AirHint found the following cheapest return flights from Houston (HOU) to Seoul (ICN) in September 2025 (see full year).

Return flights

17 Sep - 01 Oct	Spirit Airlines
08 Sep - 14 Sep	Zipair
09 Sep - 21 Sep	Frontier Airlines
08 Sep - 19 Sep	Zipair
09 Sep - 24 Sep	EVA Air
15 Sep - 24 Sep	EVA Air
08 Sep - 20 Sep	EVA Air
13 Sep - 20 Sep	EVA Air
22 Sep - 30 Sep	EVA Air
08 Sep - 17 Sep	Delta
10 Sep - 19 Sep	Delta
05 Sep - 03 Oct	Delta

Also check the deals for one-way flights from Houston to Seoul 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 Seoul in September from $880

Return flights