AirHint found the following cheapest return flights from Seattle (SEA) to Seoul (GMP) in September 2026 (see full year).
Return flights
| 21 Sep - 06 Oct | Japan Airlines | ||
| 15 Sep - 29 Sep | Japan Airlines | ||
| 02 Sep - 12 Sep | Japan Airlines | ||
| 14 Sep - 28 Sep | Japan Airlines | ||
| 07 Sep - 21 Sep | China Airlines | ||
| 01 Sep - 17 Sep | Japan Airlines |
Also check the deals for one-way flights from Seattle to Seoul in September.
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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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