I've booked to go to Thailand July 15th to August 17th (33 Days). At the time I booked, I thought the visa exemption would be 45 days until the end of the year. My flight ticket is for those fixed dates and I wonder if I will have any problem entering and extending when in Thailand because my return flight is over 30 days. I should have looked into the 45 day thing more carefully I know! I guess the safest thying is to get a 60 day e-visa. I'm British.
TLDR : Answer Summary
The individual is concerned about entering Thailand with a return flight scheduled for 33 days after arrival while under the assumption they could benefit from a 45-day visa exemption. Due to the regulations stating a maximum 30-day stay without a visa, they are advised to confirm with their airline about boarding requirements and consider applying for a 60-day tourist visa to avoid complications. Several commenters emphasize checking with the airline regarding proof of onward travel, as different airlines have varying policies.