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

Return flights

22 Apr - 13 May	Turkish Airlines
28 Apr - 08 May	Turkish Airlines
07 Apr - 17 Apr	Turkish Airlines
07 Apr - 16 Apr	Air Canada
03 Apr - 25 Apr	Turkish Airlines
23 Apr - 07 May	Turkish Airlines
22 Apr - 13 May	Delta	direct
07 Apr - 16 Apr	Delta	direct
23 Apr - 07 May	Delta	direct
07 Apr - 17 Apr	Delta	direct
03 Apr - 25 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 $1076

Return flights