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

Return flights

12 Sep - 18 Sep	Asiana Airlines
10 Sep - 17 Sep	Asiana Airlines
15 Sep - 22 Sep	Asiana Airlines
12 Sep - 18 Sep	Delta	direct
10 Sep - 17 Sep	Delta	direct
15 Sep - 22 Sep	Delta	direct
11 Sep - 26 Sep	Delta	direct
12 Sep - 20 Sep	Delta	direct
05 Sep - 19 Sep	Delta	direct
05 Sep - 18 Sep	Delta
21 Sep - 21 Oct	Delta	direct
24 Sep - 06 Oct	Delta	direct
24 Sep - 01 Oct	Delta	direct
23 Sep - 07 Oct	Delta
24 Sep - 07 Oct	Air Canada
24 Sep - 07 Oct	Delta	direct
26 Sep - 10 Oct	Delta	direct

Also check the deals for one-way flights from Shanghai 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 Shanghai to Seattle in September from $726

Return flights