Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Chiang Mai to Strasbourg as you normally would.
Related info for your journey
Useful info, stats and facts about Chiang Mai to Strasbourg flights.
Chiang Mai Airport is CNX and Strasbourg Entzheim Airport is SXB. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service.