AirHint found the following cheapest return flights from Washington (IAD) to Seoul (ICN) in April 2026 (see full year).

Return flights

14 Apr - 25 Apr	Etihad Airways
18 Apr - 24 Apr	Turkish Airlines
01 Apr - 29 Apr	Etihad Airways
01 Apr - 10 Apr	Turkish Airlines
23 Apr - 09 May	Turkish Airlines
23 Apr - 23 May	Turkish Airlines
25 Apr - 09 May	Turkish Airlines
01 Apr - 29 Apr	Delta	direct
01 Apr - 20 Apr	Delta	direct
25 Apr - 09 May	Korean Air	direct
01 Apr - 10 Apr	Delta	direct
23 Apr - 09 May	Delta	direct
18 Apr - 24 Apr	Delta	direct

Also check the deals for one-way flights from Washington to Seoul in April.

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 Washington to Seoul in April from $1090

Return flights