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

Return flights

08 Dec - 23 Dec	Korean Air
08 Dec - 16 Dec	Korean Air
08 Dec - 24 Dec	Delta	direct
08 Dec - 23 Dec	Delta	direct
02 Dec - 09 Dec	Delta	direct
02 Dec - 22 Dec	Delta	direct
08 Dec - 16 Dec	Delta	direct
01 Dec - 14 Dec	Korean Air
01 Dec - 14 Dec	Delta	direct
08 Dec - 12 Dec	Korean Air
26 Dec - 20 Jan	Delta	direct
26 Dec - 19 Jan	Delta	direct
25 Dec - 19 Jan	Hawaiian Airlines
25 Dec - 19 Jan	Delta	direct
08 Dec - 04 Jan	Air Canada
07 Dec - 04 Jan	Air Canada
09 Dec - 04 Jan	Korean Air
26 Dec - 06 Jan	STARLUX Airlines	direct
22 Dec - 01 Jan	Air Canada
28 Dec - 03 Jan	ANA

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 $662

Return flights