What are the risks of entering Thailand with a one-way ticket and planning to extend my stay?

Whether you'll have a problem entering or not cannot be explained with certainty by anyone in this group or outside this group. It depends on whether you're unlucky enough to be flagged out or not, by the airlines and/or Thai immigration.

1. If you're lucky, you'll just pass by freely, no questions asked. I can say in my travels to Thailand, I've been asked once by the outgoing airlines and they insisted to see the email of the outgoing flight, not just a picture of the ticket. So your 'chances of success' is high. If you're satisfied with this, then you don't have to read on.

2. If you're unlucky enough, then you'll be asked to show proof of the outgoing flight 60 days later and not 90 days or even 61 days later. If flagged by your airline, you'll be denied boarding. If flagged by Thai immigration, they'll ask you to buy an outgoing ticket on the spot or deny you entry into Thailand. This process is not unique to Thailand but to all countries I've visited.

Now the the choice is yours to make. No one here can give you a definite answer. Btw, just saying...a 1 way ticket from phuket to kl is around 1000 to 1250b. It beats your £150 flexible ticket charge

You will fine buddy

No worry's 👌

IMPORTANT...

When calculating your visa exemption entry duration keep in mind your day of entry is counted as day 1 of your 60 days entry..

That's regardless of the time of day you arrive..

You can pass through immigration at 11.30pm at night with only 30 minutes left in the day and that day is still considered day 1 of your 60 days...

This catches out a few people who end up with a 1 day overstay because they booked a flight out of Thailand 1 day too late..

DO NOT deliberately overstay your visa exemption..

When you check some recent posts, there are several people that were denied boarding to Thailand without an confirmed booking leaving Thailand within 60 days.

This is because the airline is legally responsible to take you back to your origin, if you don't meet the immigration requirements for your legal entry. The airlines are required to check each passenger's eligibility to enter a foreign country. As you expect to enter as a visa exempt tourist for a maximum of 60 days, they are completely in their right to refuse you travel. They don't care, that you plan to get the 30 day extension.

Therefore, it's the easiest to book a cheap ticket out of Thailand within the first 60 days ( even a cheap bus ticket to Laos, or an cheap Air Asia flight to Malaysia) is sufficient. Then you are definitely on the safe side.

By rules to be allowed visa exempt you need to have return or onward ticket within 60 days, regardless of your intentions of extending. So buy cheap onward ticket, if you don't want to gamble.

Yep eg Air Canada will ask and not allow you to board if no return within 60 days. Just because you say you will extend does not mean you will. Buy an Onward Travel flight (about $15) and save yourself some worry.

Without a 'long term' visa you'll most likely need onward travel within 60 days, boarding your flight will be the major hurdle but Thai Immigration can also ask for onward travel within 60 days regardless of the fact you can apply for a 30 days extention.

The airline will ask you and the TDAC (I did it today) will also ask for the visa number, arrival and departure, as well as the booked flight number.

if you fly EMIRATES they allow a return flight with them within 90 days. Other airlines you should ask if they let you board on a ticket out AFTER 60 days

I got stopped but let in never asked about return ticket.

The airline going out might have something to say. So you may have to book a throw away flight other than that you should be ok

Can book a bus out of Thailand too,its cheap,is considered onward travel,just cancel if not needed.

No issues. Just explain to your airline when you check in . They will ask

Do you have a long history spending time in Thailand as a tourist in 2025? If not, then immigration in Thailand won't be your problem. They very rarely ask for proof of onward travel, unless they are looking for a reason to deny entry.

More often it is your airline that will ask for this. So you need to find out what your airline policy is as far as proof of onward travel goes for someone who is going without a visa to Thailand. And if they require that proof to be within 60 or 90 days.