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

Return flights

04 Dec - 09 Dec	Air Canada
01 Dec - 15 Dec	Turkish Airlines
03 Dec - 17 Dec	American Airlines
05 Dec - 12 Dec	jetBlue
02 Dec - 06 Dec	Turkish Airlines
10 Dec - 15 Dec	Icelandair
09 Dec - 13 Jan	Alaska Airlines
29 Dec - 15 Jan	Frontier Airlines
12 Dec - 29 Jan	Icelandair
25 Dec - 14 Jan	Frontier Airlines
30 Dec - 09 Jan	Frontier Airlines
30 Dec - 14 Jan	Turkish Airlines
29 Dec - 09 Jan	Turkish Airlines
09 Dec - 16 Dec	Turkish Airlines
29 Dec - 13 Jan	Turkish Airlines
26 Dec - 15 Jan	Frontier Airlines
28 Dec - 09 Jan	Frontier Airlines
10 Dec - 17 Dec	Turkish Airlines
12 Dec - 28 Dec	Icelandair
05 Dec - 08 Dec	Cathay Pacific

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 $872

Return flights