What is the average cost to replace a MacBook Air 2020 keyboard?

You can get a repair cost estimate per the other posts, but that does not include what the Apple Store or Apple Authorized Service Center in your locale charges for labor, or when they open the Mac and discover other issues that may elevate the previously obtained repair cost.

Every repair has different costs but they are no published , from this link you can set an apportionment to take your Mac to an Apple Store for repair they can tell you how much is the costs for keyboard repairs

Mac Repair & Service - Apple Support

You're right in that the web page has cost estimates, but the advantage of going to a Genius Bar is the line that says, "We'll inspect your product when we receive it. If other issues are found, you could pay additional fees." If you're close to a Genius Bar it saves you the trouble of shipping just to get a firmer idea.

ronaries: They are unlikely to repair just a shift key. You should ask Apple but it wouldn't surprise me if they replaced the entire keyboard.

Go to this page to find your nearest Apple Authorized Service Provider (AASP) or Apple Authorized Distributor (AAD) --> Find Locations

How to make a Genius Bar appointment

1. Go to Genius Bar Reservation and Apple Support Options - Apple

2. Go to "Get hardware help".

3. Select your hardware and continue selecting options requiring replacing parts until you see "Bring in for Repair"

4. Sign in with your Apple ID

Also worth reading How to clean the keyboard of your MacBook or MacBook Pro - Apple Support

If you do take it or send it in for repair, make sure you do a complete backup, or several. You could get an erased device in return.

Apple has a “Get an Estimate” tool where you can receive an estimate cost for your MacBook repair, so you know the estimated cost before repair.

Learn more ⇢ Mac Repair & Service - Apple Support

-Zachyy ✌️

Every repair does indeed have different costs, which can all be viewed by using the “Get an Estimate” tool on Apple’s Repair and Service page. You do not have to go to an Apple Store to get a repair cost, Apple makes it easy by allowing you to do it online.

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~Katana-San~