Before Brexit, EU Regulation 261/2004 applied to the United Kingdom in the same way it applied to all EU member states. When the UK left the EU on 31 December 2020, EU regulations stopped having direct effect in UK law. The UK government anticipated this and adopted EU261 into UK domestic law before the transition ended, through The Air Passenger Rights and Air Travel Organisers' Licensing (Amendment) (EU Exit) Regulations 2019.

The result is that the UK now has its own near-identical regulation, sometimes called UK261. The substantive rules are essentially the same as the original EU regulation. The compensation amounts, the eligibility criteria, the extraordinary-circumstances defence, and the rights to refund, rerouting, and care are all the same in substance.

What changed is the legal architecture. UK261 is now domestic UK law, interpreted by UK courts. EU261 remains EU law, interpreted by the Court of Justice of the European Union. The two regulations could theoretically diverge over time as courts in each jurisdiction interpret the same text differently, or as one side amends.

For most practical purposes — the categories of claim, the amounts, the process — the two regulations remain interchangeable. The differences matter at the edges: which jurisdiction's courts hear the case, which currency the compensation is paid in, and how cross-border issues are resolved.

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The applicable regime depends on the flight route and the operating carrier.

In practice, for the overlap case — UK ⇄ EU/EEA — passengers can typically choose which jurisdiction to claim in, with UK courts and the UK CAA generally easier for UK-based passengers and EU national bodies generally easier for EU-based passengers. For flights between the UK and non-EU destinations, only UK261 applies.

Same structure, different currency — and the values have drifted

The structure is identical — three bands by flight distance — but the currency differs.

The pound amounts were set when the UK regulation was adopted at conversion rates broadly comparable to the euro amounts at the time. They have not been updated since, and the relative value has drifted as exchange rates have moved. The compensation in UK261 cases is payable in pounds; in EU261 cases it is payable in euros.

Where both regimes could apply (UK-EU routes), the passenger generally has a choice of jurisdiction and therefore of currency. Some passengers strategically file in whichever currency is currently more favourable, though for individual claims the difference is usually modest. The full band-by-band breakdown, including flight-distance edge cases, sits in the EU261 compensation amounts guide.

Same first step, different escalation routes

The first step is the same: file a written claim with the operating airline. The airline's obligations to respond, provide care, offer rerouting or refund, and pay compensation are all the same in substance.

The escalation routes differ. For UK261 claims, the escalation goes to the UK Civil Aviation Authority, then to UK county courts or the ADR schemes operated under CAA approval (CEDR, AviationADR). For EU261 claims, the escalation goes to the National Enforcement Body of the relevant EU country, then to that country's civil courts or to the European Small Claims Procedure for cross-border cases.

UK ADR is generally faster than national EU enforcement bodies and produces binding decisions if both parties accept. EU NEB processes are typically free but produce non-binding opinions, requiring court action if the airline refuses to comply.

For UK-based passengers, filing UK261 claims is procedurally easier — UK courts, UK regulators, English-language correspondence by default, no cross-border complications. For EU-based passengers, EU261 is similarly easier. For passengers caught in the middle (a UK resident on an EU departure, for example), the choice between regimes is a strategic decision that can affect speed and outcome.

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Airline first, then three escalation routes

The first stop is the airline directly, exactly as under EU261. The claim should be filed in writing, with documentation, citing the relevant regulation (referenced as "The Air Passenger Rights and Air Travel Organisers' Licensing (Amendment) (EU Exit) Regulations 2019" or simply "the UK's retained version of Regulation 261/2004").

If the airline rejects the claim, the escalation routes include:

• UK Civil Aviation Authority (CAA). The CAA is the UK's designated enforcement body and can investigate non-compliance. It does not issue binding orders to pay individual claims but can apply pressure on airlines and refer matters for enforcement action.
• Approved Alternative Dispute Resolution (ADR). Several airlines have signed up to ADR schemes accredited by the CAA — primarily CEDR and AviationADR. These schemes produce binding decisions if both parties accept the jurisdiction. The process is free for passengers; airlines pay the operating costs.
• UK county courts. The Small Claims Track of the County Court handles civil claims up to £10,000 in England and Wales, with comparable thresholds in Scotland and Northern Ireland. Filing fees are based on the claim value; for typical EU261 amounts the fee is £25–£70.

The ADR route is generally the most efficient for UK261 claims. CEDR and AviationADR typically resolve cases in 4–8 weeks, considerably faster than court. Where the airline has not signed up to an ADR scheme, the CAA route or direct court action are the remaining options.

The overlap case — where you actually get to choose

Flights between the UK and the EU/EEA are covered by both regimes — UK261 because the flight involves the UK, EU261 because the flight involves the EU. In practice, this means the passenger generally has a choice of jurisdiction.

The practical considerations:

For UK-based passengers, filing under UK261 is usually easier. UK courts, UK regulators, English-language process by default, no need to interact with national EU enforcement bodies. The CAA ADR route is particularly efficient.

