Hi.

I'm 20-years old British Citzen, and will be visiting Thailand and Malaysia this summer.

I will be flying into Bangkok and out of Singapore and do not expect to stay in Thailand longer than 30 days. Do I need a transit visa or will a free 30-day visitors stamp suffice.

Many Thanks.

Chris.

To be sure you are allowed on the plane would highly recommend you obtain a tourist visa prior to travel. The 30 day stay without visa requires onward ticket out of Thailand within 30 days and you don't appear to have that. Although the airline might not check, or might listen to your explanation, they are the ones at risk for fine and your return if immigration were to say no so they have every right to refuse to carry you.