If my school takes too long and I can't cancel my work permit and visa in time for my flight, will there be a problem for me? Would they stop me from going back to the USA?
TLDR : Answer Summary
You won't be stopped from leaving Thailand if your school takes too long to cancel your work permit and visa. However, you might face issues when trying to return to Thailand for work in the future if you don't cancel your Non-B extension before departing. It's crucial that you take action yourself to manage your work permit and visa cancellation instead of relying solely on your employer.