Cheap Thai Airways International flights San Francisco (SFO) to Chiang Rai (CEI)

Use the “Price (lowest to highest)” filter on Expedia to search for cheap Thai Airways International return flights from SFO to CEI. Affordable one-way tickets are also available.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Look for return or one-way flights to Chiang Rai in August or May. You could find an affordable fare with Thai Airways International during these off-peak times.

To grab cheap flights from SFO to CEI with Thai Airways International, start your search about one month before your planned departure. You can save 17% when you lock in your international tickets 18 to 29 days ahead instead of booking four to five months in advance. Another useful tip? Booking on Sunday can lead to average savings of 17% compared to Friday (the most expensive day).**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

To figure out if there’s a direct trip from SFO to CEI with Thai Airways International or other airlines, check the “Nonstop” box when searching for flights.

To find the earliest departure from SFO to CEI with Thai Airways International, sort your results by “Early Morning” and “Morning.” Choosing an early flight generally means you’ll experience fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Thai Airways International flights from San Francisco Intl. Airport (SFO) to Chiang Rai arrive at Chiang Rai Intl. Airport (CEI). This is the main gateway here.

Fly from SFO to CEI with Thai Airways International and you can look forward to a host of benefits starting with top-tier customer service. When you book through Expedia as a Thai Royal Orchid Plus and One Key™ member, you may also earn OneKeyCash™* to redeem on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

In most cases, you can cancel or change your flight, although there may be a charge if you made your booking over 24 hours ago. Need flexible options? Make use of our “No cancel fee” or “Changes included” filter to find flights that won’t charge extra if you need to revise your plans. To update your itinerary, head to “Trips,” select your flight and click on “Manage Booking” for more information.