For EU-based passengers, filing under EU261 in their home country is usually easier. National enforcement body, national language, national courts if needed, no cross-border complications.

For passengers from outside both jurisdictions (US, Australian, etc.), either route works. The choice often comes down to whether they have a stronger connection to UK or EU systems, or which airline is involved — UK-based airlines tend to settle UK261 claims faster.

Claims-management companies select the optimal jurisdiction case-by-case. AirHelp, for example, will assess the airline, the route, and the case characteristics and file in whichever regime gives the strongest position. This is one of the practical advantages of using a claims service over DIY filing — the strategic choice between regimes is handled automatically. If you want to see how the major services stack up on fees and success rates, our AirHelp vs ClaimCompass vs Skycop vs Flightright comparison ranks them.

Not in substance — but the interpretation is now independent

Not in substance, as of the time of writing. The UK retained EU261 essentially as-is when it adopted the regulation into UK law, and has not since made significant amendments. The UK government has signalled interest in reviewing aviation passenger rights but has not enacted substantive changes.

What has happened is that UK courts now interpret the regulation independently of the Court of Justice of the European Union. UK judges are free to depart from CJEU rulings issued after Brexit, though they generally treat CJEU jurisprudence as persuasive. So far, UK court rulings on UK261 have aligned closely with EU261 jurisprudence, but divergence is theoretically possible.

The UK regulatory landscape also includes the Aviation Consumer Policy Reform consultation, which in recent years has discussed possible changes including: introduction of compensation for short delays; changes to the extraordinary-circumstances regime; expansion of mandatory ADR coverage; alignment or divergence with EU revisions.

For now, the practical guidance is that UK261 and EU261 are substantively identical. Future divergence is possible but has not occurred. Passengers should track UK CAA announcements for any forthcoming changes.

The CAA — with sharper teeth than most EU enforcement bodies

The UK Civil Aviation Authority (CAA) is the designated enforcement body for UK261. The CAA's role includes monitoring airline compliance, investigating systematic non-compliance, and overseeing the ADR scheme through which most individual disputes are resolved.

The CAA has stronger enforcement teeth than most EU NEBs. It can investigate UK-licensed airlines directly, apply pressure through licensing conditions, and refer matters for prosecution where airlines persistently fail to comply with the regulation. Some EU NEBs have similar powers; many do not. This difference can matter when an airline is being particularly recalcitrant.

The CAA does not, however, issue binding orders to pay individual claims. That requires either ADR (where the airline has signed up to a scheme) or court action. The CAA can refer cases to ADR providers and can intervene on a passenger's behalf in some situations, but the final compulsion to pay comes from the ADR decision or the court order.

The UK CAA also publishes annual reports on airline performance and consumer complaints, which provide useful context for choosing carriers. The data tends to highlight which airlines settle claims quickly and which routinely require escalation.

Old claims run on the rules in force when you flew

For flights that occurred before 31 December 2020, claims are governed by the EU regulation as it applied at the time of the flight. Brexit did not retroactively invalidate pre-existing claims — passengers can still pursue old claims under the rules that applied when the flight took place.

The procedural picture is more nuanced. UK courts and UK regulators continue to handle these claims, applying the version of the regulation that was in force on the date of the disrupted flight. CJEU rulings made before Brexit are binding precedent for UK courts handling pre-Brexit claims; CJEU rulings made after Brexit are persuasive but not binding.

For passengers with pre-2021 claims still in process, the practical implication is generally minor. The substantive law is the same, the courts are the same, the airlines are the same. The change of regulatory framework happens at the political and structural level rather than at the individual-claim level.

Time limits still apply — a UK passenger pursuing a pre-Brexit claim must still respect the 6-year UK statute of limitations from the date of the flight. A flight from 2019 can still be claimed (as of 2026) but the deadline approaches. The claim deadlines guide covers the limitation periods by country.

Probably, slowly — and one EU revision is already drafted

Probably, slowly. The two regulations are now independent legal instruments interpreted by separate court systems. Even without active amendment, the two will likely drift apart as courts in each jurisdiction interpret the same text in slightly different ways or face slightly different fact patterns.

Active divergence is also possible. The European Commission has proposed a substantial revision of EU261, with draft changes endorsed by the EU Council in 2025. If those changes are adopted, EU261 will move while UK261 stays at its current position (unless the UK chooses to mirror the changes).

The proposed EU revisions include changes to: compensation thresholds (potentially raising the delay threshold from 3 to 5 hours), compensation amounts, the extraordinary-circumstances definition, and care obligations. None of these have been adopted yet, and the political process is uncertain. The UK has indicated it will assess any EU changes against its own interests before mirroring or diverging.

For passengers in 2026, the practical guidance is to treat the two regimes as functionally equivalent for now. Future divergence is something to monitor — particularly for UK-EU routes where the choice of regime could become more consequential.