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

Return flights

21 Oct - 28 Oct	Hainan Airlines
15 Oct - 22 Oct	Alaska Airlines
12 Oct - 19 Oct	Philippine Airlines
13 Oct - 20 Oct	Alaska Airlines
23 Oct - 01 Nov	Hainan Airlines
19 Oct - 08 Nov	Korean Air
20 Oct - 30 Oct	Asiana Airlines
09 Oct - 16 Oct	Asiana Airlines
12 Oct - 19 Oct	Delta	direct
15 Oct - 22 Oct	Delta	direct
19 Oct - 08 Nov	Delta	direct
21 Oct - 28 Oct	Delta	direct
05 Oct - 29 Oct	Delta	direct
03 Oct - 01 Nov	Delta	direct

Also check the deals for one-way flights from Seattle to Shanghai 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 Seattle to Shanghai in October from 685€

Return flights