Cheapest return flights from Washington to Seoul in September from $983

Best time to book flights for Washington (IAD) to Seoul (ICN) flights at AirHint

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

Return flights

15 Sep - 22 Sep Turkish Airlines
19 Sep - 13 Oct WestJet
10 Sep - 14 Oct Turkish Airlines
01 Sep - 08 Sep Turkish Airlines
26 Sep - 10 Oct WestJet
25 Sep - 29 Sep Turkish Airlines
13 Sep - 27 Sep Alaska Airlines
12 Sep - 27 Sep WestJet
02 Sep - 30 Sep Air India
15 Sep - 22 Sep Delta direct
01 Sep - 02 Sep Alaska Airlines
01 Sep - 08 Sep Korean Air direct
26 Sep - 10 Oct Delta direct
25 Sep - 29 Sep Delta direct

Also check the deals for one-way 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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