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Need ETA confirmation.

Posted by fb132 on 09/14/25 05:37 PM

I booked a flight with BA from Montreal to LHR then 3 hours later, i connect a flight from LHR to Bucharest (Yes also with British Airway).

Since I'm connecting a flight, my initial thought is that I do not need the ETA if i understood the ETA website, am I correct?

One thing I noticed is I arrive in Terminal 5 from my flight from Montreal, but I need to be at Terminal 3 for my connection to Bucharest. I read somewhere that when you're at a different Terminal, I would need to apply for ETA.

It confuses me.

Posted by Johnew52

Preston UK

09/14/25 05:42 PM

1646 posts

If your flights are all on one ticket you will be able to stay airside and will therefore not need an ETA.

If the flights are two separate bookings, even if they are both on BA, you will need to transfer land side, collect your bags, pass through immigration and then transfer to T3 and re-check yourselves and your bags. In this case you would need an ETA. And 3 hours might very well not be long enough.

Posted by fb132 OP

09/14/25 05:45 PM

54 posts

It's on the same booking ticket. So i guess no need to apply, thanks.

Posted by AmandaR

London, UK

09/14/25 05:57 PM

550 posts

Just make sure you follow the purple signs at Heathrow that will take you from terminal to terminal without going landside/ through immigration. You will probably have to go through security again, but that’s different.

Posted by Paul

Eastern Iowa, USA

09/14/25 06:06 PM

8854 posts

If you have not seen it, here is a link to the Heathrow site, that will tell you about your connection:

https://www.heathrow.com/connecting-flights

Posted by Frank II

Freedonia

09/14/25 08:07 PM

17867 posts

How it works is this......when you land at Terminal 5 you follow the Flight Connections signs and will board a bus to Terminal 3.

At Terminal 3 you will go through security and then be free to go to your gate.

You will stay airside, not have to go through immigration and will not need an ETA.