Winning a claim under Regulation (EC) 261/2004 is rarely about whether you deserve compensation. It is about whether you can prove, with documents, that your flight was covered by the regulation, that it arrived or departed outside the qualifying thresholds, and that the airline's stated reason for the disruption does not fall within the extraordinary circumstances defence. Airlines reject the majority of first-pass claims not because the claims are invalid, but because the evidence submitted is thin, ambiguous, or easy to dispute. This guide sets out exactly what evidence matters in 2026, what airlines look for, and where claimants most often go wrong.
The Direct Answer: What Evidence Wins EU261 Claims
Also worth reading: How Does an EU 261 Delay Compensation Calculator Actually Determine Your Payout? · Can You Claim EU 261 Compensation After a Security-Related Flight Delay in 2026? · What Are the EU Flight Compensation Rules for Delays, Cancellations, and Denied Boarding in 2026?
The core evidence set for any EU261 claim is remarkably short, and most of it is already in your possession. You need proof of the booking (a booking confirmation or e-ticket showing the flight number, date, and passenger name), proof of the disruption (the boarding pass, the airline's delay or cancellation notification, or airport departure board records), and proof of the actual arrival or departure time (the timestamp recorded on landing or at the gate). Under EU261, compensation of €250, €400, or €600 is triggered when a flight arrives at its final destination at least three hours late, is cancelled with fewer than 14 days' notice, or is cancelled without rebooking. The distance thresholds matter: €250 for flights up to 1,500 km, €400 for intra-EU flights over 1,500 km and other flights between 1,500 and 3,500 km, and €600 for flights over 3,500 km with a delay exceeding four hours.
What separates a winning claim from a rejected one is usually the quality of the disruption evidence. A screenshot of an airport departure board, a photo of the gate display showing the delay, or a written statement from airline staff carries far more weight than a vague recollection. Recent cases reported in the UK press illustrate the point: a couple who won compensation from Ryanair after an initial knock-back did so by persisting with documented evidence rather than accepting the airline's first refusal. Airlines count on claimants giving up after one rejection. Evidence is what turns a refusal into a payout.
Why Evidence Matters More Than the Merits of Your Claim
EU261 places the burden of proof for extraordinary circumstances squarely on the airline, not the passenger. If a carrier claims your delay was caused by weather, an air traffic control strike, or a bird strike, the airline must produce evidence supporting that defence. In theory, this should make claims straightforward. In practice, airlines issue blanket refusal letters citing 'extraordinary circumstances' without any supporting documentation, and they rely on passengers either accepting the refusal or lacking the records to challenge it.
Academic research published in Wiley Online Library on mandated flight delay compensation has documented how airlines respond strategically to compensation rules, including gaming behaviour around how delays are recorded and classified. This is why independent evidence — departure board photos, flight tracking data from services that log historical arrival times, and contemporaneous notes — matters so much. If the airline's internal records say one thing and your independent evidence says another, a court or an alternative dispute resolution body will weigh the independent evidence more heavily. The lesson from a decade of EU261 litigation is that the airline's word is not evidence; it is a claim that must be tested.
The Essential Document Checklist
Before submitting any claim, assemble the following. Each item either establishes eligibility or defeats a specific airline defence.
Booking and identity evidence establishes that you were a passenger on a covered flight. This includes the booking reference or e-ticket, the passenger name as it appears on the reservation, and the flight number and date. If you booked through a third party or travel agent, keep the original confirmation, because airlines sometimes dispute direct bookings only.
Disruption evidence establishes that the qualifying threshold was met. The single most useful item is your boarding pass, which proves you actually checked in and boarded (or attempted to board). Pair it with a photograph of the departure board showing the delayed status, or a flight tracking screenshot showing the actual arrival time. If the flight was cancelled, keep the cancellation email or SMS, noting the exact date and time it was sent — this determines whether the 14-day notice rule was breached.
Financial evidence supports any additional expenses claim beyond the fixed compensation. Under EU261 Article 9, airlines must cover meals, refreshments, hotel accommodation, and transfers during long delays, and you can recover reasonable consequential costs such as a replacement ticket with another airline. Receipts are non-negotiable here; card statements alone are weaker than itemised receipts.
