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

Return flights

01 Dec - 14 Dec	Asiana Airlines
01 Dec - 13 Dec	Asiana Airlines
08 Dec - 22 Dec	Asiana Airlines
07 Dec - 13 Dec	Asiana Airlines
01 Dec - 17 Dec	United	direct
01 Dec - 13 Dec	United	direct
01 Dec - 14 Dec	United	direct
08 Dec - 22 Dec	United	direct
30 Dec - 13 Jan	Asiana Airlines
05 Dec - 11 Dec	Asiana Airlines
05 Dec - 07 Dec	Asiana Airlines
30 Dec - 13 Jan	United	direct
28 Dec - 09 Jan	Asiana Airlines
26 Dec - 09 Jan	United
24 Dec - 18 Jan	Delta
28 Dec - 09 Jan	ANA	direct
26 Dec - 09 Jan	ANA	direct
24 Dec - 07 Jan	United
25 Dec - 01 Jan	United
25 Dec - 05 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 611€

Return flights