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

Return flights

13 Sep - 07 Oct	WestJet
12 Sep - 06 Oct	Spirit Airlines
17 Sep - 30 Sep	Spirit Airlines
12 Sep - 16 Sep	Spirit Airlines
13 Sep - 20 Sep	WestJet
12 Sep - 07 Oct	Spirit Airlines
15 Sep - 30 Sep	Spirit Airlines
12 Sep - 05 Oct	Spirit Airlines
22 Sep - 30 Sep	Zipair
06 Sep - 14 Sep	Zipair
17 Sep - 20 Sep	Spirit Airlines
08 Sep - 19 Sep	Zipair
09 Sep - 24 Sep	Frontier Airlines
05 Sep - 12 Sep	Frontier Airlines
12 Sep - 04 Oct	Spirit Airlines
03 Sep - 29 Oct	EVA Air
05 Sep - 03 Oct	United

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.

Book a cheap hotel in Seoul

Cheap car rent in Seoul

Cheapest return flights from Houston to Seoul in September from $830

Return flights