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Asiana Airlines, a recent Skytrax 5-star rated Words Best Airlines, has round trip airfares travelling from Los Angeles to Ho Chi Minh City, Vietnam for $ 516. Other airports to HCMC are a little more: SEA($ 535), ORD($ 541), and SFO($ 556). December departure is excluded, but you can depart Nov 30.
There is one stop. You can check out dates in www.google.com/flights and book on Orbitz.com