you don't do a "visa run". What you are doing is a "border run". It would be a "visa run" if you visited the Royal Thai Consulate in Savannakhet and apply for a visa
If you are flying to Thailand a one-way ticket without a visa, you can expect that the airline will ask you to provide proof of onward travel from the destination country within the expected length of stay stamped upon entry. In your case it’s a 60-days visa exempt entry.
It does not necessarily have to be the "return flight". It CAN be a return flight. But it can also be a one-way flight "out of Thailand" within the permitted period.
For example, a cheap one-way ticket with Air Asia from Hat Yai to Kuala Lumpur for 35.- USD, is a 100% secure onward travel proof
Even if you have a visa, the airline can ask for proof of onward travel if you are leaving Thailand outside the length of stay stamped upon entry, or if you want to fly with a one-way ticket.
They "can", they don't necessarily do so. But if the check-in crew implements the rules consistently, they will definitely ask for it.
Because this IATA rule does in fact EXIST, even if many people don't believe it or want to accept it, just because they have never been asked for proof of onward travel.
The penalty for the airline that does not follow the rule is 10,000 U.S. Dollar if the passenger is rejected at the border of the destination country.
And if a flight is overbooked, the airline uses the onmward travel proof a proven means of thinning out the number of passengers. And that's what they will do!
Thai immigration normally is not interested in proof of onward travel or the return flight. They only ask for it randomly - this usually happens to those entering the country who have an extensive stamp history in their passport or passengers who turn up in ragged clothing.
The airline is only enforcing a guideline from Thai immigration. The IATA, as the highest aviation authority, has committed to applying these guidelines. And because Thai immigration has passed the check-duty to the airlines, it does not check again when you enter the country. They tacitly trust the airlines did check already
It is also important to know that many airlines do NOT accept a train or bus ticket to a neighboring country as proof of onward travel, but insist that it must be a FLIGHT ticket.
** You also often read that you can provide proof by booking a hotel in a neighboring country.
** Or by presenting a visa for the neighboring country.
** Or by signing a form in which you accept responsibility in the event of entry being refused.
** Or by taking a speedboat ride from Ko Lipe to Langkawi.
** or a bus ticket to Cambodia
** or a train ride to Singapore
** with a cheap "onward ticket" you can also provide proof of onward travel (but at your own risk)
These are ALL just half-hearted suggestions. There is NO guarantee that it will work. The airline decides whether to accept it or not
Of course there are people in every group who claim the opposite, but they can NEVER GUARANTEE their statements
Where as a “real” one-way flight ticket out of Thailand is always a 100% guarantee
Then there are people who firmly claim that the proof of onward travel does not exist, just because they have never experienced anything like it
But these people can never guarantee that you will not be asked. Such a behavior is irresponsible towards those asking in FB groups
There is NO guarantee that you will not be asked at check-in. It could just as easily be the other way around and proof of onward travel will be asked.
Then you are left standing at the check-in counter and will be refused boarding.
That is why I don't think it is a good idea to present your own experience as irrefutable. Thousands of travelers have been turned away in the past, and HUNDREDS face this problem EVERY day at airports around the world
What kind of proof of onward travel will be accepted, you should ask the airline, but it is best to do so in writing (email) In this case if you receive a positive reply, you can print it and take it to the check-in counter. Over the phone, airline employees sometimes tell you anything whatever comes to their mind, much of it might not be true.
you got "flagged" in the central computer system of Immigration, which means if you try a border run after January 6, it will pop up on the computer of every border officer, and you need to have a "plan B" ready in case you will get refused entry. . . Sorry for the bad news but it is what it is. Don't try to extend stays in Thailand solely based on visa-exempt entries and their extensions. Get a proper visa that fits your purpose, like a multi entry tourist visa or a DTV based on "Soft Power"
the 7-days are NOT an extension. The 7-days is a stamp that says "application denied, you have 7 days to leave the kingdom" and it will cost 1900.- THB
closed on saturdays and sundays, and closed on December 5th (Bhumipol's B-day, and on December 10. If you really want the 7 days on top, then you need to go on the very last day of your existing stay permit. Can't apply one or more days earlier
the problem is, the 7-days grace period starts on the day your application gets denied . . you gotta figure out how that plays with your timeline. It means that if you visit Immigration on the last day of your EOS, the 7 days start the next day
„and for some reason the IO gave me a visa expiration date of 29 November 2025”
No. He didn’t give you a “new visa expiration date”
He gave you a STAY PERMIT which is valid until November 29, 2025
Your “visa expiration date” is still December this year.
After the expiry of your visa validity, you have no re-entry permit any more.
So if you were to exit Thailand in February for a few weeks, you would need to buy a single re-entry permit in order to keep your stay permit until 29 November 2025 alive.
You do not have to do the “1-year extension of stay permit” by next week, yet.
You can wait until 29 October 2025, before you apply for the “1-Year Extended Stay Permit”