UK ETA Transit Documents 2026 — What You Need at Heathrow & Gatwick

If you are connecting through Heathrow, Gatwick, or any other UK airport, you may need a UK ETA for your transit — but only if you plan to pass through UK border control. Passengers who remain airside (in the international transit area, without entering the UK) do not currently need a UK ETA for a connecting flight at Heathrow or Manchester (a temporary exemption). However, if you need to re-check luggage or have any reason to clear UK immigration, a UK ETA is required (UK Border Force, 2025).

De UK ETA uitgelegd system launched in October 2023, was extended to the USA, Canada and many others on 8 January 2025 and to most European nationals on 2 April 2025, and now covers 83 nationalities on the Appendix ETA National List. Furthermore, the transit rules are among the most frequently misunderstood aspects of the scheme. Airlines may deny boarding if the ETA requirement applies and has not been met, even for a simple connecting flight.

Do You Need a UK ETA for a Connecting Flight Through Heathrow?

For most ETA-eligible travellers on connecting flights through Heathrow, Gatwick, or other UK airports, a UK ETA is required unless a specific transit exemption applies. The current temporary exemption covers only passengers who stay airside and never pass through UK border control. A purely airside connection at Heathrow or Manchester is currently exempt; anywhere else you normally clear the border, which does need an ETA. Check with your carrier before you fly, as the transit exemption is under review.

Transit Type	ETA vereist?
Airside transit, ETA-eligible passport	Not currently at Heathrow or Manchester (temporary exemption); at other airports you clear the border — ETA required
Landside transit, ETA-eligible passport	Yes — ETA required
British/Irish citizen transit	Geen
Valid UK visa holder transiting	No — existing visa covers transit

Required Documents for UK Transit in 2026

The documents to carry for UK transit in 2026 are: a valid passport, a UK ETA (for ETA-eligible nationals who clear UK border control), your onward booking, and any visa required for your final destination. For landside transit, Border Force may ask about your onward travel and where you will stay overnight, although there is no fixed accommodation requirement. Carry printed copies of all electronic documents.

Full document checklist for UK transit: valid passport (valid for the whole of your time in the UK); UK ETA confirmation email; confirmed return or onward ticket; visa for your final destination if required (e.g., US visa if transiting to the USA); proof of accommodation for overnight landside stays; and travel insurance documentation. The Doorlooptijden van Britse visa provides information on UK entry and transit rules in more detail.

Heathrow Transit — Terminal-Specific Rules

Heathrow has four operating terminals (T2, T3, T4 and T5; T1 is closed). Passengers connecting between terminals on the same ticket and using designated airside connections do not need to pass through immigration for the connection itself. However, connections between Heathrow and Gatwick always require landside transit — taking the train or a taxi between airports — which means passing through UK border control and requiring a UK ETA (UK Border Force, 2025).

Key Heathrow transit routes: connecting passengers move between T2, T3, T4 and T5 on transfer buses without passing immigration control, so changing terminal does not in itself require an ETA (the exception is a connection from an international to a UK domestic flight); Heathrow to Gatwick is always landside, requiring a UK ETA. The UK entry rules and visa requirements covers UK international entry rules that apply to these situations.

UK ETA for Transit: How to Apply

Transit passengers apply for the UK ETA in exactly the same way as any other traveller — through the official UK ETA app (iOS and Android) or the GOV.UK website. There is no separate “transit ETA” — the standard ETA covers both visits and transit. The fee is £20 per person and the ETA is valid for two years from issue or until your passport expires, whichever comes first. Apply at least 3 working days before your connecting flight; a decision usually arrives within 1 day but can take up to 3 working days (GOV.UK).

The application does not ask for your flight details or itinerary, and there is no separate transit category, so the same ETA covers transit and future full visits to the UK. The Home Office does not publish processing-time statistics; GOV.UK says you will usually get a decision within 1 day, and most app users receive an automated decision within minutes.

What Documents Do Children Need for UK Transit?

Children transiting through the UK need the same documents as adults, including their own UK ETA if they hold an ETA-eligible passport. Additionally, unaccompanied minors may face additional checks at the UK border. For children travelling as part of a family: each child needs their own ETA on their own passport; if only one parent is travelling, carrying a consent letter from the absent parent is advisable (it is not an ETA requirement); and children’s passports must be valid for the entire transit period (UK Border Force, 2025).

