Under the U.S. Department of Transportation (DOT) Refund I final rule published in the Federal Register on December 5, 2025, airlines like Allegiant Air must provide prompt refunds for cancelled flights, significant delays, or significant changes when consumers choose not to travel. Airlines must also notify consumers of their refund entitlement. If Allegiant Air denied your refund after cancelling your flight, this DOT rule controls the issue for U.S. carriers. Credit card chargebacks or airline-specific policies do not override this legal requirement. Next, contact the airline citing the rule with your booking and payment proof; if denied, file a DOT complaint.
The Controlling U.S. DOT Refund Rule
The DOT Refund I final rule requires U.S. airlines and ticket agents to issue prompt refunds in cases of flight cancellations, significant delays, or significant changes where the consumer elects not to travel. This applies directly to Allegiant Air as a U.S. carrier. The rule also mandates that airlines notify consumers of their refund entitlement upon such events. It became effective following its 2025 publication.
A related DOT process, Refund III, involves redefining what counts as a cancelled flight, with an earliest decision date of June 30, 2026. Until then, the Refund I rule sets the current standard for refund obligations. This is a federal legal requirement, distinct from any voluntary airline policies.
For full details, see the Federal Register notice.
| Aspect | DOT Refund I Rule |
|---|---|
| Triggers | Flight cancellations, significant delays, significant changes (consumer chooses not to travel) |
| Requirement | Prompt refunds to consumers |
| Additional Duty | Notify consumers of refund entitlement |
| Scope | U.S. airlines like Allegiant Air |
| Status as of 2026 | Effective (Refund I); Refund III pending decision by June 30, 2026 |
What Does Not Control This Issue
The DOT Refund I rule covers refunds but does not mandate compensation for delays or cancellations--only refunds when applicable. A prior DOT proposal for delay compensation was withdrawn in 2025.
This issue falls outside EU/UK 261 passenger rights, travel insurance policies, bag fee refunds, or treatments like flight renumbering, which DOT does not classify as cancellations. Credit card billing disputes serve as a secondary option if you paid by credit card but do not replace the DOT-mandated merchant refund.
Practical Next Steps and Escalation
Gather evidence including your booking confirmation, payment receipt, Allegiant Air cancellation notice, and any denial correspondence. Contact Allegiant Air customer service, citing the DOT Refund I rule and requesting a refund to your original payment method.
If denied, file a complaint with the DOT Aviation Consumer Protection Division, including flight details, proof of payment, and airline communications. As a secondary option if paid by credit card, pursue a billing dispute with your card issuer, noting any applicable timelines.
Evidence Checklist
- Booking confirmation (flight number, dates, passengers)
- Payment receipt (amount, date, method)
- Airline cancellation notice or communication
- Refund denial response from Allegiant Air
- Timeline of events
FAQ
Does the DOT rule apply if Allegiant Air offers a voucher instead of a refund?
No; the rule requires refunds when the consumer chooses not to travel.
Can I get compensation for the cancellation?
No; DOT mandates refunds only, not compensation.
Is this rule fully in effect in 2026?
Yes for Refund I; Refund III (canceled flight definition) has an earliest DOT decision date of June 30, 2026.
What counts as a "significant delay" under DOT rules?
The primary rule covers significant delays but does not specify thresholds in the available official evidence.