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

Return flights

02 Dec - 23 Dec	ANA
04 Dec - 25 Dec	ANA
04 Dec - 28 Dec	ANA
06 Dec - 25 Dec	Delta	direct
02 Dec - 23 Dec	Delta	direct
04 Dec - 25 Dec	Delta	direct
04 Dec - 28 Dec	Delta	direct
23 Dec - 30 Dec	Korean Air
25 Dec - 07 Jan	Hainan Airlines
22 Dec - 29 Dec	Air Canada
25 Dec - 07 Jan	Delta	direct
21 Dec - 18 Jan	Alaska Airlines
23 Dec - 30 Dec	Delta	direct
06 Dec - 02 Jan	Frontier Airlines
16 Dec - 04 Jan	Hawaiian Airlines
12 Dec - 02 Jan	Alaska Airlines
15 Dec - 02 Jan	Hawaiian Airlines
11 Dec - 01 Jan	Delta	direct
18 Dec - 05 Jan	Air Canada
20 Dec - 04 Jan	Air Canada

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 558€

Return flights