You can check in with Thai Airways as early as 24 hours before departure using the airline’s online check-in service, which is available through the official Thai Airways website or mobile app. This is the most efficient way to secure your boarding pass and choose your preferred seat without waiting at the airport. Online check-in opens exactly 24 hours before your scheduled flight and closes 1 hour before international departures. Once completed, you can download or email your boarding pass and, if traveling with only carry-on baggage, head straight to airport security. For passengers with checked luggage, you must still arrive early to drop off bags at the airline’s check-in counter before it closes. At the airport, Thai Airways check-in counters typically open 3 hours before international flights and 2 hours before domestic flights, although this may vary slightly depending on the airport and destination. Counters usually close 40 to 60 minutes before departure, so arriving with enough time to complete baggage drop, security screening, and immigration procedures is essential. Thai Airways also offers self-service kiosks at major airports such as Bangkok Suvarnabhumi, allowing passengers to check in, choose a seat, and print boarding passes without assistance. For domestic flights within Thailand, check-in is generally faster, but it is still recommended to arrive early during peak travel seasons. Business class travelers and Royal Orchid Plus members benefit from priority check-in counters, reducing wait times further. Passengers flying on codeshare or connecting flights should double-check with the airline to confirm the earliest available check-in time. For those needing special assistance, traveling with pets, infants, or large groups, airport check-in is required, and arriving early is advised to ensure all services are arranged properly. Boarding gates for Thai Airways usually close 20 minutes before takeoff, and late arrival at the gate may result in denied boarding, regardless of check-in status. To stay informed, passengers can use Thai Airways’ app or website to check real-time flight updates, boarding times, and any schedule changes. The airline advises all travelers to check visa requirements and ensure all documents are ready before reaching the check-in desk. Thai Airways' early check-in options provide flexibility and convenience, especially for international travelers who want to minimize airport stress. By checking in online 24 hours before departure or arriving at the airport 2–3 hours early, you ensure a smoother and more relaxed travel experience. Always verify your flight details, route-specific policies, and baggage rules directly on the airline’s official website for the most accurate and updated information. In short, Thai Airways lets you check in as early as 24 hours before your flight online, and airport counters open 2 to 3 hours before departure. Choosing the best check-in option for your journey helps avoid delays, secure your preferred seat, and travel with peace of mind.