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

Return flights

16 Sep - 23 Sep	Air Canada
22 Sep - 29 Sep	Air Canada
23 Sep - 29 Sep	Air Canada
20 Sep - 02 Oct	Air Canada
20 Sep - 26 Sep	Air Canada
25 Sep - 29 Sep	Air Canada
10 Sep - 17 Sep	Air Canada
25 Sep - 27 Sep	Air Canada
12 Sep - 19 Sep	Air Canada
08 Sep - 11 Sep	Air Canada
09 Sep - 16 Sep	Air Canada
30 Sep - 09 Oct	Air Canada
29 Sep - 09 Oct	Air Canada
28 Sep - 05 Oct	WestJet
29 Sep - 12 Oct	Emirates

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 712€

Return flights