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

Return flights

26 Sep - 12 Oct	Volaris
18 Sep - 29 Sep	Viva
12 Sep - 21 Sep	Mexicana
17 Sep - 24 Sep	Viva
20 Sep - 28 Sep	Viva
04 Sep - 17 Sep	Aeromexico
17 Sep - 29 Sep	Viva
03 Sep - 17 Sep	Viva
25 Sep - 11 Oct	Viva
10 Sep - 17 Sep	Aeromexico
17 Sep - 28 Sep	Viva
25 Sep - 07 Oct	Viva
08 Sep - 15 Sep	Volaris
26 Sep - 20 Oct	Volaris
03 Sep - 29 Oct	Volaris
30 Sep - 21 Oct	Aeromexico
24 Sep - 07 Oct	Volaris
23 Sep - 17 Oct	Aeromexico
23 Sep - 08 Oct	Aeromexico
16 Sep - 07 Oct	Aeromexico

Also check the deals for one-way flights from Mexico City 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 Mexico City to Seoul in September from 839€

Return flights