Hannah S.L.

This plugin adds the option for a minimum order amount, as well as the option change the notification text for the cart page. Customers can’t proceed to checkout if the order doesn’t meet the minimum order amount.

WC Minimum Order Amount

Does the job and does it reliably. 
Cheers :). 

Simple. Working.

Add the option for a WooCommerce minimum order amount, as well as the options to change the notification texts for the cart.

Scott Stocker

The Minimum Order Amount for Checkout plugin allows you to set a minimum purchase amount for Woocommerce orders. The minimum amount can be based on the cart’s subtotal or total (including fees and taxes). The plugin displays a customizable error notification on both the cart and checkout pages. It also prevents an order from being submitted until the threshold amount has been satisfied.
The cart and checkout validation messages can be customized in the Woocommerce settings.

Minimum Order Amount for Checkout

Set a minimum purchase amount for Woocommerce orders.  Displays a validation message on both the cart and checkout pages and prevents orders below the …

WC Minimum Order Amount vs Minimum Order Amount for Checkout