add_filter( 'woocommerce_package_rates', 'snippetpress_hide_shipping_when_free_is_available', 100 ); function snippetpress_hide_shipping_when_free_is_available( $rates ) { $free_shipping = array(); foreach ( $rates as $rate_id => $rate ) { if ( 'free_shipping' === $rate->method_id ) { $free_shipping[ $rate_id ] = $rate; break; } } return ! empty( $free_shipping ) ? $free_shipping : $rates; }