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

Return flights

25 Aug - 08 Sep	Air Canada
28 Aug - 14 Sep	WestJet
11 Aug - 18 Aug	WestJet
17 Aug - 27 Aug	WestJet
13 Aug - 20 Aug	WestJet
11 Aug - 15 Aug	WestJet
10 Aug - 17 Aug	jetBlue
19 Aug - 26 Aug	Air Canada
20 Aug - 27 Aug	Air Canada
24 Aug - 31 Aug	Air Canada
17 Aug - 24 Aug	Air Canada
22 Aug - 29 Aug	Air Canada
25 Aug - 01 Sep	Air Canada
25 Aug - 08 Sep	Delta	direct
28 Aug - 14 Sep	Delta	direct

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 787€

Return flights