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

Return flights

07 Dec - 25 Dec	ANA
07 Dec - 25 Dec	Delta	direct
10 Dec - 07 Jan	ANA
17 Dec - 30 Dec	Hawaiian Airlines
19 Dec - 27 Dec	Alaska Airlines
12 Dec - 11 Jan	China Airlines	direct
13 Dec - 09 Jan	Delta	direct
17 Dec - 30 Dec	STARLUX Airlines	direct
13 Dec - 10 Jan	STARLUX Airlines	direct
20 Dec - 26 Dec	STARLUX Airlines	direct
12 Dec - 01 Jan	United
19 Dec - 27 Dec	STARLUX Airlines	direct
10 Dec - 07 Jan	STARLUX Airlines	direct
12 Dec - 01 Jan	China Airlines	direct
21 Dec - 03 Jan	STARLUX Airlines	direct
20 Dec - 03 Jan	STARLUX Airlines	direct
20 Dec - 02 Jan	STARLUX Airlines	direct

Also check the deals for one-way flights from Seattle to Taipei 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 Taipei in December from 635€

Return flights