AirHint found the following cheapest return flights from Seattle (SEA) to Tokyo (HND) in December 2025 (see full year).

Return flights

02 Dec - 16 Dec	Asiana Airlines
08 Dec - 16 Jan	Asiana Airlines
08 Dec - 16 Dec	Asiana Airlines
08 Dec - 17 Dec	Asiana Airlines
01 Dec - 10 Dec	Asiana Airlines
09 Dec - 18 Dec	United	direct
05 Dec - 10 Dec	Asiana Airlines
10 Dec - 18 Dec	Delta	direct
02 Dec - 12 Dec	Asiana Airlines
05 Dec - 12 Dec	Asiana Airlines
08 Dec - 16 Jan	Delta	direct
10 Dec - 24 Dec	Japan Airlines
29 Dec - 13 Jan	ANA	direct
15 Dec - 17 Jan	Delta	direct
25 Dec - 07 Jan	United	direct
25 Dec - 08 Jan	ANA	direct
26 Dec - 11 Jan	ANA
27 Dec - 10 Jan	ANA
26 Dec - 10 Jan	United	direct
27 Dec - 10 Jan	United	direct

Also check the deals for one-way flights from Seattle to Tokyo in December.

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 Tokyo in December from $594

Return flights