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

Return flights

01 Dec - 08 Dec	Delta	direct
03 Dec - 11 Dec	Delta	direct
04 Dec - 06 Dec	Delta	direct
11 Dec - 23 Dec	ANA
11 Dec - 20 Dec	ANA
09 Dec - 12 Jan	ANA
12 Dec - 22 Dec	Delta	direct
11 Dec - 23 Dec	Delta	direct
11 Dec - 20 Dec	Delta	direct
08 Dec - 09 Jan	Asiana Airlines
14 Dec - 17 Jan	WestJet
14 Dec - 17 Jan	Delta	direct
09 Dec - 12 Jan	STARLUX Airlines	direct
09 Dec - 30 Dec	Korean Air
09 Dec - 30 Dec	Delta	direct
08 Dec - 09 Jan	STARLUX Airlines	direct
22 Dec - 18 Jan	Delta	direct
22 Dec - 14 Jan	Delta	direct
21 Dec - 14 Jan	Delta	direct
17 Dec - 18 Jan	Delta	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.

Book a cheap hotel in Taipei

Cheap car rent in Taipei

Cheapest return flights from Seattle to Taipei in December from 582€

Return flights