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

Return flights

24 Mar - 25 Apr	EVA Air
04 Mar - 16 Mar	Japan Airlines
11 Mar - 17 Mar	Japan Airlines
24 Mar - 18 Apr	EVA Air
06 Mar - 13 Mar	EVA Air
17 Mar - 24 Mar	Japan Airlines
23 Mar - 26 Mar	STARLUX Airlines
03 Mar - 17 Mar	ANA
16 Mar - 27 Mar	Japan Airlines
22 Mar - 14 Apr	Japan Airlines
07 Mar - 13 Mar	ANA
18 Mar - 22 Mar	China Airlines
26 Mar - 29 Mar	Japan Airlines
18 Mar - 11 Apr	Japan Airlines
26 Mar - 08 Apr	Japan Airlines
16 Mar - 07 Apr	ANA

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 $908

Return flights