Can I travel to Thailand from Spain without a visa and use a bus ticket as proof of onward travel?

search on Google onward flights.

they will book you a flight back and cancel it after some days.

price 5-10 euro and everything is fine

Well you will have to apply for a Thai pass to come to Thailand. I can say that I only uploaded the one way flight I bought to come to Thailand and was never asked to show proof of departure. If you want to stay longer look into the rules for applying online at the Thai Embassy in your country, you might be able to get a 60 day visa (good for 90 days) well before your flight.

30 day TR on arrival...

You will need to show a return or onward flight. It will be checked when you try to board. Done it twice. As for extension, believe you can, I haven’t needed to. So no experience.

With the stv you'll have the problem that you need proof of accommodation payment for the duration of stay. I recommend 60 day tourist visa+30 days extension for 1900 bht.

I've never been asked for an onward ticket, neither at embarkation nor disembarkation!

Not even when I traveled to sandbox Phuket.

When applying for the visa and Thailandpass it is sufficient to just put in the date, time and flight number out of the country. That you can google. Just search for example, Emirates BKK to MAD + date flight number!

Hope I could help!

Bus ticket is not good enough. Borders are still closed except when you fly. But then you have to redo your Thai Pass, . . . Just buy a return tickets that allows to change the departure date. And go to immigration, pay 1900 baht and ask for 30 days extension.

You should check the price of a return ticket. I bought a Malaga Bangkok return ticket for 372 EUR with KLM some weeks ago. One way would have been about 540 EUR.

Google "onwardticket"... for 10 USD, you are out of troubles... Worth the money ! ;-)

Have a look at this webpage

You can buy a return ticket for after 60 days. At check-in, if someone asks for it, you can tell them that you will get a visa extension in Thailand.

Bus ticket as proof should be fine.

For the most part the only place you will have trouble with needing proof of leaving the country is when you go to checkin to your flight. Just show them the bus ticket and they should let you board. They likely will not ask once you arrive in Thailand.

Why not get a 60 day visa at the embassy in Madrid only 35 euro no hassle staff are friendly .

You can buy a flight that is 100% refundable... and once you get there, you just cancel it... Works well.

Buy a $10 onward ticket, and have it activated 24h before flying to Thailand.

No

A bus ticket to Cambodia??? Are you aware land borders are closed???

yes

Google onward flight.

You can get 30 days without visa and 30 day extension after that.

A bus ticket would not work because of the boarder is not open between Thailand and cambodia by land. Get a cheap refundable ticket to malaysia or hong kong by plane.

To stay longer you can get a tourist visa which gives you 60+30 days or try with STV for 270 days.

Get a STV, website embassy madrid. Its 90 days.