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

Return flights

26 Dec - 02 Jan	Korean Air
05 Dec - 09 Jan	Delta	direct
05 Dec - 06 Jan	Delta	direct
26 Dec - 02 Jan	Delta	direct
01 Dec - 08 Dec	United
17 Dec - 24 Dec	Delta	direct
01 Dec - 08 Dec	Delta	direct
01 Dec - 12 Jan	Delta	direct
01 Dec - 05 Jan	Delta	direct
19 Dec - 26 Dec	Delta	direct
05 Dec - 26 Dec	Delta	direct
15 Dec - 22 Dec	Air Canada
15 Dec - 22 Dec	Delta	direct
11 Dec - 18 Dec	Delta	direct
14 Dec - 21 Dec	Air Canada
12 Dec - 19 Dec	Air Canada

Also check the deals for one-way flights from Shanghai to Seattle in December.

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 December from $814

Return flights