UK ETA for en forbindelsesflyvning gennem Heathrow 2026

You need a UK ETA for a connecting flight through Heathrow if you pass through UK border control between flights; if you stay airside and never cross the border, you do not. The £20 authorisation is decided by one thing: whether your itinerary takes you landside. Always confirm with your airline, because Heathrow connections vary by ticket and baggage routing (GOV.UK).

TL;DR: An airside connection at Heathrow, with no border crossing, needs no ETA. A landside connection, where you clear passport control, needs a £20 ETA that lasts two years. If you are unsure, apply anyway or check with the airline before you fly (GOV.UK).

Key facts at a glance

• The rule: an ETA is required only if you pass border control landside (GOV.UK).
• Airside transit: no border crossing means no ETA needed, under a temporary exemption the Home Office keeps under review.
• Det koster: £20, valid two years or until your passport expires.
• Decisions: usually within one day (up to three working days), with most app decisions within minutes (Home Office, 2026).
• Heathrow scale: more than 83 million passengers passed through in 2024 (Heathrow).

Connection type	ETA needed?
Airside, no border control	Nej
Landside, through passport control	Yes, £20
Change of airport (e.g. Heathrow to Gatwick)	Yes, £20
Overnight stay before onward flight	Yes, £20

Connecting elsewhere too? See our guides on stopovers via Iceland or Norway og den Eurostar and Channel Tunnel rules.

Do you need a UK ETA for a connecting flight through Heathrow?

A connecting flight through Heathrow needs a UK ETA only when your route sends you through passport control before your onward departure. The Home Office is explicit: you need an ETA if you are “passing through border control at a UK airport before continuing your onward journey” (GOV.UK). Stay airside, and the rule does not apply.

The trouble is that Heathrow does not treat every connection the same way. Some transfers keep you entirely airside in the international zone; others send you through the border because you must collect and re-check bags or are connecting to a UK domestic flight; a terminal change alone uses an airside transfer bus with no passport control. Your airline knows which category your specific booking falls into, so ask before you assume.

Take Kenji, flying Tokyo to Toronto with a three-hour Heathrow stop on one ticket. His bags were checked through and he never left the airside transit area, so he needed no ETA. Now picture a traveller whose two flights are on separate tickets with different airlines: they often must collect bags landside, which means passport control and a £20 ETA. Same airport, different answer.

Airside versus landside transit at Heathrow

Airside transit means you stay within the secure international zone and never cross the UK border, while landside transit means you clear passport control and legally enter the UK. That single line decides your ETA status more than terminals, timings or airlines do.

Here is how to tell them apart:

• Airside signs: you follow “Flight Connections”, keep your bags checked through, and never queue at UK Border.
• Landside signs: you see “Arrivals” and “UK Border”, collect your luggage, or leave the terminal.
• Separate tickets: two unlinked bookings usually force a landside re-check, so plan for an ETA.
• Airport change: moving from Heathrow to Gatwick, Stansted or Luton always means entering the UK.

Heathrow runs four passenger terminals, linked airside by transfer buses, so changing terminals does not by itself involve the border (connections onto UK domestic flights are the exception). If your journey shifts you to another London airport, read our London transport guide for the fastest links, including the Elizabeth line into the city in about 40 minutes.

Timing matters as much as paperwork. Heathrow advises a minimum connection time of around 60 to 90 minutes for airside transfers, and longer when a terminal change is involved. A landside connection eats far more of that clock, because you queue at the border, reclaim bags, and re-clear security. Build in the buffer, and hold your ETA in advance so a document check never adds to the delay.

Transfer scenario	Border crossed?	Rough time needed
Same terminal, airside	Nej	60–75 minutes
Terminal change, airside	Nej	90+ minutes
Landside re-check	Ja	2–3 hours

When your Heathrow connection means passing border control

Your Heathrow connection means passing border control whenever you switch to a separate ticket, change airports, stay overnight, or an airline cannot through-check your baggage. In each case you legally enter the UK, so a £20 ETA becomes mandatory before you travel.

