1 hr 35 min is the shortest flight time from Guiyang to Haikou.

The best one-way deal was with China Southern from $160.

There are direct flights from Guiyang to Haikou on a daily basis.

China Southern, Tianjin Airlines, Hainan and Fuzhou Airlines fly direct from Guiyang to Haikou.Use the Stops filter while searching for flights, to see only nonstop options in your results.

The cheapest one-way flight starts at $160 and departs on Wed, Dec 4.

Most visitors arrive in spring (Mar–May) and winter (Nov–Feb), when the weather is mild and mostly dry thanks to the city’s sub-tropical location. The hot and humid rainy season (Jun–Oct) can also be busy due to local holidays, though typhoons are possible at this time. Events include the Lantern Festival (Feb), Junpo Festival (Mar), celebrated with street parades and traditional folk performances, the Hainan international Coconut Festival (Apr), and the Dragon Boat Festival (Jun).

It's easy to use Google Flights to find the cheapest days to fly from Guiyang to Haikou.
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.