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

Return flights

11 Sep - 18 Sep	Hawaiian Airlines
15 Sep - 24 Sep	United
04 Sep - 17 Sep	United
16 Sep - 24 Sep	United
02 Sep - 22 Sep	United
05 Sep - 20 Sep	United
03 Sep - 19 Sep	United
02 Sep - 15 Sep	United
02 Sep - 17 Sep	United
09 Sep - 22 Sep	United
28 Sep - 15 Oct	United
02 Sep - 30 Oct	United
16 Sep - 04 Oct	United
14 Sep - 02 Oct	United
14 Sep - 03 Oct	United

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 $873

Return flights