Do I Need a UK ETA for a Layover?
The answer depends on one question: does your layover keep you in the international departure zone (airside), or do you cross UK immigration (landside)? Airside transit through a UK airport doesn't require a UK ETA for most nationalities. The moment you enter the UK — even briefly — you do.
Airside transit — no ETA needed (for most)
If your bags are checked through to your final destination, you're staying in the same airline alliance, and you're not leaving the international terminal, you're airside. You'll walk from one gate to another without passing through UK border control. No ETA required.
When you do need a UK ETA for a layover
You need a UK ETA any time you cross UK immigration — regardless of how briefly. This happens when:
- Your bags aren't checked through and you need to collect and recheck them
- You're changing airlines and the new airline requires you to enter departures from the check-in hall
- You're taking a domestic UK connection (e.g. Heathrow → Manchester) — this counts as entering the UK
- You want to leave the airport to explore London during a long layover
- Your flight was missed or cancelled and the airline is routing you through the landside terminal
Heathrow specifics
Heathrow's five terminals are connected airside if you're on the same booking with through-checked bags. However, Terminal 4 and Terminal 5 have specific transfer routings — some connections between terminals 3 and 5 for certain airlines require clearing UK border control even with checked-through bags. If you're connecting between Terminal 4 and Terminal 3, check with your airline before travel.
The Direct Airside Transit Visa (DATV) — a different rule
The ETA is separate from the UK's airside transit visa requirement. A small number of nationalities need a Direct Airside Transit Visa (DATV) even for airside transit — meaning they need UK permission just to connect through a UK airport without entering the country. Most visa-exempt nationals (US, Canada, Australia, Japan, etc.) are exempt from DATV. Check the UK government's transit visa list at gov.uk if you're unsure whether your passport requires one.
When in doubt: £16 is cheap insurance
If your layover itinerary is complicated or unclear, just apply for the UK ETA. It's £16, valid 2 years, approved within minutes in most cases, and covers you for any scenario where you end up needing to enter the UK — including unexpected diversions, delays, or re-routings.
Find out what your family needs
Four quick questions. Personalised per family member. Tells you exactly what to apply for and when — UK ETA, ETIAS, EES, or nothing.
Take the quizCommon questions
Do I need a UK ETA for a Heathrow connection?
Not for airside transit with through-checked bags. If you need to collect baggage, change airlines, or enter the UK for any reason, yes — you need an ETA.
I have a 3-hour layover at Gatwick and my bags are checked through. Do I need an ETA?
No. Staying airside with through-checked bags doesn't require entering the UK — no ETA needed.
What's the difference between a UK ETA and a transit visa?
A UK ETA is for people entering the UK. A Direct Airside Transit Visa (DATV) is for people from certain nationalities who need permission to transit through a UK airport without entering. Most visa-exempt nationals need neither for airside transit.
My bag needs to be rechecked at Heathrow. Do I need a UK ETA?
Yes — rechecking bags means collecting them, which requires clearing UK immigration. Apply for an ETA before you travel.