China Eastern Airlines, a SkyTeam member airline, has Los Angeles LAX to the beach resort city Phuket, Thailand HKT at $397 through OTA sites and $430 on China Eastern Airlines website.
Bangkok is similarly priced at $389 round trip with China Eastern. There appears to be a fare war with China Eastern undercutting China Southern $401 ticket prices on some dates. Xiamen Airlines also has ticket prices in $400s to Bangkok.
These low fares are available Jan-May 2018.
China Eastern T fare earns 30% miles in most SkyTeam frequent flyer programs.
China Eastern Airlines – ExploreTrip.com OTA ticket found through Momondo.com search.
Los Angeles LAX – Shanghai PVG – Phuket HKT – PVG – LA
LAX – Bangkok BKK $389 round trip Momondo.com/ExploreTrip.com.
China Eastern Airlines ticket LAX – Phuket HKT