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

Return flights

04 Sep - 11 Sep	Delta
14 Sep - 20 Sep	Delta
17 Sep - 24 Sep	Delta
09 Sep - 16 Sep	United
14 Sep - 28 Sep	United
13 Sep - 20 Sep	United
09 Sep - 29 Sep	United
09 Sep - 27 Sep	Air Canada
09 Sep - 21 Sep	Air Canada
17 Sep - 11 Oct	Air Canada
09 Sep - 08 Oct	Frontier Airlines
30 Sep - 21 Oct	Hawaiian Airlines
16 Sep - 23 Sep	Air Canada
24 Sep - 08 Oct	Air Canada
16 Sep - 08 Oct	Air Canada
13 Sep - 07 Oct	Frontier Airlines
23 Sep - 07 Oct	Hawaiian Airlines
28 Sep - 05 Oct	Hawaiian Airlines
19 Sep - 03 Oct	United
13 Sep - 03 Oct	United

Also check the deals for one-way flights from Cleveland 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 Cleveland to Seoul in September from 761€

Return flights