UK ETA for a Connecting Flight 2026: Airside vs Landside Transit

Whether your connecting flight needs a UK ETA comes down to one question: will you clear UK passport control? If you stay airside and simply change planes, you don’t need an ETA. If you go landside through immigration before your onward flight, you must have one. Below we cover the difference, the airports where it matters most, and how to plan a connection so nothing catches you out in 2026.

Kort sagt: On a connecting journey, a UK ETA is only required if you go through UK border control. Staying airside in transit doesn’t require one. If you have to collect bags, change airports or clear immigration, you need the £20 ETA, which visa-exempt travellers have needed since 8 January 2025.

Connecting through London? Our London airports guide for ETA travellers maps the terminals, and the broader Guide for transitt og mellomlanding i Storbritannia covers cruises and trains too.

Do you need a UK ETA for a connecting flight?

It depends entirely on border control. You must hold an ETA if you cross UK immigration before your onward journey, and you don’t need one if you transit airside without crossing the border. Your airline can confirm which applies to your specific routing.

The Home Office spells this out directly. Its guidance lists airside transit “without passing through border control” among the situations where no ETA is required, while landside transit “passing through border control at a UK airport” needs one (gov.uk UK ETA-veiledning, accessed 24 June 2026). The scheme has applied to visa-exempt travellers since 8 January 2025 and to EU nationals since 2 April 2025, so this question now affects a huge share of connecting passengers. When unsure, confirm your status on the gov.uk visumsjekk.

Airside versus landside transit: the key difference

Airside means you never leave the secure zone — you land, walk to another gate, and fly out without seeing a passport desk. Landside means you clear UK passport control, perhaps to collect and recheck baggage, change terminals on separate tickets, or switch airports. Only the landside route triggers the ETA requirement.

The practical catch is that not every connection can be done airside. At Heathrow, flight transfers are often possible without clearing immigration, and you can check transfer routes on Heathrow’s official site. But if your bags are not checked through to your final destination, or your two flights are on unconnected tickets, you will likely be sent landside — and then you need the £20 ETA. Separate visa rules can also apply to visa nationals, explained on the gov.uk transit visa page (accessed 24 June 2026).

Proff-tips: Always ask your airline whether your bags are checked through to the final destination and whether your transfer is airside. Those two answers tell you instantly whether the authorisation is required — far more reliably than guessing from your itinerary.

When a connecting flight does require a UK ETA

An ETA becomes mandatory whenever your connection forces you through UK immigration. The clearest triggers are changing airports, collecting and re-checking luggage, booking two separate one-way tickets, or any routing where the airline cannot transfer you airside. In each case you are legally entering the UK, even briefly.

Common situations that require an ETA include:

1. Switching airports — for example landing at Gatwick and flying onward from Heathrow means clearing the border.
2. Self-transfer tickets — two separate bookings usually force you to collect bags and re-check in landside.
3. Long layovers you leave the airport for — stepping into London for sightseeing means passing immigration.
4. Baggage not checked through — if you must claim your suitcase, you go landside and the charge applies.

If an airline ever wrongly insists you need an ETA during genuine airside transit, our notes on hva du skal gjøre ved nektet ombordstigning og transit, cruise and stopover guide help you respond calmly with the facts.

When you are exempt during airside transit

You are exempt when your entire connection stays airside. If you land, remain inside the international transfer area, and board your next flight without ever reaching a passport desk, no ETA is required — regardless of your nationality’s usual ETA status. The exemption is about the border, not the airport itself.

This is genuinely good news for many one-stop routes through the UK. A passenger flying, say, from Dublin to New York via Heathrow on a single connected ticket with bags checked through can often clear the whole journey airside. The same logic covers travellers transiting by rail in some cases — our Eurostar og Channel Tunnel-guide explains those scenarios. Even so, the Home Office repeats one piece of advice everywhere: if you are not certain, check with your airline before you fly.

One more practical point keeps people calm at check-in. The exemption is written into the official rules, so you can travel airside with confidence even if your nationality normally needs an ETA — the full list of who is exempt sits on the gov.uk ETA overview (accessed 24 June 2026). Picture a family flying from Amsterdam to Boston via Heathrow on one ticket: bags checked through, an airside transfer, and not a single passport desk between flights. They need no ETA at all. Change one detail — separate tickets, or a bag to reclaim — and the same family would need one each, children included.

How to apply and plan your connection

If you do need one, applying is quick and cheap. The £20 ETA takes about 10 minutes online, is usually approved within three working days, and lasts two years — so a single application covers future connections too. Sort it the moment you know your routing goes landside, not at the airport.

• Tip 1: Confirm airside or landside with your airline first, then apply only if needed via our hvordan søke om en UK ETA på nett guide.
• Tip 2: Book through-tickets with bags checked to your destination to keep more connections airside.
• Tip 3: If you are a US traveller, our UK ETA guide for US citizens covers the same transit rules with American examples.

One last habit saves money and nerves: apply once, then forget it. Because approval lasts two years and works for any number of trips, sorting the authorisation before your first landside connection means every later layover is already covered. Keep the approval email saved on your phone, and you can prove your status in seconds if an agent ever asks at check-in.

You only need to think about an ETA for a connection if you cross the UK border. Stay airside and you need nothing extra; go landside and you must pay the £20 fee in advance. Ask your airline whether your connection is airside or landside, and if the answer is landside, apply online early.

Ofte stilte spørsmål

Do I need a UK ETA when connecting at Heathrow?

Only if you clear passport control. Many Heathrow transfers happen airside with bags checked through, so no charge applies. If you must clear immigration or change airports, the £20 fee is due before you travel.

Is airside transit through the UK exempt from the ETA?

Yes. The Home Office lists transit “without passing through border control (airside)” as exempt. If you never reach a passport desk and simply change planes in the secure zone, no authorisation is required.

Do I need an ETA if I change airports in the UK?

Yes. Switching from one UK airport to another, such as Gatwick to Heathrow, means you clear immigration and re-enter for your onward flight. That counts as landside transit, so the fee applies.

What if my bags are not checked through to my destination?

You will normally go landside to collect and re-check them, passing through immigration. That brings the authorisation into play, even on a short connection. Ask your airline whether your baggage is through-checked before assuming you qualify.

How much does a UK ETA cost for a connection?

The same as any other ETA: £20 per person, set on 8 April 2026. It lasts two years or until your passport expires and allows multiple uses, so it covers future trips and connections as well.

How early should I apply before a connection?

Apply at least three working days before you fly, as some cases are referred for checks. Because the ETA stays valid for two years, there is no downside to applying as soon as you know your routing is landside.

Who decides whether my transit is airside or landside?

Your routing and airline do. The airline knows whether it can transfer you and your bags airside or must route you through passport control. Always confirm with them if your itinerary is unclear before you travel.

Last updated: 2026-06-24 — verified against gov.uk schedule.