There is no single worldwide deadline for a delayed-flight claim. The controlling date depends on the route, the operating airline, the legal scheme, and the country or court handling the claim. Your nationality and the website used to book the ticket usually don't set the deadline.

For a flight governed only by U.S. rules, an ordinary delay generally doesn't create a federal right to fixed cash compensation. An eligible EU261 or UK261 delay may qualify for fixed compensation, but neither framework creates one universal filing period. National limitation rules, separate notice requirements, and the correct complaint or court route can affect whether a claim remains available.

If the deadline may be close, submit the claim immediately and find out what formal step preserves the right to sue. An airline's customer-service response time doesn't automatically stop a legal limitation period.

Quick answer: flight delay claim deadlines by jurisdiction

Treat a deadline as an expiry date, not a target. A customer-service form may be a sensible first step, but some legal systems require court proceedings or another recognized action before the period expires.

First check whether the delay qualifies

A deadline matters only if the passenger has a valid compensation claim.

Under Regulation (EC) 261/2004 on EUR-Lex and the related Your Europe passenger-rights guidance, an EU261 delay claim will generally require:

• Arrival at the final destination at least three hours late.
• A covered flight, such as a flight departing from an EU airport or certain flights arriving in the EU from outside the EU on an EU airline.
• No valid extraordinary-circumstances defense, such as some weather or air-traffic-control events.

The relevant delay is measured at the final destination, not only when the aircraft leaves the departure airport. If connecting flights were booked under one reservation, the delay is generally assessed when the passenger reaches the final destination. Separately booked tickets are usually treated as separate journeys.

Standard EU compensation is based on distance:

An airline may reduce compensation by 50% in some rerouting situations. If the airline relies on an extraordinary circumstance, ask it to identify the specific event and the evidence supporting that position. A technical defect linked to ordinary maintenance isn't automatically an extraordinary circumstance.

The right to care is separate from fixed compensation. During a qualifying disruption, the airline may have to provide meals and refreshments in reasonable proportion to the wait, along with hotel accommodation and transport when an overnight stay is necessary. Keep receipts for reasonable expenses the airline didn't provide directly.

UK261 compensation is paid in pounds

UK261 is separate from EU261, although it uses a similar framework. It can cover flights departing the UK and certain flights arriving in the UK from outside the UK on a UK airline. The UK Civil Aviation Authority's delay guidance lists these standard amounts:

• Under 1,500 km: GBP 220.
• Between 1,500 and 3,500 km: GBP 350.
• Over 3,500 km: GBP 260 for an arrival delay of three to four hours, or GBP 520 for a delay of more than four hours.

The eligibility rules and exceptions still apply. Distance affects the compensation tier, not the time limit.

EU261 deadlines come from national law

EU261 sets the conditions for compensation but doesn't say that every passenger has two, three, or six years to bring a claim. The limitation or prescription rule applicable to the civil claim comes from national law. The relevant country can depend on the route, operating carrier, contract, and court jurisdiction.

Some national systems also require the passenger to notify the airline within a shorter period. That notice requirement can matter even when the ordinary court limitation period is longer. A deadline for a regulator or alternative-dispute-resolution body may be different again.

Secondary overviews such as Flymoney's limitation-period overview and SkyRefund's country examples illustrate how much these rules can vary. Treat those pages as orientation only, not as the legal authority for an expiry date. Verify the applicable statute, official consumer guidance, or local court procedure before relying on a country-specific period.

A national rule may also determine when the clock starts. It might run from the flight date, the date the claim arose, the end of a calendar year, or another legally defined event. Do not assume that adding a fixed number of years to the flight date gives the correct answer.

UK limitation periods depend on the forum

Six years is commonly cited for contract-based claims in England and Wales. That isn't a universal UK261 deadline. Scotland has a different limitation framework, and the appropriate forum can depend on the facts and legal basis of the claim.

A UK-based operating airline doesn't automatically give a passenger the longest possible period or the right to sue in any UK court. Confirm which court has jurisdiction and which law applies before relying on a date.

U.S. flight delays, refunds, and deadlines

The United States doesn't have an EU-style federal schedule requiring airlines to pay passengers a fixed amount for ordinary flight delays. An airline may voluntarily offer meals, hotel accommodation, rebooking, or travel credits under its customer-service policy, but those benefits aren't the same as statutory EU or UK compensation.

A refund is a separate issue. If an airline cancels a flight or makes a significant change and the passenger doesn't accept the alternative transportation, federal refund rights may apply. Taking the replacement flight can change the refund analysis. Keep the cancellation or schedule-change notice and use the airline's refund process promptly.

There is no single federal limitation period for every U.S. delay complaint. The possible deadline may come from:

• The airline's contract of carriage or customer-service commitment.
• A travel-insurance policy.
• State law if the passenger brings a contract or other court claim.
• A shorter notice period in a reimbursement or benefit policy.

AirHelp's U.S. passenger-rights overview provides general background on the difference between refunds and delay compensation. For a specific deadline, check the governing contract, insurance policy, or state-law procedure rather than relying on a general travel-rights page.

How to work out the deadline

Use the earliest reasonable expiry date until the applicable law is confirmed.

