Start with two facts: you were booked or checked in, and the flight ran differently from its published schedule. Your booking record covers the first point. An airline alert, airport notice, or timing record may help with the second.

An airline delay confirmation is often the clearest single record, but it isn't required for every claim. The rule behind your request matters. A U.S. refund, an EU261 claim, an insurance claim, and an airline-policy request may need different records.

Keep the originals. If the airline never sends a letter, what can you use instead? Build a dated record from several sources.

What documents can prove a flight delay?

One document rarely proves everything. Turns out, the strongest file usually combines the airline's records with documents you saved yourself.

A boarding pass alone is thin evidence. Pair it with a dated airline alert.

Save the original email or PDF, and keep the full timestamp visible. Don't edit a screenshot, crop away the date, or depend on a social media post that could disappear.

Ask for a useful airline delay confirmation

Ask for facts that identify the flight and let a reviewer measure the delay. A note that says only "operational delay" may not do either job. Give the airline enough detail to match the record to you.

Request both departure and arrival times. Final arrival is especially useful for an EU261 review.

Airlines use different labels for the same kind of record. You might see delay certificate, flight disruption letter, travel verification letter, or proof of delay. Sometimes the carrier's response is one line and not very helpful, but it still gives you a starting point.

How to request proof from the airline

Use the airline's app, website, customer-relations form, or email address. Start in writing.

1. Download the itinerary, boarding pass, app alerts, and airport notices you already have.
2. Give the airline the flight number, date, route, passenger name, and booking reference.
3. Request the scheduled and actual departure and arrival times. Ask for the recorded reason if the airline can provide it.
4. Store the reply in its original form. Keep the email, PDF, case number, and response date.
5. If there is no answer, send a short follow-up and check the deadline that applies to your claim. Then use the escalation route for that claim.

You can send this:

Please provide written confirmation of the disruption to flight [number] on [date], traveling from [airport] to [airport]. Please include the scheduled and actual departure and arrival times, the final arrival time if this was a connecting itinerary, and the recorded reason for the delay or cancellation if available. My passenger name is [name] and my booking reference is [reference].

A gate agent may explain the problem verbally. Note the agent's name and the time, then ask for the same information in writing.

U.S. flight delays: what proof can and cannot establish

U.S. rules do not create automatic cash compensation just because a flight was delayed. Evidence and entitlement are separate questions.

The U.S. Department of Transportation's flight-delay guidance helps separate federal protections from an airline's voluntary policy. Thing is, a delay certificate proves an event. It does not prove that the airline owes you money.

For an ordinary delay, a meal voucher, hotel room, travel credit, or cash offer may come from the airline's policy, your ticket terms, travel insurance, or a card benefit. Check the document that controls your request.

Refunds follow a different path. Under the DOT refund guidance, a refund may be available when an airline cancels a flight or makes a significant change and you do not accept the alternative transportation. Keep the original itinerary, the airline's change notice, any replacement offer, and your payment record.

Tarmac delays have separate requirements. If your aircraft remains on the tarmac, record the times and announcements, along with any problems involving food, water, or restroom access. The DOT flight-delay page addresses that situation separately.

EU261 claims: which evidence matters?

EU261 uses a different test. On a covered route, a passenger who reaches the final destination at least three hours late may qualify for fixed compensation, unless an exception such as extraordinary circumstances applies. The official EU passenger-rights guidance sets out the coverage, exceptions, and amounts.

The usual compensation bands are EUR 250, EUR 400, or EUR 600, based mainly on flight distance. Rerouting can affect the amount in some cases.

Measure the delay at the final destination, not just at the gate. Keep the booking, boarding pass or check-in record, airline messages, rerouting details, and any carrier record showing the actual times.

The right to care is separate from fixed compensation. Depending on the circumstances, the airline may have to provide meals, communication, or overnight accommodation. Keep itemized receipts if you had to pay for necessary expenses yourself.

A departure delay of five hours or more may give you a separate choice between continuing the trip and seeking reimbursement. Read the EU passenger-rights summary of Regulation 261/2004 before treating that option as a compensation claim.

Coverage depends on the route and the operating carrier. Buying a flight in the United States does not automatically bring it under EU261.

Insurance and credit card claims use their own rules

An insurer or card-benefit administrator applies its own policy or benefit guide. DOT and EU261 do not automatically decide that claim.

The requested packet may include your itinerary, boarding pass, airline delay confirmation, proof of the actual delay, receipts, proof of payment, and correspondence with the carrier. It may also set a waiting period, covered expenses, exclusions, and filing deadline.

Ask for the required document list before you file. An airline letter that works for one request may not satisfy an insurer.

An insurance payment is not the same as an airline refund. They are separate claims against different parties.

Can FlightAware or another tracker prove a delay?

A public flight tracker can fill a gap when the airline does not issue a certificate. Save a page or screenshot showing the flight number, date, scheduled times, actual times, and the time you captured the information.

To be honest, a tracker works best as corroboration. It may use estimated, rounded, or different operational times, so it is not automatically an airline-certified record.

Use the airline's record first when one is available. Then add the tracker, booking, boarding pass, airline messages, and airport evidence.

Airport boards can help too. Keep the original image and note the terminal, gate, local time, and flight number.

What to do when the airline will not issue a letter

Not receiving a certificate does not automatically end a claim. Write a short timeline in local time and label the source for each entry.

Booking confirmation: scheduled route and time.
Boarding pass: connection to the affected flight.
Airline alert: the carrier acknowledged a disruption.
Tracker or airport record: reported actual timing.
Receipts: money spent because of the disruption.

Ask the airline to confirm only the missing fact. A focused request for the actual arrival time is easier to review than a long account of the entire trip.

If the airline rejects a U.S. request or fails to address a refund issue, compare its written response with the DOT consumer guidance. For an EU261 dispute, use the national enforcement route identified in the official EU guidance. A complaint creates a record, but it does not guarantee payment.

Common questions about delayed-flight proof

Is a boarding pass enough?

Usually not. It links you to the flight, but normally does not establish the actual delay. Add an airline notice, airport record, tracker history, or delay letter.

Can a screenshot count as proof?

It can support a claim. The screenshot should show the flight number, date, message, and timestamp. Keep the original file and don't edit it.

Should I request proof of departure or arrival?

Ask for both. Departure timing supports a general disruption claim. Final arrival timing matters especially for many EU261 compensation claims.

Does a delayed-flight letter guarantee compensation?

No. It proves an event.

Eligibility still depends on the rule, route, cause, delay length, ticket status, policy terms, and whether you accepted alternative transportation.

How long should I keep the evidence?

Keep it until the airline, insurer, card administrator, or regulator closes the matter. Save the final decision and payment record too.

Download your itinerary and boarding pass now. Then request a written record with the scheduled and actual times, especially your final arrival time.