The total flight duration from SFO to Phuket Thailand is 17 hours 12 minutes. Ad Flight To Thailand. Cheap Flights From Sfo To Hnd When To Fly From San Francisco To Tokyo Champion Traveler Searching for flights from San Francisco to Thailand and Thailand to San Francisco is easy. . This assumes an average flight speed for a commercial airliner of 500 mph which is equivalent to 805 kmh or 434 knots. Your exact time may vary depending on wind speeds. Easily cancelchange later if needed. Find and Compare Top Deals on Cheap Flights. This assumes an average flight speed for a commercial airliner of 500 mph which is equivalent to 805 kmh or 434 knots. How long is the flight time to Thailand. Depending on general weather conditions and the route of travel a flight from SFO to BKK can take almost 18 hours to complete. There are currently 20 open flights from San Francisco to Thailand within the next 7 days for les...