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

Return flights

25 Aug - 04 Sep	Viva
22 Aug - 31 Aug	Viva
28 Aug - 07 Sep	Aeromexico
23 Aug - 31 Aug	Aeromexico
29 Aug - 05 Sep	Aeromexico
24 Aug - 30 Aug	Viva
22 Aug - 29 Aug	Aeromexico
22 Aug - 30 Aug	Aeromexico
23 Aug - 30 Aug	Aeromexico
20 Aug - 29 Aug	Viva
19 Aug - 26 Aug	Viva
19 Aug - 29 Aug	Viva
20 Aug - 27 Aug	Viva
29 Aug - 07 Sep	Delta

Also check the deals for one-way flights from Monterrey to Seoul in August.

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 August from 921€

Return flights