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

Return flights

20 Mar - 28 Mar	Air Canada
17 Mar - 24 Mar	Air Canada
12 Mar - 23 Mar	Air Canada
02 Mar - 11 Mar	Air Canada
18 Mar - 22 Mar	Air Canada
01 Mar - 02 Mar	Air Canada
02 Mar - 03 Mar	Air Canada
25 Mar - 28 Mar	Air Canada
15 Mar - 21 Mar	Air Canada
30 Mar - 06 Apr	Air Canada
19 Mar - 29 Mar	Air Canada
30 Mar - 09 Apr	Air Canada
16 Mar - 10 Apr	Air Canada
25 Mar - 03 Apr	Air Canada
29 Mar - 04 Apr	Air Canada
29 Mar - 05 Apr	Air Canada
25 Mar - 06 Apr	Air Canada
29 Mar - 07 Apr	Air Canada
30 Mar - 08 Apr	Air Canada
31 Mar - 08 Apr	Air Canada

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

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 March from 479€

Return flights