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

Return flights

12 Mar - 19 Mar	Korean Air	direct
28 Mar - 15 Apr	Korean Air	direct
17 Mar - 24 Mar	Korean Air	direct
16 Mar - 30 Mar	Delta	direct
05 Mar - 28 Mar	Delta	direct
23 Mar - 31 Mar	Delta	direct
15 Mar - 30 Mar	Delta	direct
27 Mar - 10 Apr	Delta	direct
20 Mar - 04 Apr	Delta	direct
13 Mar - 28 Mar	Delta	direct
11 Mar - 21 Mar	Delta	direct
20 Mar - 28 Mar	Delta
21 Mar - 11 Apr	Delta

Also check the deals for one-way flights from Seattle to Seoul 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 Seattle to Seoul in March from 714€

Return flights