1. Separate the possible remedies. Decide whether you are seeking EU261 or UK261 compensation, a U.S. refund, expense reimbursement, an insurance benefit, or payment promised by the airline.
2. Identify the operating airline. The carrier that operated the flight may be responsible even if the ticket was sold by a travel agency or another airline.
3. Record the relevant dates. Save the scheduled and actual arrival dates at the final destination, along with the departure date and any rerouting details.
4. Check for a notice period. A requirement to contact the airline within a few months may be more urgent than the ordinary court limitation period.
5. Find out what preserves or pauses the claim. An online form, email, mediation request, or regulator complaint may not automatically suspend limitation. Don't assume that an airline acknowledgment pauses the clock unless the applicable law says it does.
6. Work to the earliest plausible date. If more than one law might apply, use the earlier date while you obtain jurisdiction-specific guidance.
7. Take the required formal step before expiry. Sending a claim is useful, but some systems require a court filing or another recognized legal action.

Save proof of every submission, including the date, claim number, attachments, and any acknowledgment from the airline.

What to send with a delay claim

Keep one folder containing:

• The booking confirmation and boarding passes.
• The flight number, date, route, and operating airline.
• Evidence of the actual arrival time at the final destination.
• Airline messages, airport delay notices, and rebooking details.
• Proof that connecting flights were on one reservation.
• Receipts for meals, transport, or hotel costs paid during the disruption.
• The airline's stated reason for the delay and any rejection message.
• A copy of the claim, attachments, and submission confirmation.

Write to the operating airline and identify the remedy you want. For example:

I am claiming compensation under EU261 or UK261 for flight [number] on [date]. I arrived at [final destination] at [time], which was [number] hours late. Please assess the claim and, if you deny it, identify the specific extraordinary circumstance and evidence relied on.

Ask for fixed compensation and expense reimbursement separately. A refund request for an unused ticket is also a different request under U.S. rules.

What to do if the airline rejects the claim

Ask the airline to state the legal reason for the refusal and preserve the response. Common explanations include:

• The arrival delay was below three hours at the final destination.
• The airline says an extraordinary circumstance caused the delay.
• The claim was sent to the wrong operating carrier.
• The itinerary involved separate tickets.
• The airline says the limitation or notification period expired.
• The evidence doesn't establish the arrival time or the passenger's booking.

Then use the route that matches the jurisdiction:

• EU: Find the relevant national enforcement body or consumer route through Your Europe. For a cross-border dispute, a European Consumer Centre may also help.
• UK: Check whether the airline belongs to an approved alternative-dispute-resolution scheme. Citizens Advice guidance explains the general complaint route.
• Germany: The Luftfahrt-Bundesamt complaint procedure says passengers should contact the operating airline first. It also explains that an authority may pursue administrative enforcement but can't necessarily recover an individual's civil-law payment.
• U.S.: Contact the airline's customer-relations department, then consider a complaint to the U.S. Department of Transportation if the issue concerns federal passenger rules. Use the insurer's own claims process for covered expenses.

A regulator or mediator may not pause the court limitation period. If the date is close, don't wait for an agency response before checking whether formal legal action is required.

If the deadline may have passed

A late claim isn't automatically hopeless, but the airline may rely on an expired limitation or prescription period. Check these points promptly:

1. Recalculate the date using the correct country, legal basis, start date, and calendar rule.
2. Check whether you submitted a legally recognized notice or started proceedings in time.
3. Look for a written acknowledgment, settlement discussion, or other event that may affect limitation under local law.
4. Check whether the airline's terms contain a separate contractual notice period.
5. Seek local consumer or legal guidance if the amount justifies it.

An airline agreeing to review a late claim doesn't necessarily waive a limitation defense. Likewise, a regulator's decision about the airline's conduct may not restore a private claim that has already expired.

Don't treat Huzar v Jet2 as a deadline extension. That case concerned whether a technical problem was an extraordinary circumstance; it didn't create a general exception to limitation periods. COVID-era extensions should also not be assumed to apply without checking the specific jurisdiction and claim.

If the airline has entered bankruptcy or insolvency, follow the administrator's instructions and note any separate proof-of-debt deadline. That deadline can be earlier than the underlying passenger claim deadline.

Common questions

Does flight distance change the deadline?

Usually not. Distance determines the potential EU or UK compensation tier. National law supplies the limitation period, and a separate notification requirement may apply regardless of whether the flight was short-haul or long-haul.

Does a three-hour departure delay qualify?

Not necessarily. EU and UK compensation generally depends on the arrival delay at the final destination. A passenger may make up time during the flight or after rerouting.

Can a U.S. passenger claim EUR 600?

Only if the route is covered by EU261 and the other eligibility conditions are met. A U.S. passport doesn't create EU261 rights, and a domestic U.S. delay doesn't become an EU claim because the passenger lives in the United States.

Does filing the airline's online form stop the deadline?

Not automatically. Keep proof of submission, but confirm whether local law requires court proceedings or another formal step to preserve the claim.

What should I do today if the deadline may be near?

Gather the itinerary and final-arrival evidence, identify the operating airline, calculate the earliest plausible expiry date, and submit a written claim immediately. If the airline has rejected the claim or the date may already have passed, verify the applicable law and formal procedure before relying on a generic country table.