✦ Company complaint letter guide
United Airlines complaint letter: delays, refunds and baggage
Create a clear, evidence-led United Airlines complaint letter for a flight delay, cancellation, refund dispute, baggage issue, accessibility failure or unresolved response.
Choose the problem
Start with the United Airlines issue that matches your complaint
Airline complaints work best when the letter separates the journey problem, evidence and requested remedy.
Flight delay compensation
Use this when a flight arrived late and you want compensation, expenses or a written explanation.
Start this complaint →Cancelled flight or rerouting
Use this when a flight was cancelled, the replacement was unsuitable, or you were left with extra costs.
Start this complaint →Refund not received
Use this when a refund is delayed, refused, unclear or not returned to the expected payment method.
Start this complaint →Baggage lost or damaged
Use this for delayed baggage, missing bags, damaged luggage, replacement essentials or poor baggage handling.
Start this complaint →Accessibility or assistance failure
Use this where requested assistance, mobility support, communication or reasonable adjustments failed.
Start this complaint →Poor complaint response
Use this when you have a case reference but the answer is incomplete, delayed or ignores your evidence.
Start this complaint →Complaint route
How an airline complaint should progress
Start with a written complaint to the airline. If it remains unresolved, the next route depends on the airline, the complaint type and the relevant ADR scheme.
Complain to the airline first
Send a structured written complaint with booking reference, flight number, dates, evidence and the outcome requested.
Chase the response
If there is no meaningful response after a reasonable period, chase and ask when a substantive reply will be provided.
Escalate if unresolved
If there is a final response or the sector escalation threshold has passed, consider the relevant aviation ADR route if the complaint is in scope.
Check the airline complaint page before escalating, because the correct ADR body can differ by airline.
Evidence checklist
What to include for each United Airlines complaint type
Use the checklist to make the letter specific enough for the company to investigate and respond.
| Complaint type | Evidence to include | Likely outcome to request |
|---|---|---|
| Flight delay compensation | Booking reference, flight number, route, scheduled and actual arrival time, reason given and receipts. | Compensation assessment, expenses and written explanation. |
| Cancelled flight or rerouting | Cancellation notice, replacement flight offered, rerouting details, hotel or transport costs. | Refund, rerouting cost, expenses or explanation. |
| Refund not received | Booking confirmation, payment proof, refund request, dates chased and company response. | Refund to original payment method, confirmation and timescale. |
| Baggage lost or damaged | Bag tag, PIR reference if available, photographs, receipts and correspondence. | Repair, replacement, reimbursement or settlement review. |
| Accessibility or assistance failure | Assistance request, date, airport, staff contact, impact and previous response. | Apology, investigation, service review and practical remedy. |
| Poor complaint response | Complaint reference, dates chased, responses received and unresolved points. | Substantive reply, escalation, final response or review. |
- Evidence to include
- Booking reference, flight number, route, scheduled and actual arrival time, reason given and receipts.
- Likely outcome to request
- Compensation assessment, expenses and written explanation.
- Evidence to include
- Cancellation notice, replacement flight offered, rerouting details, hotel or transport costs.
- Likely outcome to request
- Refund, rerouting cost, expenses or explanation.
- Evidence to include
- Booking confirmation, payment proof, refund request, dates chased and company response.
- Likely outcome to request
- Refund to original payment method, confirmation and timescale.
- Evidence to include
- Bag tag, PIR reference if available, photographs, receipts and correspondence.
- Likely outcome to request
- Repair, replacement, reimbursement or settlement review.
- Evidence to include
- Assistance request, date, airport, staff contact, impact and previous response.
- Likely outcome to request
- Apology, investigation, service review and practical remedy.
- Evidence to include
- Complaint reference, dates chased, responses received and unresolved points.
- Likely outcome to request
- Substantive reply, escalation, final response or review.
Outcome request
What you can ask United Airlines to do
The strongest complaint letters state the practical result you want, not just what went wrong.
Use this page to craft a clear, firm complaint letter to United Airlines. Set out what happened, what you want United Airlines to do, and include the right evidence so your case can be assessed promptly.
What this letter should achieve
- Explain what went wrong and when.
- Describe the impact on your travel plans and costs.
- State the remedy you are seeking (for example, refund, reimbursement, or a clear explanation).
- Request a written response within a reasonable timeframe.
- Indicate that you will escalate the complaint if it is not resolved.
Common issues people complain about
People commonly raise the following with United Airlines:
- Delay / cancellation
- Refund
- Baggage issue
- Compensation query
What to include
- Your booking reference and passenger names as shown on the ticket.
- Flight number(s), travel dates, and route(s).
- A concise, chronological account of what happened and any conversations.
- Receipts for reasonable expenses and any out-of-pocket costs.
- Screenshots of notifications and messages from the app, email, or SMS.
- Copies of any written correspondence with United Airlines or third parties.
- The specific outcome you want and why it is fair.
Evidence: Booking reference, flight number(s), travel dates, receipts, screenshots of notifications, and any written correspondence.
Escalation and timeframes
Allow the airline time to investigate; escalate if you receive a deadlock response or prolonged non-response.
If the matter remains unresolved after the airline’s process, consider the relevant ADR/aviation dispute route. In the UK context, guidance is available from the Civil Aviation Authority (CAA). Check whether an approved ADR scheme is available for your flight before you submit an escalation.
Practical tips
- Keep your letter concise, factual, and polite; avoid emotive language.
- Attach copies of documents (not originals) and redact sensitive card details.
- Number your attachments and reference them in the body of your letter.
- Send your complaint via a trackable channel and keep a full record.
- Itemise expenses with dates, amounts, currency, and receipts.
- Check United Airlines’ policies and your travel insurance for relevant coverage.
- If you had connections, explain how the disruption affected each leg of the journey.
United Airlines complaint FAQs
How long should I give United Airlines to respond?
What should I attach as evidence?
What if they do not reply or refuse to resolve it?
How do I structure a complaint about: Delay / cancellation?
How do I structure a complaint about: Refund?
Related guidance
Useful next pages
Use these pages to compare complaint routes, prepare evidence and start a letter for another company.
Airlines complaints
Browse other companies and complaint routes in this sector.
Open sector → GuideHow to Complain to an Airline (UK Consumer Rights Guide)
Learn how to complain to an airline in the UK, claim refunds or compensation, gather evidence, and escalate unresolved disputes effectively.
Read guide → GuideThe 2026 UK Consumer Complaint Index
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Read guide → CompaniesFind another company
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Browse companies → ToolComplaint letter generator
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Open company → GuideWhy most UK refund complaints fail and how to fix them (2026 guide)
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