De UK visum voor kinderen explains UK entry requirements for children in more detail. Furthermore, for families with multiple children, ensuring all ETAs are linked to the correct, current passports before travel is essential to avoiding delays at the border.

Common Transit Mistakes to Avoid

The most common mistake for ETA-eligible passengers transiting through UK airports is assuming that a “transit” means no ETA is needed. That is right only for a purely airside connection, which is currently exempt; as soon as you clear UK border control an ETA is required. A second frequent error is booking separate flight tickets on different airlines and then discovering that baggage reclaim is required, which means landside transit and a mandatory ETA (UK Border Force, 2025).

Additional mistakes to avoid: assuming a US ESTA or Australian ETA covers UK transit (it does not — a separate UK ETA is required); forgetting that an ETA must be on the specific passport used for travel; not accounting for processing time (apply at least 3 working days in advance); and failing to check the destination country’s visa requirement. The UK toeristenvisaaanvraag is a useful reference for understanding UK entry conditions applicable to international travellers.

Veelgestelde vragen

Do I need a UK ETA just to connect through Heathrow?

Only if you clear UK border control. A purely airside connection at Heathrow is currently exempt. Check with your carrier before you fly, as the transit exemption is under review.

What if my connecting flight is less than 2 hours — do I still need an ETA?

The length of the transit does not affect the rule. A 90-minute purely airside connection is currently exempt, while any route through border control needs a UK ETA.

Can I enter the UK on a UK ETA obtained for transit purposes?

Yes — the ETA covers both transit and full visits. If you decide to explore the UK during a layover or on a future trip, your transit ETA can be used for a standard visit.

Do EU citizens need a UK ETA for transit?

All EU nationals except Irish citizens have needed a UK ETA since 2 April 2025 whenever they clear UK border control; a purely airside connection at Heathrow or Manchester is currently exempt. Check GOV.UK for the full list of ETA-eligible nationalities.

How do I prove I have a UK ETA at Heathrow check-in?

Your ETA is checked electronically by airlines and border systems using your passport number. There is no physical document. However, carrying the confirmation email as a backup is recommended.

What happens if I arrive at Heathrow without a UK ETA?

If your ETA-eligible passport does not have an associated ETA, UK Border Force may refuse entry. In practice, your airline will typically identify this issue at check-in and deny boarding at the departure airport.

Last updated: October 2026

Airside Transit vs Landside Transit — Why It Decides Everything

The single most important question for any UK connection is whether you stay airside or cross the border. At Heathrow, transferring between flights inside the same terminal or via the airside transfer buses usually keeps you airside; at Gatwick, the current airside ETA exemption does not apply (it officially covers only Heathrow and Manchester), so get an ETA if you connect there. But collecting checked bags, switching to a separate low-cost booking, changing airports entirely, or an overnight layover all force you landside — and the moment you cross the border, full entry rules apply to you exactly as they would to a tourist arriving for two weeks.

Plan around your booking type. A single through-ticket means the airline transfers your luggage and a missed connection is their problem; two separate tickets mean you clear the border, collect bags, re-check, and absorb any delay yourself. Build at least three hours for a self-connect at Heathrow or Gatwick, and treat anything under two hours as a gamble.

Documents Checklist for Connecting Passengers

• Passport valid for the whole journey, the same one your authorisation is linked to.
• Onward boarding pass or booking confirmation, accessible offline — airline desks ask for it more often than border officers do.
• Proof of your final destination’s entry requirements, since UK check-in agents verify you can board the next leg.
• Any visa needed for the destination country — the UK leg is only as smooth as the rest of the itinerary.

When Things Go Wrong Mid-Connection

Delayed inbound flight? If both legs are on one ticket, go straight to the airline transfer desk — rebooking is their duty and accommodation may be covered on long overnight waits. On separate tickets, speed matters: airline apps reissue boarding passes faster than queues do, and explaining your situation at the border with documents in hand keeps the crossing quick. eGates handle most eligible nationalities in seconds, which is a genuine advantage when a tight connection turns critical.

Do children need their own documents for a transit?

Yes — every passenger, including infants, needs their own valid passport and their own authorisation when crossing the border. Family applications are submitted individually, so verify each child’s details against their own passport, not a parent’s.

Can I leave the airport during a long layover?

Once you have legally entered, yes — a twelve-hour layover is enough for central London and back via the Elizabeth line or Gatwick Express. Just respect the return-time maths: be back three hours before departure, and remember rush-hour trains add real risk to tight schedules.