Holding two passports can make international travel more flexible, but it also raises important questions when applying for a UK Electronic Travel Authorisation (ETA).

If you have dual nationality or hold more than one valid passport, it’s essential to understand how your UK ETA is linked to your travel document. Using the wrong passport could result in delays or even being denied boarding.

This guide explains the UK ETA rules for travellers with two passports.

Is a UK ETA Linked to Your Passport?

Yes.

A UK ETA is electronically linked to the passport you use when submitting your application. Unlike a paper visa, there is no physical document or sticker.

When airline staff or UK Border Force officers check your travel authorisation, they verify the passport number associated with your ETA.

This means your ETA is only valid when travelling with the same passport used during the application.

Can I Choose Which Passport to Use?

Yes, provided you meet the eligibility requirements.

If you hold two passports, you should apply using the passport you intend to use throughout your journey to the United Kingdom.

For example:

• Passport A → ETA approved → Travel using Passport A ✅
• Passport B → ETA approved for Passport A → Travel using Passport B ❌

Your ETA will not automatically transfer to another passport.

What Happens If I Travel With the Wrong Passport?

If you arrive at the airport using a different passport from the one linked to your ETA, the airline may not be able to verify your travel authorisation.

This could lead to:

• boarding being refused;
• additional checks before departure;
• delays at the airport; or
• the need to submit a new ETA application using the passport you intend to travel with.

To avoid disruption, always carry and present the passport linked to your ETA.

I Have Renewed My Passport. Is My ETA Still Valid?

Usually, no.

Because an ETA is linked to a specific passport number, obtaining a new passport generally means you must apply for a new UK ETA before travelling.

Even if your previous ETA has not expired, it cannot normally be transferred to a newly issued passport.

I Hold British and Another Nationality

British citizens do not need a UK ETA.

If you hold British nationality alongside another nationality, you should normally travel using your British passport when entering the UK.

Travelling on your foreign passport may create unnecessary complications if an ETA would otherwise be required for that nationality.

What About Irish Citizens?

Irish citizens are exempt from the UK ETA requirement.

If you hold an Irish passport, you do not need an ETA to enter the United Kingdom, regardless of whether you also hold another nationality.

I Have a UK Visa in One Passport

If your valid UK visa is linked to one passport while you also possess another passport, you should travel according to the conditions attached to your visa and passport.

Before travelling, make sure your passport and immigration permission remain valid together.

What If One Passport Expires?

If the passport linked to your ETA expires, your ETA will no longer be usable.

After receiving your new passport, you should submit a new ETA application before your next trip.

Tips for Travellers With Dual Nationality

To avoid problems at check-in or border control:

• Apply using the passport you will travel with.
• Use the same passport throughout your journey.
• Check your passport’s validity before applying.
• If you renew your passport, apply for a new ETA.
• Keep both passports with you if your journey involves different immigration requirements.

Final Thoughts

Having two passports does not make applying for a UK ETA more complicated, provided you follow one essential rule: always use the same passport for your ETA application and your journey to the UK.

If your passport changes or expires, you should expect to submit a new ETA application before travelling. Taking a few minutes to verify your travel documents can help you avoid delays, refused boarding, and unnecessary stress.