Cost to fix liquid damaged MacBook air

You'll need to take it to an authorized service center. It totally depends on what the tech finds after cracking open the computer and, to a degree, who looks at it. Be aware that the cost might create sticker shock. Also check your home owners or renters insurance to see if it is covered.

It's impossible for anyone here to estimate the cost of repairs since we have no way of knowing what may have been damaged.

It has been my experience that the only sure way to repair liquid damage to electronics is to replace it with new. So a new one will cost $999.