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

Return flights

26 Dec - 29 Dec	Delta	direct
24 Dec - 29 Dec	Delta	direct
29 Dec - 17 Jan	China Airlines	direct
26 Dec - 19 Jan	Delta	direct
21 Dec - 28 Dec	Delta	direct
18 Dec - 25 Dec	Delta	direct
27 Dec - 16 Jan	Delta	direct
28 Dec - 16 Jan	Delta	direct
26 Dec - 08 Jan	United
26 Dec - 16 Jan	Delta	direct
26 Dec - 08 Jan	China Airlines	direct
24 Dec - 08 Jan	Delta	direct
25 Dec - 08 Jan	United
17 Dec - 18 Jan	Hawaiian Airlines
19 Dec - 31 Dec	Hawaiian Airlines
19 Dec - 31 Dec	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 $859

Return flights