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

Return flights

28 Dec - 18 Jan	United	direct
02 Dec - 09 Dec	Japan Airlines
03 Dec - 10 Dec	Japan Airlines
10 Dec - 23 Dec	ANA	direct
30 Dec - 09 Jan	United
10 Dec - 19 Dec	ANA	direct
10 Dec - 17 Dec	Delta	direct
09 Dec - 16 Dec	Delta	direct
14 Dec - 23 Dec	United
14 Dec - 24 Dec	United
28 Dec - 11 Jan	ANA	direct
04 Dec - 11 Dec	Japan Airlines
12 Dec - 24 Dec	Air Canada
30 Dec - 09 Jan	Delta	direct
26 Dec - 09 Jan	Asiana Airlines
26 Dec - 09 Jan	Delta	direct
16 Dec - 13 Jan	Delta	direct
10 Dec - 05 Jan	Delta	direct
09 Dec - 05 Jan	Delta	direct
11 Dec - 05 Jan	Delta	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 $842

Return flights