Flight Langkawi International Airport departs from Langkawi Langkawi International Airport at 10:15 and arrives at Phuket Phuket International Airport at 10:45.
The flighttime is about 1h 30m. The distance travelled ("as the bird flies"): 160 Km. So the average speed is roughly 107 Km.
There is an 1 hour time difference between Langkawi and Phuket