WooCommerce: Display ONLY on-sale products in Shop

Question

I need to create a products archive page (usually the Shop page in WooCommerce) but displays ONLY the ON SALE<

Answer 1

@gmaggio using query_posts() will break your site. Use pre_get_posts

add_filter( 'pre_get_posts', 'catalog_filters' );
function catalog_filters( $query ) {
    if ( $query->is_main_query() && $query->post_type = 'product' ) {
        if(isset($_GET['onsale'])) {
            $meta_query = array(
                'relation' => 'OR',
                array( // Simple products type
                'key' => '_sale_price',
                'value' => 0,
                'compare' => '>',
                'type' => 'numeric'
                ),
                array( // Variable products type
                'key' => '_min_variation_sale_price',
                'value' => 0,
                'compare' => '>',
                'type' => 'numeric'
                )
            ); $query->set('meta_query', $meta_query);
        }
        if(isset($_GET['bestsellers'])) {
            $meta_query     = array(
            array( 
                'key'           => 'total_sales',
                'value'         => 0,
                'compare'       => '>',
                'type'          => 'numeric'
                )
            );
        }
    }

return $query;
}