AirHint found the following cheapest return flights from Taipei (TPE) to Seattle (SEA) in September 2026 (see full year).

Return flights

24 Sep - 03 Oct	Cathay Pacific
10 Sep - 23 Sep	Cathay Pacific
17 Sep - 26 Sep	Cathay Pacific
09 Sep - 16 Sep	Cathay Pacific
06 Sep - 14 Sep	Cathay Pacific
01 Sep - 09 Sep	Cathay Pacific
03 Sep - 14 Sep	Cathay Pacific
06 Sep - 30 Sep	Cathay Pacific
03 Sep - 12 Sep	Cathay Pacific
03 Sep - 27 Oct	Cathay Pacific
07 Sep - 14 Sep	Delta	direct
24 Sep - 02 Oct	Korean Air
07 Sep - 18 Sep	Delta	direct
24 Sep - 04 Oct	Delta	direct
03 Sep - 27 Oct	Delta	direct
25 Sep - 04 Oct	Delta	direct
24 Sep - 02 Oct	Delta	direct
26 Sep - 11 Oct	United
24 Sep - 03 Oct	EVA Air	direct

Also check the deals for one-way flights from Taipei to Seattle in September.

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 Taipei to Seattle in September from 511€

Return flights