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

Return flights

29 Sep - 26 Oct	Spirit Airlines
29 Sep - 25 Oct	Spirit Airlines
30 Sep - 14 Oct	Ethiopian Airlines
28 Sep - 26 Oct	Philippine Airlines
29 Sep - 21 Oct	Frontier Airlines
20 Sep - 17 Oct	Air Canada
26 Sep - 20 Oct	Spirit Airlines
22 Sep - 07 Oct	Spirit Airlines
28 Sep - 30 Sep	Air Canada
16 Sep - 30 Sep	Air Canada
15 Sep - 22 Sep	Air Canada
15 Sep - 05 Oct	Air Canada
25 Sep - 06 Oct	Air Canada
17 Sep - 22 Sep	Air Canada
17 Sep - 19 Sep	Air Canada
17 Sep - 24 Sep	Air Canada
18 Sep - 23 Sep	Air Canada
17 Sep - 23 Sep	Air Canada
18 Sep - 25 Sep	Air Canada
20 Sep - 25 Sep	Spirit Airlines

Also check the deals for one-way flights from New York 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 New York to Seoul in September from 737€

Return flights