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

Return flights

01 Dec - 08 Dec	Air Premia	direct
30 Dec - 14 Jan	Air Canada
31 Dec - 21 Jan	Air Canada
01 Dec - 11 Dec	Turkish Airlines
05 Dec - 15 Dec	Alaska Airlines
07 Dec - 26 Dec	Turkish Airlines
10 Dec - 19 Dec	Air Canada
10 Dec - 21 Dec	Air Canada
10 Dec - 20 Dec	Air Canada
31 Dec - 18 Jan	Air Canada
29 Dec - 24 Jan	Air Canada
29 Dec - 08 Jan	Air Canada
07 Dec - 26 Dec	Air Premia	direct
07 Dec - 31 Dec	Alaska Airlines
10 Dec - 30 Dec	Alaska Airlines
28 Dec - 11 Jan	Air Canada
10 Dec - 10 Jan	Air Canada
11 Dec - 09 Jan	Ethiopian Airlines
31 Dec - 21 Jan	Air Premia	direct
30 Dec - 14 Jan	Air Premia	direct

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 $925

Return flights