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

Return flights

23 Oct - 30 Oct	ANA
22 Oct - 31 Oct	ANA
15 Oct - 20 Oct	ANA
09 Oct - 20 Oct	ANA
13 Oct - 30 Nov	ANA
07 Oct - 19 Oct	ANA
23 Oct - 28 Oct	ANA
09 Oct - 18 Oct	ANA
27 Oct - 31 Oct	ANA
09 Oct - 21 Oct	ANA
28 Oct - 04 Nov	ANA
15 Oct - 22 Oct	ANA
19 Oct - 02 Nov	ANA
14 Oct - 08 Nov	ANA
01 Oct - 01 Nov	ANA
25 Oct - 01 Nov	Japan Airlines
19 Oct - 15 Nov	ANA

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

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 October from $883

Return flights