AirHint found the following cheapest one-way flights from Washington (DCA) to Seoul (ICN) in December 2025 (see full year).
One-Way flights
| 25 Dec | Frontier Airlines | ||
| 13 Dec | Frontier Airlines | ||
| 28 Dec | Air Canada | ||
| 29 Dec | Air Canada | ||
| 14 Dec | Frontier Airlines | ||
| 23 Dec | Air Canada | ||
| 18 Dec | WestJet |
Also check the deals for return flights from Washington to Seoul in December.
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