Which US airline has the most DOT complaints per 100,000 passengers in 2026?

Frontier at 23.4 per 100,000, followed by Spirit at 21.9. Both dominate the complaint chart due to denial-first claim strategies and opaque fee structures.

Which airline has the fewest DOT complaints?

Hawaiian at 1.5 per 100,000, Alaska at 1.7, and Delta at 2.0. All three pay most eligible claims without passenger escalation.

Does filing a DOT complaint work?

Yes. 72 percent of refund-related DOT complaints resolve in passenger favor. 58 percent of delay/cancel complaints resolve favorably.

How long does a DOT complaint take?

Airline must respond within 30 days. Full resolution typically 60 to 90 days. Enforcement actions against airlines (fines) can take 12+ months but do not affect your individual case.

Does a DOT complaint help if the airline is foreign?

Yes if the flight was US-departing or US-arriving. DOT has jurisdiction over all flights touching US airports regardless of airline nationality.

Should I file DOT complaint or chargeback first?

File the airline refund request first. If not paid in 7 business days (DOT statutory deadline), file chargeback. File DOT complaint at day 10 for regulatory enforcement.

Can DOT award me compensation directly?

DOT enforcement fines go to Treasury, not passengers. But DOT pressure usually results in settlement by the airline directly with the passenger.

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Compensation TipsApril 21, 2026•7 min read

Airline Complaint Rankings by the DOT

DOT publishes monthly airline complaint counts normalized per 100,000 passengers. In 2026 YTD, Frontier and Spirit lead with over 20 complaints per 100K. Here is the full leaderboard and what it signals.

The 2026 Complaint Rate Leaderboard

Airline complaint rankings by the DOT (2026 YTD, complaints per 100,000 passengers):

›
Frontier: 23.4 complaints per 100K.
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Spirit: 21.9.
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Allegiant: 14.1.
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JetBlue: 11.8.
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American: 6.7.
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United: 5.4.
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Southwest: 3.1.
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Delta: 2.0.
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Alaska: 1.7.
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Hawaiian: 1.5.

Frontier's rate is 15x Hawaiian's. A Frontier passenger is 15 times more likely to file a DOT complaint than a Hawaiian passenger.

What Passengers Complain About (2026 Mix)

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Flight delays and cancellations: 38 percent.
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Refund disputes: 31 percent.
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Baggage: 13 percent.
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Customer service interactions: 8 percent.
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Reservation and ticketing: 5 percent.
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Disability and accessibility: 3 percent.
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Discrimination: 1 percent.
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Other: 1 percent.

Why ULCCs Dominate the Complaint Chart

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Denial-first claim strategy: triggers escalation.
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Opaque refund processes: baggage fees, seat fees, booking fees.
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Low-empowerment first-line agents: everything escalates.
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Aggressive schedule changes: fewer protective policies.
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Limited duty of care: fewer meal/hotel vouchers on delays.

DOT Complaint Success Rate

When passengers file DOT complaints, the outcome depends on the airline:

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Refund-related complaints: 72 percent resolve in passenger favor.
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Delay/cancel complaints: 58 percent resolve in passenger favor.
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Baggage complaints: 61 percent.
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Frontier and Spirit: ~78 percent of DOT refund complaints resolve in passenger favor.
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Delta, Alaska: ~90 percent resolve without DOT complaint being needed.

Filing a DOT Complaint

1
File at [secure.dot.gov/air-travel-complaint](https://secure.dot.gov/air-travel-complaint).
2
Attach: boarding pass, screenshots of delay, airline correspondence, refund request.
3
Use specific language: cite 14 CFR 259.5 for refunds, or specific Part 250 for denied boarding.
4
Expect airline response within 30 days (DOT requires).
5
Resolution typically 60 to 90 days.

Related Rankings

See best US airports for on-time performance, which airline denies claims most often, and airline rankings and comparison thanksgiving edition.

Pillar Link and Authority Sources

For the pillar see Airline Rankings and Comparison. For primary data see DOT Air Travel Consumer Reports and DOT Complaint Portal.

TravelStacks files DOT complaints as part of the $19 flat DOT refund service. Start a claim in 30 seconds.

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