Do I need a verifiable flight ticket or is a dummy ticket sufficient for Thailand e-visa?

When I came I just booked round trip because one way was almost same price 5 years ago

Take it from me, I recently bought one of these burner tickets for about $25, it was from a well recommended company. What arrived in my email looked like a child typed it out in Word. It looked so bad that i didn't date to present it at immigration, it OBVIOUSLY looked fake.

Now i gad someone run the booking number, a travel agent friend and the reference number existed but he said the booking looked weird, not fully processed in the system. He shook his head.

I wouldn't use one again, better to try and talk your way out of not having a return ticked than get caught with something dodgy looking like this.

For a visa application, it's probably best to use a refundable ticket if possible.

Most onward travel tickets are only valid for 24-48 hours, which means if they wanted to check your itinerary, they would likely not find anything by the time they checked.

Some of the sites allow you to pay extra to ensure it's valid for longer.

But most embassies don't even ask for a ticket, they just ask for the planned date of travel and possibly a flight number.