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

Return flights

31 Aug - 13 Sep	Air Canada
31 Aug - 12 Sep	Air Canada
31 Aug - 14 Sep	Air Canada
31 Aug - 21 Sep	Air Canada
31 Aug - 15 Sep	Air Canada
31 Aug - 20 Sep	Air Canada
31 Aug - 19 Sep	Air Canada
29 Aug - 15 Sep	Cathay Pacific
30 Aug - 09 Sep	WestJet
30 Aug - 12 Sep	WestJet
17 Aug - 27 Aug	Hainan Airlines
20 Aug - 27 Aug	Spirit Airlines
28 Aug - 31 Aug	Hawaiian Airlines
18 Aug - 25 Aug	Frontier Airlines
17 Aug - 31 Aug	Turkish Airlines
17 Aug - 28 Aug	Turkish Airlines
26 Aug - 30 Aug	Air Canada
30 Aug - 31 Aug	Hawaiian Airlines
23 Aug - 30 Aug	Air Canada
17 Aug - 29 Aug	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 741€

Return flights