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

Return flights

08 Dec - 19 Dec	Air Canada
02 Dec - 16 Dec	Air Canada
02 Dec - 09 Dec	Japan Airlines	direct
04 Dec - 11 Dec	Japan Airlines	direct
03 Dec - 10 Dec	Japan Airlines
05 Dec - 12 Dec	Japan Airlines
07 Dec - 14 Dec	Japan Airlines
14 Dec - 24 Dec	Alaska Airlines
09 Dec - 16 Dec	Japan Airlines
03 Dec - 07 Jan	Air Canada
16 Dec - 24 Dec	WestJet
16 Dec - 13 Jan	WestJet
10 Dec - 13 Jan	Air Canada
26 Dec - 09 Jan	Hawaiian Airlines	direct
16 Dec - 06 Jan	WestJet
25 Dec - 05 Jan	WestJet
11 Dec - 09 Jan	United
17 Dec - 04 Jan	Air Canada
21 Dec - 08 Jan	WestJet
26 Dec - 03 Jan	WestJet

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 $676

Return flights