AirHint found the following cheapest one-way flights from Washington (IAD) to Seoul (ICN) in September 2026 (see full year).
One-Way flights
| 01 Sep | Alaska Airlines | ||
| 27 Sep | EVA Air | ||
| 28 Sep | Air Premia | direct | |
| 27 Sep | Air Premia | direct | |
| 25 Sep | Air Premia | direct | |
| 30 Sep | Air Premia | direct | |
| 01 Sep | Korean Air | direct |
Also check the deals for return flights from Washington to Seoul in September.
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