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

Return flights

10 Dec - 21 Jan	Cathay Pacific
11 Dec - 21 Jan	Turkish Airlines
10 Dec - 26 Dec	United
15 Dec - 21 Jan	Lufthansa
16 Dec - 23 Dec	Air Canada
15 Dec - 21 Jan	Delta	direct
11 Dec - 21 Jan	Delta	direct
19 Dec - 16 Jan	jetBlue
17 Dec - 03 Jan	KLM
17 Dec - 04 Jan	KLM
18 Dec - 02 Jan	Cathay Pacific
17 Dec - 03 Jan	Korean Air	direct

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

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 December from 1113€

Return flights