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Liquid Limits

Why liquid rules can be different on your return flight

It's a common scenario: outbound from a 2-litre airport, return from a 100ml airport, and security on the way home keeps your duty-free olive oil. Here's why it happens and how to avoid it.

Last updated · Reviewed against current airport security guidance

Short answer

It's a common scenario: outbound from a 2-litre airport, return from a 100ml airport, and security on the way home keeps your duty-free olive oil. Here's why it happens and how to avoid it.

General guidance

Rule basis: General airport security guidance — rules can vary between airports and change over time. Confirm with your departure airport before you fly.

What to do: Pack to 100ml per container in a single 1-litre clear bag unless you've confirmed a larger allowance at both your departure airports.

Liquid Limits is a travel planning tool, not an official aviation source. Always confirm with the airport before you travel.

At a glance

Security

Will this pass the checkpoint?

Check rules

Rules vary by airport — some still enforce 100ml, others now allow 2L containers in CT scanners.

Source: Airport operator pages
Airline

Can this travel in cabin or checked baggage?

Cabin OK

Most airlines defer to airport security on liquids in the cabin.

Border

Can you bring this into the destination country?

Usually OK

Liquids themselves are rarely a customs issue — but contents (alcohol, dairy, CBD) might be.

Three separate rule systems · Any one can stop your item

The airport, not the airline, sets the rule

Airlines do not write security rules. Each airport applies the rule set by its national aviation security authority. That rule depends on which scanners the airport currently runs, and how the regulator has chosen to use them.

Same trip, two different rules

Flying London Gatwick → Athens then Athens → London Gatwick? You'll face the 2L rule on the way out and the 100ml rule on the way back. Many travellers assume the rule "follows" their booking — it doesn't.

Pack to the stricter rule

The simplest mental model: look up the rule at both airports, pick the stricter one, and pack to that for your whole trip. If your return airport is unknown, default to 100ml — that's the global baseline.

Check your trip

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