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

One-Way flights

17 Sep	Air Canada
18 Sep	Air Canada
14 Sep	Air Canada
12 Sep	Air Canada
13 Sep	Air Canada
19 Sep	Air Canada
04 Sep	Korean Air	direct
15 Sep	Korean Air	direct
17 Sep	Korean Air	direct
18 Sep	Korean Air	direct

Also check the deals for return 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 one-way flights from Boston to Seoul in September from 469€

One-Way flights