Hi all. Venerable son just received his UK passport in Thailand.

I want him to come and visit me in the UK. He is an adult.

Please let me know your child's experience with what I think is what has to be done:

1. I book a flight from BKK to UK with his British passport, not Thai passport

2. He carries both anyway

3. Checks in with UK passport

4. Shows Thai Immigration his Thai passport

5. In the UK, he shows his British passport

6. Exits the UK with his British passport

7. Entering Thailand he shows his Thai passport.

Am I missing anything? Any corrections or suggestions? Caveats?

Thanks.

3 minutes ago, Somtamnication said:

Hi all. Venerable son just received his UK passport in Thailand.

I want him to come and visit me in the UK. He is an adult.

Please let me know your child's experience with what I think is what has to be done:

1. I book a flight from BKK to UK with his British passport, not Thai passport

2. He carries both anyway

3. Checks in with UK passport

4. Shows Thai Immigration his Thai passport

5. In the UK, he shows his British passport

6. Exits the UK with his British passport

7. Entering Thailand he shows his Thai passport.

Am I missing anything? Any corrections or suggestions? Caveats?

Thanks.

Correct procedure. Shouldn't be any hiccups.

My only concern is when exiting Thailand, immigration sees that his boarding pass passport number does not correlate. Maybe I am thinking way too much. And no issues that he is a dual national, which I hear, is prohibited in Thailand.

2 hours ago, Somtamnication said:

My only concern is when exiting Thailand, immigration sees that his boarding pass passport number does not correlate. Maybe I am thinking way too much. And no issues that he is a dual national, which I hear, is prohibited in Thailand.

Thai citizens don't need the boarding pass for immigration.. they use the electronic gates (passport only).

3 hours ago, Somtamnication said:

Hi all. Venerable son just received his UK passport in Thailand.

I want him to come and visit me in the UK. He is an adult.

Please let me know your child's experience with what I think is what has to be done:

1. I book a flight from BKK to UK with his British passport, not Thai passport

2. He carries both anyway

3. Checks in with UK passport

4. Shows Thai Immigration his Thai passport

5. In the UK, he shows his British passport

6. Exits the UK with his British passport

7. Entering Thailand he shows his Thai passport.

Am I missing anything? Any corrections or suggestions? Caveats?

Thanks.

Yeah, easy. My 16 year old daughter did this exact journey last year. Not a problem. Exactly as you describe.

My son's have been using the process you describe to visit the UK for nearly 20 years, never any problems.

Checks in with British passport AT AIRLINE DESK

Shows Thai Immigration his Thai passport (if recent passport will have chip so can exit through digital gates)

In the UK, he shows his British passport (goes through immigration desks for British)

CHECKS IN WITH THAI PASSPORT AT AIRLINE DESK

Shows UK Immigration his British passport

Entering Thailand he shows his Thai passport (if recent passport will have chip so can enter through digital gates)

37 minutes ago, Bredbury Blue said:

CHECKS IN WITH THAI PASSPORT AT AIRLINE DESK

Shows UK Immigration his British passport

Entering Thailand he shows his Thai passport (if recent passport will have chip so can enter through digital gates)

This one has me confused. Why check in with the airline in UK with Thai passport if ticket was purchased using his UK passport? Airlines don't look for a visa, as they would coming from Thailand to the UK?

47 minutes ago, Somtamnication said:

This one has me confused. Why check in with the airline in UK with Thai passport if ticket was purchased using his UK passport? Airlines don't look for a visa, as they would coming from Thailand to the UK?

My error. Forgetting Brits get visa fee entry these days. However, there are reports of airlines requiring you to show a TDAC at checkin, and if you show Thai passport then there'll be no questions on right to enter Thailand from airline staff.

7 minutes ago, Bredbury Blue said:

My error. Forgetting Brits get visa fee entry these days. However, there are reports of airlines requiring you to show a TDAC at checkin, and if you show Thai passport then there'll be no questions on right to enter Thailand from airline staff.

If on a one-way ticket, or return ticket longer than visa free entry, airlines may want to see evidence of right to stay in Thailand (such as Thai visa or Thai passport). My (ex) Thai wife and son have both UK and Thai passports and do exactly as in OP with no issues. Will definitely need to show British passport in Bangkok when checking-in. Yours is a common situation and nothing to worry about. I've never been asked to see TDAC at check-in or at immigration on arrival. Just need to ensure it's been done.

1 hour ago, soi3eddie said:

I've never been asked to see TDAC at check-in or at immigration on arrival. Just need to ensure it's been done.

I've also never been asked to show TDAC on checkin but reading threads today I believe some people have been asked to show or complete TDAC at airline checkin (which is wrong as you can do it on arrival if you wish).

On 4/16/2026 at 11:51 PM, Somtamnication said:

Hi all. Venerable son just received his UK passport in Thailand.

I want him to come and visit me in the UK. He is an adult.

Please let me know your child's experience with what I think is what has to be done:

1. I book a flight from BKK to UK with his British passport, not Thai passport

2. He carries both anyway

3. Checks in with UK passport

4. Shows Thai Immigration his Thai passport

5. In the UK, he shows his British passport

6. Exits the UK with his British passport

7. Entering Thailand he shows his Thai passport.

Am I missing anything? Any corrections or suggestions? Caveats?

Thanks.

In 2014, my children (three nationalities) came to Thailand on their Australian passport. Three months later, immigration at the exiting BKK airport wanted to fine my children for overstaying. My then wife presented their Thai passports. An argument ensued. Yes, odd as it seems, Thai people do like to argue. Immigration let her off with a warning. Our children were supposed to only the same passport when entering and exiting Thailand. A few years later, my now adult daughter travelled around the world on her German passport. God knows why. She left all other passports at home. When wanting to depart from the US back to Australia, she had to apply for an e-visa at the airport which was declined because the system knew she had an Australian passport. Australians aren't entitled to an entry visa because they don't need one. But because she left her Australian passport at home, she couldn't board the flight. Someone had to send her Australian passport to the US so she could book a new flight. Who knows what will happen. Make your own enquiries and get it in writing.