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

Return flights

07 Sep - 13 Sep	Delta	direct
02 Sep - 14 Sep	Delta	direct
03 Sep - 10 Sep	Delta	direct
08 Sep - 08 Sep	United
08 Sep - 25 Sep	Delta	direct
06 Sep - 25 Sep	Delta	direct
08 Sep - 17 Sep	Delta	direct
05 Sep - 09 Sep	Delta	direct
11 Sep - 17 Sep	Delta	direct
12 Sep - 23 Sep	Delta	direct
23 Sep - 22 Oct	Delta	direct
20 Sep - 22 Oct	Delta	direct
20 Sep - 05 Oct	Delta	direct
30 Sep - 08 Oct	Delta	direct
23 Sep - 05 Oct	Delta	direct
02 Sep - 08 Oct	Delta	direct
26 Sep - 06 Oct	Delta	direct
22 Sep - 02 Oct	Delta	direct
27 Sep - 05 Oct	Delta	direct
26 Sep - 13 Oct	Delta	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 548€

Return flights