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

Return flights

01 May - 06 May	United
01 May - 03 May	United
01 May - 10 May	United
07 May - 17 May	United
09 May - 15 May	United
27 May - 07 Jun	Delta
21 May - 31 May	Delta
25 May - 26 Jun	Delta
06 May - 13 May	Delta
14 May - 25 May	Delta
02 May - 07 May	Air Canada
02 May - 16 May	Air Canada
27 May - 07 Jun	Korean Air	direct

Also check the deals for one-way flights from Seoul to Seattle in May.

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.

Book a cheap hotel in Seattle

Cheap car rent in Seattle

Cheapest return flights from Seoul to Seattle in May from $620

Return flights