AirHint found the following cheapest return flights from Los Angeles (LAX) to Chiang Mai (CNX) in September 2025 (see full year).

Return flights

21 Sep - 05 Oct	Korean Air
20 Sep - 27 Sep	Korean Air
29 Sep - 02 Oct	Asiana Airlines
20 Sep - 31 Oct	Air Premia

Also check the deals for one-way flights from Los Angeles to Chiang Mai in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Los Angeles to Chiang Mai in September from $707

Return flights