.

Frequently Asked Questions

Do I have to contact the airline before I file a DOT complaint?

No. You can file a DOT complaint without contacting the airline first. However, if you have already contacted them and they refused to help or did not respond, mention that in your complaint. It shows DOT that you tried to resolve it directly.

Will DOT give me a refund or compensation?

No. DOT does not issue refunds or compensation to individual passengers. DOT's role is to investigate patterns of violations and fine airlines that break federal rules. If you want compensation, you will need to pursue it through your credit card company, small claims court, or your state's attorney general.

What happens if the airline ignores the DOT complaint?

If the airline does not respond within 30 days, you can file a follow-up complaint noting the missed deadline. Repeated failures to respond to DOT complaints can trigger an investigation into that airline's customer service practices.

Can I file a complaint about a flight that happened months ago?

Yes, but DOT recommends filing within 60 days. The closer to the event, the easier it is for the airline to locate records and investigate. If you file much later, the airline may say they cannot find documentation.

What if multiple passengers were affected by the same flight cancellation?

Each passenger files their own complaint. You do not need to coordinate with other passengers, though DOT's system will see that multiple complaints came from the same flight. That pattern helps DOT identify systemic problems with that airline.