WooCommerce: Hide shipping option labels

functions.php

<?php 
// Paste everything below this line to your theme's functions.php file.

// Hide shipping option labels. 
// Example:
// — Regular Shipping: $20  => $20
// — Express Shipping: $30  => $30
// — Free Shipping          => Free
add_filter('woocommerce_cart_shipping_method_full_label', function($label) {
    @list(, $price) = explode(':', $label);
    return isset($price) ? ltrim($price) : 'Free';
}, 2);