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

Return flights

02 Apr - 06 Apr	United
23 Apr - 26 Apr	United
01 Apr - 08 Apr	United
02 Apr - 23 Apr	United
23 Apr - 02 May	United
01 Apr - 30 Apr	United
23 Apr - 25 Apr	United
06 Apr - 14 Apr	American Airlines
13 Apr - 20 Apr	American Airlines
17 Apr - 29 Apr	American Airlines
03 Apr - 10 Apr	American Airlines
27 Apr - 01 May	United
29 Apr - 05 May	United
28 Apr - 05 May	United
20 Apr - 01 May	United
30 Apr - 07 May	United
29 Apr - 06 May	United
30 Apr - 04 May	United
24 Apr - 06 May	United
24 Apr - 02 May	United

Also check the deals for one-way flights from Seoul to Seattle 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 Seoul to Seattle in April from $560

Return flights