AirHint found the following cheapest return flights from Chiang Rai (CEI) to Singapore (SIN) in September 2025 (see full year).

Return flights

29 Sep - 06 Oct	Nok Air
05 Sep - 25 Sep	Thai AirAsia
06 Sep - 25 Sep	Thai AirAsia
03 Sep - 08 Sep	Thai AirAsia
05 Sep - 08 Sep	Thai AirAsia
09 Sep - 29 Sep	Thai AirAsia
24 Sep - 29 Sep	Thai AirAsia
28 Sep - 29 Sep	Thai AirAsia
09 Sep - 25 Sep	Thai AirAsia
06 Sep - 08 Sep	Thai AirAsia
09 Sep - 28 Sep	Thai AirAsia
24 Sep - 05 Oct	Thai AirAsia
28 Sep - 05 Oct	Thai AirAsia
24 Sep - 07 Oct	Thai AirAsia
28 Sep - 07 Oct	Thai AirAsia
29 Sep - 05 Oct	Thai AirAsia
29 Sep - 07 Oct	Thai AirAsia
30 Sep - 05 Oct	Thai AirAsia
27 Sep - 05 Oct	Thai AirAsia
30 Sep - 07 Oct	Thai AirAsia

Also check the deals for one-way flights from Chiang Rai to Singapore 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 Chiang Rai to Singapore in September from $207

Return flights