Hainan Air via DealBase discounts select Hainan Air Roundtrip Flights to China from select cities in the U.S., with prices starting from $372.31. (On the DealBase landing page, click on "Hainan Air" in the top line to see this sale; on Hainan's sale page, you may have to click "Search Flights" under "Plan & Book" in the top banner to search for flights.) That's $4 under our mention from two weeks ago and the lowest price we've seen on Hainan Air.