What should travelers with a one-way ticket to Thailand know about immigration checks?

One way ticket and travel around SE Asia

This was our experience yesterday at BKK airport. We had a one way flight into Bangkok as we are going travelling.

Arrived from the UK via India. No onward/return air ticket. We were asked by the IO how long we were planning to stay and when/where/how we were leaving.

We have been to Thailand twice this year already but short stays within the 60 day visa exempt period. No questions asked about number of times visiting.

We do not plan to stay longer than our visa exempt 60 days this time either but our plans are flexible. I purchased bus tickets to Vientiane and booked a refundable hotel there for two reasons:-

1. In case we needed proof we would be leaving Thailand (within the visa exempt period); and

2. In case our airline questioned us having a one way flight (Air India did question this at the boarding gate in London). They do not want to be responsible for paying in case we are deported.

The IO did not ask to see any proof of the onward travel out of Thailand. But for the sake of £7 for two of us, this was worth it for peace of mind!

There were other nationalities being carefully scrutinised by the IO who were in front of us in the queue.

Thanks for all the advice on the posts in this group. They have been very informative and helpful.