Skyscanner (various airlines) offers Roundtrip Flights from St. Louis (STL) to Beijing (PEK), China for $333-$354 (sort by cheapest first) on select dates in October 2019 - March 2020. For prices and availability enter travel information on Skyscanner then proceed to select flights and book with an online travel agency. Thanks serra
Note, select flights may include 1-2 stops depending on the date.
Travel Availability (subject to change):
Departs St. Louis (STL):
Oct 1-4, 12-31
Nov 1-22, 25-30
Feb 2-6, 10-20, 22-27, 29
Good availability for returns with 7 or 9 day minimum stays depending on dates.