AirHint found the following cheapest return flights from Houston (IAH) to Bangkok (BKK) in September 2025 (see full year).

Return flights

02 Sep - 05 Sep	Spirit Airlines
02 Sep - 08 Sep	Spirit Airlines
03 Sep - 17 Sep	Spirit Airlines
16 Sep - 21 Sep	Delta
15 Sep - 30 Sep	Delta
01 Sep - 15 Sep	Delta
03 Sep - 16 Sep	Spirit Airlines
02 Sep - 31 Oct	Spirit Airlines
05 Sep - 26 Sep	Spirit Airlines
29 Sep - 16 Oct	Spirit Airlines
18 Sep - 22 Sep	Spirit Airlines
29 Sep - 01 Oct	Spirit Airlines
03 Sep - 13 Sep	United
29 Sep - 13 Oct	ANA

Also check the deals for one-way flights from Houston 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 Houston to Bangkok in September from 722€

Return flights