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

Return flights

27 Aug - 11 Sep	WestJet
20 Aug - 04 Sep	Cathay Pacific
28 Aug - 14 Sep	Cathay Pacific
25 Aug - 29 Sep	Cathay Pacific
30 Aug - 14 Sep	Cathay Pacific
24 Aug - 02 Sep	Air Canada
18 Aug - 02 Sep	WestJet
21 Aug - 02 Sep	WestJet
11 Aug - 27 Aug	Air Canada
17 Aug - 27 Aug	Air Canada
19 Aug - 26 Aug	Air Canada
20 Aug - 27 Aug	Air Canada
24 Aug - 31 Aug	Air Canada
04 Aug - 11 Aug	Air Canada
05 Aug - 12 Aug	Air Canada
07 Aug - 14 Aug	Air Canada
11 Aug - 18 Aug	Air Canada
12 Aug - 19 Aug	Air Canada
25 Aug - 01 Sep	Cathay Pacific
29 Aug - 02 Sep	Cathay Pacific

Also check the deals for one-way flights from Boston to Seoul in August.

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 August from $866

Return flights