Comparing Your Evidence Options: DIY vs Assisted Claims
How you gather and present evidence affects both your success rate and your payout. The table below compares the two main routes.
| Feature | DIY Claim (Direct to Airline) | Assisted Claim (Service like AI Flight Refunds) |
|---|---|---|
| Cost | Free, but your time | Typically 25–35% commission, only on success |
| Evidence gathering | You source everything yourself | Service pulls flight status and tracking data automatically |
| Airline refusal handling | You must escalate to national enforcement body or court | Service handles escalation and legal letters |
| Success rate | Lower on first submission; airlines reject easily | Higher; refusals are contested with precedent and data |
| Speed | 2 weeks to several months if uncontested | Often 4–12 weeks, longer if court action is needed |
| Best for | Simple, undisputed delays with full paperwork | Refused claims, disputed extraordinary circumstances, or missing records |
Proving Extraordinary Circumstances Did Not Apply
The extraordinary circumstances defence is where most EU261 disputes are won or lost. Airlines routinely cite air traffic control restrictions, severe weather, security risks, and crew issues. Some of these are genuinely extraordinary; many are not. Technical faults discovered during routine maintenance, crew scheduling failures, and knock-on delays from earlier problems on the same aircraft are generally not extraordinary, because they fall within the airline's normal operational control.
Your evidence strategy here is to test the airline's specific claim. If the airline says weather, check whether other flights on the same route and time operated normally — a flight tracking screenshot showing sister flights departing on time is powerful counter-evidence. If the airline cites an ATC strike, verify the strike affected your specific airspace and window; the Italy air transport strike of 13 June, for example, was widely reported with defined hours, so a delay outside those hours cannot be attributed to it. If the airline cites crew issues, note that a June 2026 incident in which a United flight was diverted after a passenger bit crew members made headlines precisely because such events are rare — airlines citing 'crew problems' for routine disruptions face scepticism from adjudicators who see the defence used weekly.
Common Mistakes That Sink Otherwise Valid Claims
The most frequent error is discarding boarding passes. Passengers assume the airline's records suffice, but airlines have been known to dispute whether a passenger actually checked in, particularly on overbooked or rebooked flights. Keep physical or digital boarding passes until the claim is paid.
The second mistake is accepting the first refusal. Airlines issue template rejection letters citing extraordinary circumstances as standard practice. A refusal is an opening position, not a final answer. Escalate to the national enforcement body of the country where the departure airport sits, or pursue the claim through a claims service or small claims court. The Edinburgh couple who eventually won against Ryanair did so only after the airline initially knocked the claim back.
The third mistake is claiming the wrong amount. Passengers frequently under-claim by applying the €250 rate to long-haul flights, or over-claim by ignoring the distance bands. A 2,000 km intra-EU flight delayed three hours pays €400, not €250. Getting the band wrong invites the airline to dismiss the claim as careless.
The fourth mistake is missing the time limit. Limitation periods vary by member state — from one year in some jurisdictions to six years in others, with the UK generally allowing six years for EU261 claims brought in England and Wales. Delay costs you nothing in most jurisdictions, but waiting beyond the limit forfeits the claim entirely.
When to Act and What It Costs
Act while evidence is fresh and retrievable. Flight tracking services retain historical data, but some only allow free lookups for a limited window, and airport records are not indefinitely accessible. Submit your claim within weeks of the disruption, not months. If the airline does not respond within the two months that several enforcement bodies treat as a reasonable response window, escalate immediately.
On cost: a direct claim is free. Assisted services, including AI Flight Refunds, operate on a no-win, no-fee basis, typically deducting 25–35% of the recovered amount, with some adding a VAT component or a higher rate if court action becomes necessary. Legal action through small claims courts in the UK costs from £35 to a few hundred pounds in fees depending on the claim value, recoverable from the airline if you win. Weigh the commission against the realistic probability of success: a contested €600 claim pursued alone might take a year and multiple escalations, whereas a service takes a cut but handles the contest. For claims under €250, the economics of assisted services are less attractive and a DIY approach often makes more sense.
The 2026 Context: Why Documentation Standards Are Rising
The regulatory environment around EU261 is under active revision, with the European Parliament and industry bodies such as IATA publicly clashing over proposed changes to delay thresholds and compensation levels. Whatever the final revised rules look like, one trend is already clear: airlines are becoming more systematic in contesting claims, and adjudicators are expecting more rigorous documentation from passengers. Meanwhile, operational chaos at major hubs — such as the Atlanta Delta crisis in June 2026, which saw 26 cancellations and 113 delays in a single day — generates exactly the kind of mass disruption events where individual passengers with strong documentation fare far better than those relying on airline goodwill or blanket vouchers.
The practical takeaway is unchanged by any of this: EU261 compensation is a paperwork exercise as much as a legal right. Passengers who photograph the departure board, keep the boarding pass, log the actual arrival time, and retain receipts recover compensation at high rates. Passengers who rely on memory and the airline's own records recover far less often. Build the evidence file on the day of travel, and the claim largely argues itself.