I am going to be on holiday in Thailand during December this year and spend some time in the country. I was wondering if I can I apply for a tourist visa with one way ticket?
No, you cannot apply or even enter Thailand on a Tourist visa on a one-way ticket. The Embassy or consulate will refuse your visa application if not being able to provide proof of return or outgoing ticket from Thailand. In order to apply for a Thai Tourist visa, you must present itinerary or confirm paid ticket showing arrival and departure date as well.