To file a complaint against an airline with the US Department of Transportation, go to secure.dot.gov/air-travel-complaint and submit the online form. It's free, takes about 15 minutes, and the DOT forwards your complaint to the airline, which is legally required to respond within 60 days. Before you file, complain directly to the airline first and give them a chance to fix it — the DOT process works best as your escalation step, not your first move. Keep every receipt, email, and boarding pass, because documentation is what turns a complaint into a refund or credit.
When a DOT Complaint Is the Right Move
The DOT handles complaints about how airlines treat you under federal consumer-protection rules. It is the right tool when an airline has broken a rule or failed to honor its own contract of carriage. Common examples:
- The airline won't give you the refund you're owed. Under the 2024 DOT refund rule (fully in effect for 2026), airlines must automatically issue cash refunds — to your original payment method — when they cancel or significantly change your flight and you decline the alternative. "Significant" means a departure or arrival that shifts by more than 3 hours domestically or 6 hours internationally, a downgrade, a change of departure/arrival airport, or added connections. If they push a voucher on you instead of cash, that's a violation.
- They stalled on a refund past 7 days (credit card) or 20 days (cash/check). Those are the federal deadlines once a refund is owed.
- Denied-boarding compensation was withheld or shortchanged. Bumping compensation is federally mandated. See our full guide to denied boarding compensation for the exact dollar amounts.
- Lost, delayed, or damaged baggage claims were denied or lowballed. The DOT liability cap for domestic checked bags is $3,800.
- Disability accommodation, discrimination, or deceptive advertising problems.
A DOT complaint is not the right tool if you just want compensation for a weather delay or a mechanical delay where you still flew. The US has no equivalent of EU261 — there is no federal law forcing airlines to pay you cash for a delayed flight you eventually took. What airlines owe in those cases is whatever their contract of carriage promises (meals, hotel, rebooking) and, if you choose not to fly, a refund.
Step 1: Complain to the Airline First
The DOT expects you to have contacted the airline before escalating, and honestly, it's faster. Most refund disputes get resolved when you send a clear, dated, written request. Skip the phone if you can — you want a paper trail.
- Use the airline's online complaint form or send a message through its app. Delta, United, and American all have "Comment/Complaint" pages.
- State exactly what happened, what rule or policy applies, and what you want. Example: "My flight DL1234 on March 3 was canceled. I declined rebooking. Under the DOT refund rule I'm owed an automatic cash refund of $412 to my Visa. Please process it within 7 business days."
- Attach your confirmation number, boarding passes, and receipts.
- Save a copy of everything, including the timestamp.
Give the airline a reasonable window — usually about two weeks — to respond before you file with the DOT. If they deny you, ignore you, or offer a voucher when cash is owed, that response becomes evidence for your complaint.
Step 2: Gather Your Documentation
A vague complaint gets a vague answer. A specific, well-documented one gets action. Pull together:
- Your flight number, date, and confirmation/record locator
- Original ticket price and proof of payment (screenshot of the charge)
- Any cancellation, delay, or schedule-change notices the airline sent (emails and texts — these timestamp when the airline knew)
- Receipts for expenses you're claiming (meals, hotel, replacement clothing for a lost bag)
- Your correspondence with the airline and its response
- For baggage: the file reference number from the lost/delayed bag report you filed at the airport, plus photos of damage
If your bag was lost or delayed, file the property irregularity report at the airport before you leave and keep the receipt. Airlines routinely reject baggage claims that weren't reported on the spot.
Step 3: File the Complaint With the DOT
Go to the DOT Aviation Consumer Protection site and choose the online air travel complaint form. It's the fastest route. You'll enter:
- Your contact information
- The airline and flight details
- A description of what happened (be factual and chronological)
- What resolution you want
- Uploads of your supporting documents
You can also mail a complaint to the Office of Aviation Consumer Protection or call the consumer hotline, but the online form is easier to track. There's no fee, and you don't need a lawyer.
What happens next: the DOT logs your complaint and forwards it to the airline. Federal rules require the carrier to acknowledge your complaint within 30 days and send a substantive response within 60 days. The DOT reviews complaints for patterns and possible rule violations — a flood of similar complaints is how airlines end up fined. Filing also puts your case on the record even if the DOT doesn't act on your individual claim.
What the DOT Can and Can't Do for You
Be realistic. The DOT does not act as your personal collections agency and won't guarantee you a check. It enforces rules against airlines and can fine carriers for violations. But complaints frequently prompt the airline to settle with you directly, because carriers track their DOT complaint volume closely. Think of the DOT filing as pressure that makes the airline's customer-relations team take you seriously.
What You're Actually Owed Under US Rules
Knowing the real rules keeps your complaint sharp. Here's the quick reference for 2026:
| Situation | What you're owed |
|---|---|
| Airline cancels; you don't rebook | Automatic cash refund of the unused portion, original payment method |
| Significant delay/change (3h+ domestic, 6h+ intl); you decline | Automatic cash refund |
| Delay where you still fly | No federal cash comp; amenities per contract of carriage |
| Involuntary bump, 1–2h domestic delay | 200% of one-way fare, max $1,075 |
| Involuntary bump, over 2h domestic (4h intl) | 400% of one-way fare, max $2,150 |
| Lost/damaged checked bag (domestic) | Actual value up to $3,800 liability cap |
| Checked bag fee, bag never arrives | Refund of the bag fee |
One thing many travelers miss: if you paid for a service you didn't get — a checked bag that was lost, Wi-Fi that didn't work, a seat upgrade you were denied — you're owed that fee back. Southwest's policy shifted recently, so if that's your carrier, check what changed in the 2026 Southwest baggage policy before you claim.
After You File: Escalation Options
If the airline still won't budge after the DOT process, you have more levers:
- Credit card chargeback. If you were owed a refund and never got it, dispute the charge with your card issuer. This is often faster than any government process.
- Small claims court. For amounts under your state's limit (often $5,000–$10,000), you can sue the airline without a lawyer. Your DOT complaint and airline responses are useful evidence.
- Follow up with the DOT. If the airline blows past the 60-day response deadline, tell the DOT — that missed deadline is itself a violation.
If your problem started with a missed connection or a booking mix-up rather than an airline error, the fix may be different — our guide on what to do after a missed flight walks through those scenarios.
Frequently Asked Questions
How long does a DOT complaint take?
The airline must acknowledge your complaint within 30 days and provide a substantive written response within 60 days. The DOT's own review can take longer, since it looks for broader violation patterns rather than resolving each case individually. If you need money back quickly, pair your DOT complaint with a credit card chargeback.
Does filing a DOT complaint cost anything or require a lawyer?
No. The complaint is free and the online form is designed for regular travelers. You don't need a lawyer unless you later decide to sue in small claims court, and even then most people handle small claims themselves.
Can I file a DOT complaint for a delayed flight I still took?
You can file, but understand what's enforceable. The US has no law requiring cash compensation for delays where you complete the trip. Your complaint would be valid only if the airline failed to provide something it promised in its contract of carriage or denied a refund you were actually owed. For pure delay compensation, US rules simply don't match the EU.
What's the difference between a DOT complaint and a chargeback?
A chargeback goes through your credit card company and is the fastest way to get money back when you were owed a refund and never received it. A DOT complaint is a regulatory action that pressures the airline and helps the government enforce the rules. They're not mutually exclusive — using both at once is often the smartest play.