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Hainan Airlines [hainanairlines.com] have roundtrip airfare from Denver (DEN) to Shanghai (PVG) for $ 547 including taxes/fees. Domestic connecting portion will be on Alaska Airlines. This makes one or two stops, ymmv.

Travel Availability:
Departs DEN: Feb 15, 19, 22, 27; Sun/Mon/Wed/Fri Mar 3 thru May 5
Returns DEN: wide availability

Book this directly at Hainan Airlines [hainanairlines.com] because I see it’s a little bit more on travel sites. Screenshots for Hainan and Orbitz attached.