Will I have problems at the airport for overstaying my visa in Thailand by 3 days with a re-entry visa and a flight ticket?

If you have overstayed your visa in Thailand by 3 days with a multiple re-entry visa, you can expect to pay a fine of 500 THB per day at the airport. Having a flight ticket back home is generally helpful, as you can show proof of your departure. Ensure you arrive early to address any immigration concerns, and remember to cancel your work permit if applicable.