The iPhone XR screen repair cost is now set by Apple
Compared with $279 for the iPhone X/XS or $329 for the XS Max, this may seem like a bargain but going around the notch is priced higher than, say, repairing the iPhone 8 Plus display which is an LCD panel, too, but with higher resolution than what we have on the XR.
As mentioned, the "other" damage category that includes a shattered glass casing, costs $399 for the iPhone XR as Apple basically scrapes all the internals out to replace the whole body of its newest handsets.
Needless to say, if you are the type that drops their phones with damaging consequences at least once a year, the AppleCare+ fee is worth it. Alternatively, you can just put a good screen protector on the XR for a few tens, and then hope and pray when it meets the pavement.