These situations catch people out most:

1. Two separate tickets: you reclaim and re-check bags landside, which means going through UK border control.
2. Airport swap: a Heathrow arrival and a Gatwick departure needs full UK entry.
3. Long layovers: an overnight connection with a hotel outside the terminal means entering the UK.
4. Baggage limits: if your carrier cannot tag bags to the final stop, you go landside to collect them.

If any of these match your trip, treat the ETA as essential. Confirm your own passport rules first in our country guide by nationality, and check the full cost in the £20 ETA fee breakdown.

Not sure whether your connection crosses the border? You can apply directly on GOV.UK for £20, or let us check your itinerary and submit the application so a tight layover is never at risk.

How to apply for the ETA before your connection

Apply for your ETA online at least three working days before your Heathrow connection, using the official app or the GOV.UK service. Most approvals arrive within minutes, but that buffer protects you if your case needs a manual check.

The process is quick:

1. Open the official service. Brug den GOV.UK ETA app or web form, or apply with our checked service.
2. Scan your passport and photo. The app reads the chip and matches your face.
3. Besvar egnetheds spørgsmålene og betal £20. Én ETA dækker flere ture i to år.
4. Vent på e-mail-bekræftelsen. ETA links digitalt til dit pas, så der er intet at udskrive.

Rejser du med børn, der også forbinder? Hver passager har brug for deres egen ETA, som vores ETA-omkostninger for børn og gruppe- og familierejser guides forklarer.

Hvad sker der, hvis du forbinder gennem Heathrow uden en ETA?

Uden en påkrævet ETA kan et flyselskab nægte at sætte dig ombord på flyvningen til Heathrow, fordi flyselskaberne kontrollerer godkendelsen ved afgangsporten. Problemet opstår, før du nogensinde når Storbritannien, hvilket er grunden til, at en manglende ETA afslutter turen på den første lufthavn, ikke på Heathrow.

Luftfartsselskaber risikerer bøder for at transportere passagerer, der mangler de rigtige dokumenter, så de håndhæver reglen strengt. Hvis du nogensinde bliver opdaget, er vores guide om hvad du skal gøre ved afvisning af boarding dækker det hurtigste helbredelse. Ankommer du med privatfly i stedet? ETA-kravet gælder stadig, med ekstra flyrapporteringstrin, som vores ankomstguide til privatfly viser.

Ofte stillede spørgsmål

Do I need a UK ETA if I only change planes at Heathrow?

Only if you pass through UK border control. A purely airside connection with no border crossing does not need an ETA, but you should confirm your route with your airline.

How do I know if my Heathrow connection is airside or landside?

Ask your airline. Signs of a landside transfer include collecting your bags, separate tickets, an airport change, or following “Arrivals” and “UK Border” rather than “Flight Connections”.

Does a connection between Heathrow terminals need an ETA?

Not by itself. Transfers between Heathrow terminals run airside on connection buses without passport control. You need a £20 ETA if you collect bags, switch to a separate ticket, leave the airport or connect onto a UK domestic flight, because those steps take you through UK border control.

Do I need an ETA to connect from Heathrow to Gatwick?

Yes. Changing airports means legally entering the UK, so you must hold a valid ETA before you travel, regardless of how short the layover is.

How much is the ETA and how long does it last?

ETA koster £20 og forbliver gyldig i to år eller indtil dit pas udløber, hvilket dækker flere forbindelser og besøg i løbet af denne periode (GOV.UK).

What if my two flights are on separate tickets?

Separate tickets usually mean collecting and re-checking baggage landside, so you pass through UK border control. Plan on needing an ETA in that case.

Can I get a transit visa instead of an ETA?

Nogle nationaliteter bruger et transitivisum i stedet for en ETA. Kontroller, hvilket der gælder for dig på GOV.UK transitivisum-side før booking.

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Skrevet af Eleanor Winslade, Senior Travel Documentation Editor. Eleanor har dækket krav til indrejse i Storbritannien siden 2017 og kontrollerer hver guide mod den seneste officielle vejledning fra GOV.UK. Mere om forfatteren.

Senest opdateret: 2026-07-20 — bekræftet mod gov.uk-skema.

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