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

Return flights

29 Dec - 16 Jan	United	direct
30 Dec - 20 Jan	ANA	direct
30 Dec - 13 Jan	United
31 Dec - 07 Jan	Delta	direct
26 Dec - 11 Jan	Delta	direct
26 Dec - 09 Jan	Delta	direct
27 Dec - 31 Dec	Delta	direct
25 Dec - 28 Dec	Delta	direct
26 Dec - 31 Dec	Delta	direct
30 Dec - 06 Jan	ANA
29 Dec - 06 Jan	ANA
27 Dec - 01 Jan	Delta
26 Dec - 01 Jan	Delta
24 Dec - 31 Dec	Delta
16 Dec - 27 Dec	Delta	direct
16 Dec - 23 Dec	Delta	direct
18 Dec - 28 Dec	Delta	direct
23 Dec - 28 Dec	Delta
18 Dec - 24 Dec	Delta	direct
17 Dec - 31 Dec	Hawaiian Airlines

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 $661

Return flights