Eight UK airports allow 2-liter liquids, but a CT scanner doesn’t change the rule

Eight UK airports allow liquid containers up to 2 liters in cabin baggage in 2026: Heathrow, Gatwick, Edinburgh, Birmingham, Bristol, Belfast International, Belfast City and Bournemouth. In Europe, Dublin, Vilnius and Milan Linate have lifted the 100ml cap, while Munich and Frankfurt allow 2 liters only at CT-equipped lanes.

Everywhere else, the 100ml container limit and the 1-liter clear bag still apply — and a CT scanner in the security hall does not mean the rule has changed.

The eight UK airports where 2 liters is genuinely allowed

Heathrow, Gatwick, Edinburgh, Birmingham, Bristol, Belfast International, Belfast City and Bournemouth are the confirmed set. At each, containers up to 2 liters are permitted in cabin baggage, and liquids and electronics can stay inside the bag through screening — no tray, no fiddling with a plastic pouch.

Heathrow is the only airport in that group whose own published guidance could be checked directly, and it permits containers up to 2 liters through security, according to Aylesbury Airport Transfers‘ 2026 roundup of UK liquid rules. Read further into Heathrow’s own material, though, and the picture splits by terminal.

The airport’s general hand-baggage page lists the 2-liter allowance across Terminals 2, 3, 4 and 5.

The assistance departure guide is narrower: Terminals 2, 3 and 5 run the relaxed process, while Terminal 4 is still working through its security upgrade and can hold departures to a 100ml container limit and a 1-liter clear bag in the meantime.

Your ticket does not enter into it. What decides the rule is the security hall attached to the terminal you actually depart from.

Read the table honestly and it does two jobs. It confirms Heathrow’s terminal-level split, and it refuses to dress up secondary claims about the other fourteen airports as verified status. No effective dates for Gatwick, Edinburgh, Birmingham, Bristol, Belfast International, Belfast City or Bournemouth came back from official airport material — so they are left blank rather than guessed.

Which airports have scrapped the 100ml rule in Europe

Europe’s answer is more fragmented than the UK’s.

Dublin, Vilnius and Milan Linate allow the 2-liter limit. At Dublin the change is fully in force — liquids and electronics stay inside cabin bags through screening, no removal required, which makes it the cleanest European “yes” on the board.

Then there is the category most coverage skips entirely: airports that are simultaneously yes and no. At Munich and Frankfurt, only the security lanes fitted with new CT scanners accept 2-liter containers. The remaining lanes at both airports still cap liquids at 100ml.

That is not a temporary glitch or a training gap. It is two rulebooks running side by side in the same building, and which one applies to you depends on which lane an agent waves you toward. A traveler who reads “Frankfurt allows 2 liters” and packs accordingly has a coin-flip’s worth of protection.

Beyond those five airports, the EU rollout stays uneven, with other airports still enforcing the old container cap. Treat the European picture as a set of individual airport decisions rather than a bloc-wide change.

The airports with CT scanners that still enforce 100ml

London City, Manchester, Stansted and Luton form the clearest proof case for the distinction this article exists to make. Each has CT scanners in place. At each, the 100ml container limit still applies to every passenger.

The equipment is not the bottleneck. A CT scanner images liquids in three dimensions and can, in principle, clear a 2-liter bottle without anyone opening a bag. What it cannot do is change the rule by itself — that requires a separate regulatory decision, and until it lands, the airport remains bound to the old cap no matter how modern the hall looks.

This is why “CT scanner airports” and “airports that have scrapped 100ml” are two different lists, and why the first one is longer. If you see the machine and assume the rule followed it, you are the passenger the tray was built for.

Why approval lags the hardware

Two separate sign-offs sit between a scanner and a relaxed rule. The first covers the machine: the Department for Transport publishes approval lists for cabin-baggage screening equipment and for liquid-explosive detection systems inside the government’s aviation-security guidance, so the hardware is formally signed off before it screens anyone.

The second is the airport’s permission to stop enforcing the old cap — and here the public record thins out. No published document states that installing approved equipment by itself entitles an airport to raise the passenger limit, and no airport-by-airport approval formula appears anywhere in the material. The popular claim that sign-off gates each individual 2-liter change therefore holds up only in part.

The practical consequence is that “approved equipment” and “approved rule change” are two different documents. An airport can hold the first and not the second — which is precisely what you are looking at when a modern lane still hands you a tray. For a longer look at why the cap survives even where the scanners are already in place, that piece picks up the regulatory thread.

The strictest-leg rule: why your connection can still empty your bag

Here is the part that catches experienced travelers. The liquid rule that applies to you is set by the departure airport’s current security policy — and a multi-leg itinerary can put several of those in front of you.

Heathrow’s own connecting-flight guidance sets out the re-screening mechanism. A passenger making a connection is screened again at the airport where they change planes, and the rules in force at that checkpoint are the ones that decide what survives the trip. Leave Heathrow with a full-size bottle under the 2-liter allowance, connect through an airport still on 100ml, and the bottle is gone.

No named confiscation case — a passenger, a flight, a date, an outcome — turned up in the material behind this article, so the warning rests on the documented re-screening step rather than a specific horror story. The step is enough.

Two more limits worth stating plainly. Cathay Pacific‘s controlled-items guidance caps each cabin liquid item at 100ml and routes anything larger to checked baggage — but that is a carrier rule, not evidence about any airport’s checkpoint. And no Asia-Pacific or US airport status could be verified in this pass, so neither region appears in the confirmed list above.

What this means for you

Pack to the strictest leg, not the first one.

If your itinerary touches any airport that hasn’t lifted the cap, assume the 100ml container limit and the 1-liter clear bag apply for the whole trip — a decant kit costs less than a confiscated bottle of anything worth carrying.

Check the terminal, not just the airport. Heathrow is the live example: the general page and the assistance guide disagree about Terminal 4, and only one of them describes the hall you’ll actually stand in.

And re-verify close to departure. There is no centralized, real-time official database for this, which is precisely why individual airport pages are the only reliable source — and why a page like this one is a starting point rather than a final answer.

Key terms

CT scanner

An airport CT scanner is a cabin-baggage X-ray machine that builds a three-dimensional image of a bag’s contents instead of a flat two-dimensional shadow. Because it reads the density of what it is looking at, it can in principle clear a liquid without anyone opening the bag. That is why it is so easy to mistake the arrival of a CT lane for the lifting of a rule: the machine changes what security can see, not what the airport is allowed to permit.

Department for Transport

The Department for Transport is the UK government department that approves the security equipment used at airport checkpoints, including cabin-baggage screening machines and liquid-explosive detection systems. Its approval lists sit inside the government’s published aviation-security guidance, which makes equipment sign-off a matter of public record. What that record does not settle is whether approval of a machine also licenses an airport to raise its passenger liquid limit — the link this article found documented only in part.

100ml container limit

The 100ml container limit is the rule that caps each individual liquid item in a cabin bag at 100ml, carried in a single transparent 1-liter bag. It was the standard across the UK and the EU for years before CT screening arrived, and it stays in force until a regulator lifts it for a given airport. That is why this article’s confirmed list is measured in single airports rather than whole countries: lifting the cap is a decision taken one departure point at a time.

Re-screening

Re-screening is a second security check performed on connecting passengers at the airport where they change planes. It happens because each airport runs its own checkpoint rules, and the airport where you change planes applies its own. Heathrow’s connecting guidance documents the step, which is why a passenger can comply fully at the start of a trip and still lose a container partway through it.

Questions? Answers.