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

Return flights

03 Dec - 25 Dec	Asiana Airlines
03 Dec - 25 Dec	Delta	direct
06 Dec - 25 Dec	Delta	direct
09 Dec - 15 Jan	ANA
09 Dec - 15 Jan	Delta	direct
10 Dec - 15 Jan	ANA
10 Dec - 15 Jan	Delta	direct
11 Dec - 06 Jan	Alaska Airlines
18 Dec - 13 Jan	Alaska Airlines
22 Dec - 06 Jan	Hawaiian Airlines
15 Dec - 31 Dec	Korean Air
06 Dec - 02 Jan	Hawaiian Airlines
12 Dec - 01 Jan	Alaska Airlines
12 Dec - 02 Jan	Hawaiian Airlines
19 Dec - 31 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 670€

Return flights