Will changing my flight number affect my Thai visa application?

If your flight number changes due to a cancellation but you are still traveling to Thailand on the same day, it should not impact your Thai visa application. The arrival flight number is not considered essential for the visa, while the flight number related to the ThailandPass is more important. You have a window of up to 72 hours to enter Thailand based on your original flight schedule, and you should ensure that your pre-flight PCR test results are still valid. Update any necessary accommodations or transfers accordingly.