Cracked screen

If it is not a manufacturer's defect, accidental events are not covered by warranty, unless you have subscribed to an AppleCare+ protection plan.

This is the price list valid in US Apple Stores (tax excluded, work included):--> iPhone Screen Repair & Replacement - Official Apple Support

Check the above prices in your country, if you're out of USA.

Regards

Giulio

Usually, unless it's determined to be a result of a manufacturer's defect and not an accident or "abuse".