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

Return flights

07 Sep - 22 Sep	Air Canada
04 Sep - 17 Sep	Air Canada
13 Sep - 28 Sep	Air Canada
01 Sep - 12 Sep	Air Canada
01 Sep - 13 Sep	Air Canada
25 Sep - 30 Sep	Air Canada
06 Sep - 19 Sep	Air Canada
06 Sep - 21 Sep	Air Canada
05 Sep - 21 Sep	Air Canada
06 Sep - 22 Sep	Air Canada
29 Sep - 28 Oct	Air Canada
29 Sep - 30 Oct	Air Canada
22 Sep - 02 Oct	WestJet
29 Sep - 06 Oct	Air Canada
29 Sep - 28 Oct	Delta	direct
29 Sep - 30 Oct	Delta	direct
22 Sep - 02 Oct	Korean Air	direct
24 Sep - 01 Oct	Air Canada

Also check the deals for one-way flights from Boston 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 Boston to Seoul in September from 732€

Return flights