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

Return flights

28 Sep - 11 Oct	WestJet
06 Sep - 19 Sep	WestJet
27 Sep - 11 Oct	WestJet
29 Sep - 12 Oct	WestJet
27 Sep - 10 Oct	WestJet
08 Sep - 15 Sep	WestJet
18 Sep - 24 Sep	Air Canada
16 Sep - 23 Sep	Air Canada
10 Sep - 24 Sep	Air Canada
30 Sep - 09 Oct	Air Canada
24 Sep - 29 Sep	Air Canada
12 Sep - 21 Sep	WestJet
19 Sep - 22 Sep	WestJet
30 Sep - 10 Oct	Air Canada
10 Sep - 14 Sep	Air Canada
12 Sep - 26 Sep	WestJet
30 Sep - 09 Oct	Delta	direct
29 Sep - 12 Oct	Delta	direct
30 Sep - 10 Oct	Delta	direct
27 Sep - 10 Oct	Delta	direct

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 708€

Return flights