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

Return flights

22 Aug - 12 Sep	WestJet
25 Aug - 08 Sep	Cathay Pacific
13 Aug - 11 Sep	WestJet
13 Aug - 14 Sep	WestJet
13 Aug - 12 Sep	WestJet
29 Aug - 12 Sep	WestJet
23 Aug - 16 Sep	Air Canada
30 Aug - 13 Sep	WestJet
13 Aug - 13 Sep	Porter Airlines (Canada) Ltd
18 Aug - 31 Aug	WestJet
17 Aug - 27 Aug	WestJet
17 Aug - 26 Aug	Air Canada
19 Aug - 26 Aug	Air Canada
20 Aug - 27 Aug	Air Canada
27 Aug - 03 Sep	Air Canada
17 Aug - 29 Aug	Air Canada
24 Aug - 31 Aug	Air Canada
04 Aug - 11 Aug	Air Canada
05 Aug - 12 Aug	Air Canada
06 Aug - 13 Aug	Air Canada

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 813€

Return flights