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

Return flights

01 Dec - 05 Dec	Korean Air
05 Dec - 12 Dec	Air Canada
05 Dec - 12 Dec	Delta	direct
01 Dec - 05 Dec	Delta	direct
06 Dec - 25 Dec	Delta	direct
25 Dec - 08 Jan	Korean Air
06 Dec - 02 Jan	Frontier Airlines
25 Dec - 08 Jan	Delta	direct
25 Dec - 01 Jan	Korean Air
19 Dec - 30 Dec	Air Canada
21 Dec - 18 Jan	Alaska Airlines
24 Dec - 03 Jan	Korean Air
25 Dec - 01 Jan	Delta	direct
25 Dec - 04 Jan	Korean Air
25 Dec - 04 Jan	Delta	direct
12 Dec - 02 Jan	Hawaiian Airlines
19 Dec - 30 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 739€

Return flights