Flight requirements

Hi.l wonder if you could clarify this.

Both ,my local travel agencies in England, wont sell a one way to BKK due to not  having confirmed onward departure.

Is this true


Thanks

Hi.l wonder if you could clarify this.
Both ,my local travel agencies in England, wont sell a one way to BKK due to not having confirmed onward departure.
Is this true
Thanks
-@Pursatacd1

Yes, you're "officially" not allowed to buy a one way ticket to Thailand as a tourist. If arriving on a 90 days Non-immigrant O Visa or a Long Stay Visa, a one way ticket is allowed.