Marcel Tannich

This plugin will hide the WooCommerce “Update Cart” button and reload the quantity changes dynamic over jQuery. You don’t need this extra click anymore!
This Plugin is based on a posting on StackExchange related to WordPress developers. I modified the basic concept and created a plugin out of it that WordPress users with less experience in PHP can integrate this function easily without destroying their functions.php file.
There are no options. Just activate the plugin and it will works.
<h3>Plugin Requirements</h3>
<ul>
<li>This plugin requires WordPress 4.9 or greater</li>
<li>This plugin requires WooCommerce 3.0.0</li>
<li>This plugin requires PHP 5.6 or greater</li>
</ul>

Dynamic Cart Quantity for WooCommerce

bhavik.kiri

This plugin will allow the customers to change the quantity using WooCommerce standard quantity field & delete the product on the WooCommerce checkout page.

Change Quantity on Checkout for WooCommerce

Works like a charm. Should be part of WooCommerce.

Does what it says on the tin!

Allow the customers to change the quantity & delete the product on the checkout page for WooCommerce.

Dynamic Cart Quantity for WooCommerce vs Change Quantity on Checkout for WooCommerce