AirHint found the following cheapest return flights from Riyadh (RUH) to Bangkok (DMK) in September 2025 (see full year).

Return flights

23 Sep - 06 Oct	Gulf Air
29 Sep - 03 Oct	Etihad Airways
23 Sep - 03 Oct	Air India
20 Sep - 02 Oct	Flynas
24 Sep - 30 Sep	Gulf Air
29 Sep - 30 Sep	Gulf Air
20 Sep - 30 Sep	Gulf Air
23 Sep - 30 Sep	Gulf Air
22 Sep - 03 Oct	Gulf Air
24 Sep - 03 Oct	Gulf Air
21 Sep - 03 Oct	Gulf Air
25 Sep - 01 Oct	Air India
25 Sep - 02 Oct	Air India
29 Sep - 10 Oct	Etihad Airways
20 Sep - 23 Sep	SalamAir
20 Sep - 25 Sep	SalamAir
23 Sep - 25 Sep	Air India
20 Sep - 27 Sep	IndiGo
22 Sep - 25 Sep	Flynas
23 Sep - 27 Sep	Air India

Also check the deals for one-way flights from Riyadh to Bangkok 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 Riyadh to Bangkok in September from $399

Return flights