Cheapest one-way flights from Washington to Seoul in September from $452

AirHint found the following cheapest one-way flights from Washington (IAD) to Seoul (ICN) in September 2025 (see full year).

One-Way flights

15 Sep WestJet
10 Sep Frontier Airlines
22 Sep WestJet
24 Sep Frontier Airlines
25 Sep Frontier Airlines
12 Sep Frontier Airlines
04 Sep Frontier Airlines
06 Sep Frontier Airlines
16 Sep Alaska Airlines
09 Sep Turkish Airlines

Also check the deals for return flights from Washington to Seoul in September.

Skyscanner

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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