What are the requirements for an onward ticket when entering Thailand on a 45-day visa exemption?

No

Depending on the airline. I've had trouble with this leaving Canada and got lucky when I convinced a supervisor I can change my visa in Thailand and or apply for extensions. Having a passport full of visas and extentions was helpful.

i always have a return or and outbound ticket, but in 20 years and flying into Thailand about 8 times a year I have never been asked. I have always flow from Europe or Singapore

For 15$ you can get. a reservation and print out your exit flight ticket

depends on the airline and on the attendant who was hired for 3 hours to take caRe of your check in . so be aware she or he don't give a s***.

so good luck the mood of these peoplemayvary dependingon how they woke up ,what did they eat , how was last might etccc...

hope for the bezt and be ready for the worse 🤣🤣🤣🤣

You don't need onward travel for the tourist stamp. Only needed for the tourist visa. I've never been asked when being stamped in. The last time I came in was last month.

If you are entering on a long term visa, like a Non O or Non OA, Non B or Thailand Elite you do not need an onward flight out from Thailand.

If on a visa exempt entry or tourist visa you may well need to have a flight ticket out of Thailand within the amount of days that your initial entry allows, regardless that you can get an extension in country. It doesn’t need to be a return ticket, any ticket out of Thailand will suffice.

In theory immigration can deny you entry if you don’t but they rarely ever would, because they know you can get an extension.

Almost always the hang up will be when you try to board your plane. Many airlines will not allow you to board without an onward ticket within the number of days.

Some will let you. Many won’t. Short haul carriers probably won’t care, but for long haul carriers they probably will. If you don’t have an onward ticket it’s the carriers responsibility (at their expense) to return you to your point of departure should immigration deny you entry for some reason.

You probably don’t want to be the one scrambling to buy an onward ticket at the check in desk. Best option is a changeable ticket, and just change the date when you’re here.

Alternatively you can Google “onward flight ticket” and you’ll find a plethora of companies willing to sell you one for around $10. A real ticket, Phuket to Singapore, would be approx £25/$35 depending on the time of year. Bangkok to Cambodia would probably be similar.

You’ll probably get a number of replies saying “I managed to enter with a one way ticket no problem, therefore you won’t have one either.” They’ve been to Thailand 20 or 30 or 100 times and haven’t been asked so they assume that no one else on the planet has ever been asked either.

When you get to the check in desk you’ll find out which way it’ll go for you. Be prepared. You might get away without one, but do you want to take that gamble?