AirHint found the following cheapest return flights from Shanghai (SHA) to Seattle (SEA) in October 2025 (see full year).
Return flights
| 22 Oct - 29 Oct | Asiana Airlines | ||
| 26 Oct - 30 Oct | Asiana Airlines | ||
| 21 Oct - 28 Oct | Asiana Airlines | ||
| 26 Oct - 30 Oct | Delta | direct | |
| 21 Oct - 28 Oct | Delta | direct | |
| 22 Oct - 29 Oct | Delta | direct |
Also check the deals for one-way flights from Shanghai to Seattle in October.
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