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

Return flights

26 Dec - 13 Jan	Air Canada
06 Dec - 20 Dec	Air Canada
08 Dec - 15 Dec	Alaska Airlines
05 Dec - 13 Dec	Hawaiian Airlines
05 Dec - 14 Dec	Alaska Airlines
29 Dec - 14 Jan	Air Canada
30 Dec - 13 Jan	Air Canada
01 Dec - 10 Dec	Turkish Airlines
01 Dec - 19 Dec	Turkish Airlines
10 Dec - 24 Dec	Air Canada
05 Dec - 20 Jan	Air Canada
30 Dec - 17 Jan	Air Canada
05 Dec - 27 Jan	Air Canada
01 Dec - 13 Dec	Air Canada
06 Dec - 18 Jan	Air Canada
05 Dec - 31 Jan	Air Canada
05 Dec - 31 Jan	Air Premia	direct
06 Dec - 13 Dec	Alaska Airlines
05 Dec - 13 Dec	Air Premia	direct
28 Dec - 10 Jan	Air Canada

Also check the deals for one-way flights from Newark 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 Newark to Seoul in December from $887

Return flights