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

Return flights

08 Dec - 16 Dec	Air Canada
08 Dec - 17 Dec	Air Canada
07 Dec - 14 Dec	Air Canada
08 Dec - 13 Dec	Air Canada
08 Dec - 15 Dec	Air Canada
07 Dec - 13 Dec	Air Canada
09 Dec - 16 Dec	Air Canada
10 Dec - 17 Dec	Air Canada
29 Dec - 11 Jan	Air Canada
31 Dec - 11 Jan	Air Canada
09 Dec - 22 Dec	Air Canada
13 Dec - 24 Dec	Air Canada
29 Dec - 08 Jan	Alaska Airlines
22 Dec - 18 Jan	Air Canada
26 Dec - 09 Jan	Alaska Airlines
26 Dec - 07 Jan	Alaska Airlines
31 Dec - 11 Jan	Japan Airlines	direct
27 Dec - 05 Jan	Alaska Airlines
26 Dec - 05 Jan	Alaska Airlines
30 Dec - 05 Jan	Alaska 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 525€

Return flights