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

Return flights

08 Dec - 24 Dec	Turkish Airlines
01 Dec - 08 Dec	Turkish Airlines
05 Dec - 08 Dec	Turkish Airlines
01 Dec - 29 Dec	Air Canada
01 Dec - 01 Jan	Turkish Airlines
05 Dec - 19 Jan	Air Canada
09 Dec - 24 Dec	Turkish Airlines
09 Dec - 13 Jan	Cathay Pacific
13 Dec - 20 Dec	Turkish Airlines
08 Dec - 17 Jan	Cathay Pacific
08 Dec - 09 Jan	Cathay Pacific
13 Dec - 31 Dec	Turkish Airlines
29 Dec - 14 Jan	Turkish Airlines
13 Dec - 01 Jan	Turkish Airlines
10 Dec - 19 Jan	Turkish Airlines
29 Dec - 11 Jan	Turkish Airlines
10 Dec - 13 Jan	Singapore Airlines
07 Dec - 28 Dec	Air France
01 Dec - 08 Dec	Delta	direct
01 Dec - 10 Dec	Delta	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 784€

Return flights