AirHint found the following cheapest return flights from Houston (IAH) to Ho Chi Minh City (SGN) in September 2025 (see full year).

Return flights

08 Sep - 17 Sep	Spirit Airlines
22 Sep - 20 Oct	Frontier Airlines
23 Sep - 07 Oct	Spirit Airlines
10 Sep - 22 Sep	Spirit Airlines
23 Sep - 23 Oct	Spirit Airlines
23 Sep - 16 Oct	Spirit Airlines
28 Sep - 13 Oct	Frontier Airlines
07 Sep - 05 Oct	Spirit Airlines
04 Sep - 17 Sep	Frontier Airlines
20 Sep - 06 Oct	Frontier Airlines
17 Sep - 24 Sep	Spirit Airlines
04 Sep - 20 Sep	Spirit Airlines
06 Sep - 13 Sep	Spirit Airlines
01 Sep - 08 Sep	Cathay Pacific
19 Sep - 13 Oct	Spirit Airlines
23 Sep - 24 Sep	EVA Air
05 Sep - 14 Sep	Cathay Pacific
11 Sep - 26 Sep	EVA Air

Also check the deals for one-way flights from Houston to Ho Chi Minh City 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 Ho Chi Minh City in September from $635

Return flights