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

Return flights

24 Sep - 01 Oct	Air Canada
22 Sep - 29 Sep	Air Canada
23 Sep - 29 Sep	Air Canada
20 Sep - 27 Sep	T'way Air
20 Sep - 21 Sep	Air Canada
23 Sep - 30 Sep	Air Canada
22 Sep - 06 Oct	Air Premia
30 Sep - 05 Oct	HK Express
22 Sep - 12 Oct	EVA Air
27 Sep - 04 Oct	Air Canada
30 Sep - 07 Oct	Air Canada
29 Sep - 13 Oct	Korean Air
26 Sep - 13 Oct	Korean Air
30 Sep - 13 Oct	Korean Air
28 Sep - 13 Oct	Korean Air
22 Sep - 26 Sep	WestJet
25 Sep - 27 Sep	Air Canada
21 Sep - 30 Sep	WestJet

Also check the deals for one-way flights from Seoul to Cancun 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 Seoul to Cancun in September from $854

Return flights