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

Return flights

07 Dec - 13 Dec	United
08 Dec - 22 Dec	Delta	direct
07 Dec - 13 Dec	Delta	direct
10 Dec - 17 Dec	Delta	direct
10 Dec - 27 Dec	Delta	direct
11 Dec - 16 Dec	United
11 Dec - 22 Dec	United
11 Dec - 18 Dec	United
08 Dec - 29 Dec	Delta	direct
28 Dec - 16 Jan	Delta
10 Dec - 28 Dec	Delta	direct
25 Dec - 15 Jan	Alaska Airlines
26 Dec - 19 Jan	Delta	direct
25 Dec - 15 Jan	EVA Air	direct
27 Dec - 16 Jan	Delta
26 Dec - 16 Jan	Delta
26 Dec - 08 Jan	Alaska Airlines
17 Dec - 18 Jan	Hawaiian Airlines
11 Dec - 10 Jan	United
08 Dec - 06 Jan	Alaska Airlines

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 552€

Return flights