How much does Apple Care cost for an XR phone?

Buy an AppleCare plan [was: Can I buy an AppleCare plan for my device?] Click here --> https://support.apple.com/HT202702

"In most countries and regions, you can buy AppleCare+ within 60 days of your device purchase. In Japan, you can buy AppleCare+ within 30 days of your device purchase. In some countries and regions, you can buy an AppleCare Protection Plan within 1 year of your purchase of an eligible Mac, Apple TV, or other device."

Sorry. You had 60 days from date of original purchase to add an AppleCare+ Plan to your phone. Since your phone is now out of warranty, you've clearly gone way past that date.