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

Return flights

23 Dec - 30 Dec	Asiana Airlines
20 Dec - 19 Jan	Asiana Airlines
16 Dec - 04 Jan	Korean Air
15 Dec - 04 Jan	Korean Air
23 Dec - 30 Dec	Delta	direct
01 Dec - 12 Jan	Delta	direct
01 Dec - 05 Jan	Delta	direct
20 Dec - 02 Jan	Delta	direct
05 Dec - 09 Jan	Delta	direct
05 Dec - 06 Jan	Delta	direct
16 Dec - 04 Jan	Delta	direct
20 Dec - 19 Jan	Delta	direct
19 Dec - 26 Dec	Delta	direct
05 Dec - 26 Dec	Delta	direct

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.

Book a cheap hotel in Seattle

Cheap car rent in Seattle

Cheapest return flights from Shanghai to Seattle in December from 626€

Return flights