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

Return flights

27 Dec - 31 Dec	Delta	direct
31 Dec - 07 Jan	Delta	direct
27 Dec - 16 Jan	Delta	direct
28 Dec - 16 Jan	Delta	direct
30 Dec - 06 Jan	Philippine Airlines
27 Dec - 06 Jan	United
28 Dec - 06 Jan	United
29 Dec - 06 Jan	United
29 Dec - 06 Jan	EVA Air	direct
30 Dec - 06 Jan	EVA Air	direct
27 Dec - 06 Jan	EVA Air	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 853€

Return flights