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

Return flights

08 Dec - 17 Dec	Asiana Airlines
31 Dec - 30 Jan	Air Canada
08 Dec - 15 Dec	Air Canada
07 Dec - 27 Dec	Air Canada
10 Dec - 24 Dec	Air Canada
31 Dec - 30 Jan	Japan Airlines	direct
11 Dec - 23 Dec	Air Canada
13 Dec - 20 Dec	Air Canada
12 Dec - 26 Dec	Air Canada
14 Dec - 24 Dec	Air Canada
22 Dec - 27 Dec	Air Canada
11 Dec - 24 Dec	Air Canada
23 Dec - 13 Jan	Air Canada
14 Dec - 15 Jan	Air Canada
30 Dec - 06 Jan	Asiana Airlines
21 Dec - 09 Jan	Air Canada
30 Dec - 07 Jan	Asiana Airlines
05 Dec - 07 Jan	United
25 Dec - 04 Jan	Korean Air
24 Dec - 07 Jan	Air Canada

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 536€

Return flights