WooCommerce - Hide shipping rates when free shipping is available.

functions.php

<?php
/**
 * Hide shipping rates when free shipping is available.
 * Updated to support WooCommerce 2.6 Shipping Zones.
 *
 * @param array $rates Array of rates found for the package.
 * @return array
 */
function my_hide_shipping_when_free_is_available( $rates ) {
	$free = array();

	foreach ( $rates as $rate_id => $rate ) {
		if ( 'free_shipping' === $rate->method_id ) {
			$free[ $rate_id ] = $rate;
			break;
		}
	}

	return ! empty( $free ) ? $free : $rates;
}

add_filter( 'woocommerce_package_rates', 'my_hide_shipping_when_free_is_available', 100 );

add_filter('woocommerce_package_rates', 'hide_shipping_when_free_is_available', 10, 2);
function hide_shipping_when_free_is_available($rates, $package) {
$free_yn = 0;
$pickup_yn = 0;
foreach($rates as $key => $value) {
$key_part = explode(":", $key);
$method_title = $key_part[0];
if ('free_shipping' == $method_title) {
// check if free shipping rate exists
$free_yn = 1;
$free_shipping = $rates[$key];
$free_key = $key;
}
if ('local_pickup' == $method_title) {
// check if local pickup rate exists
$pickup_yn = 1;
$local_pickup = $rates[$key];
$pickup_key = $key;
}
}
if ($free_yn == 1) {
// Unset all rates.
$rates = array();
// Restore free shipping rate.
$rates[$free_key] = $free_shipping;
if ($pickup_yn == 1) {
// Restore local pickup rate.
$rates[$pickup_key] = $local_pickup;
}
return $rates;
}
return $rates;
}

@masjo Brilliant! Still works awesome in 2022! God bless you!