It is clearly said in the Game of Thrones series that fire destroys wights.
Also it is known that dragonglass and valyrian steel can destroy both wights and white walkers.
Can white walkers also be destroyed by fire like the wights?
We know that normal fire does not affect them. They are seen walking right through the fire created by the children to shield the cave from the incoming wights, and the fire appears to extinguish before them. We also see the White Walker that Jon kills walk into a burning building, seemingly unfazed.
It is not clear whether they can be destroyed by dragonfire.
As per this other question here it seems likely that dragon fire could also kill White Walkers. It cites:
“Dragonglass.” The red woman’s laugh was music. “Frozen fire, in the tongue of old Valyria. Small wonder it is anathema to these cold children of the Other.
A Storm of Swords
This would suggest that, because the glass is related to dragons (in the lore at least) it can kill Walkers. It would be easy to assume "unfrozen" dragon fire would have a similar killing effect.