How do I confirm current details for visas, immigration and long-stay planning?

Visa and entry conditions depend on nationality and purpose and can change. Use Thai government or immigration information and avoid treating social-media advice as legal authority. Use the operator, Thai government, Tourism Authority or venue’s current channel close to the date. Cross-check the exact terminal, route, opening day, fee or rule rather than relying on a cached snippet. Immigration note: Entry and extension rules depend on nationality and purpose and can change. Check current Thai government or immigration requirements before relying on an older answer.