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

Return flights

25 Sep - 24 Oct	Hawaiian Airlines
29 Sep - 08 Oct	Hawaiian Airlines
29 Sep - 20 Oct	Hawaiian Airlines
25 Sep - 25 Oct	Hawaiian Airlines
27 Sep - 25 Oct	Hawaiian Airlines
23 Sep - 24 Oct	Hawaiian Airlines
19 Sep - 13 Oct	Hawaiian Airlines
24 Sep - 24 Oct	Hawaiian Airlines
19 Sep - 11 Oct	Hawaiian Airlines
28 Sep - 25 Oct	Viva
23 Sep - 30 Sep	Hawaiian Airlines
23 Sep - 29 Sep	Hawaiian Airlines
24 Sep - 25 Sep	Aeromexico
19 Sep - 26 Sep	Air Canada

Also check the deals for one-way flights from Monterrey 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 Monterrey to Seoul in September from $946

Return flights