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

Return flights

25 Sep - 30 Sep	Thai VietJet Air
26 Sep - 29 Sep	Thai VietJet Air
25 Sep - 27 Sep	Thai AirAsia
25 Sep - 29 Sep	Thai AirAsia
25 Sep - 07 Oct	Thai AirAsia
25 Sep - 04 Oct	Thai AirAsia
26 Sep - 27 Sep	Thai AirAsia
25 Sep - 02 Oct	Thai VietJet Air
25 Sep - 05 Oct	Thai AirAsia
25 Sep - 11 Oct	Thai AirAsia
30 Sep - 07 Oct	Thai AirAsia
30 Sep - 04 Oct	Thai AirAsia
30 Sep - 05 Oct	Thai AirAsia
26 Sep - 07 Oct	Thai AirAsia
30 Sep - 11 Oct	Thai AirAsia
26 Sep - 30 Sep	Thai AirAsia
29 Sep - 30 Sep	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 204€

Return flights