AirHint found the following cheapest return flights from Seattle (SEA) to Shanghai (PVG) in October 2025 (see full year).
Return flights
| 27 Oct - 30 Oct | Korean Air | ||
| 24 Oct - 09 Nov | United | ||
| 27 Oct - 30 Oct | Delta | direct | |
| 21 Oct - 21 Nov | Delta | direct | |
| 24 Oct - 09 Nov | Delta | direct |
Also check the deals for one-way flights from Seattle to Shanghai in October.
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