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

Return flights

29 Dec - 26 Jan	ANA
29 Dec - 14 Jan	Korean Air
29 Dec - 26 Jan	Delta	direct
29 Dec - 14 Jan	Delta	direct
23 Dec - 30 Dec	Air Canada
16 Dec - 11 Jan	Air Canada
21 Dec - 28 Dec	Air Canada
08 Dec - 08 Jan	Delta	direct
12 Dec - 19 Dec	ANA
21 Dec - 25 Dec	Alaska Airlines
16 Dec - 03 Jan	Alaska Airlines
11 Dec - 01 Jan	Alaska Airlines
12 Dec - 02 Jan	Hawaiian Airlines
11 Dec - 01 Jan	Delta	direct
21 Dec - 28 Dec	Delta	direct

Also check the deals for one-way flights from Seattle to Shanghai 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 Seattle to Shanghai in December from 589€

Return flights