add_action('template_redirect', 'mx_search_single_post_redirect'); function mx_search_single_post_redirect() { if (is_search()) { global $wp_query; if ($wp_query->post_count == 1 && $wp_query->max_num_pages == 1) { wp_redirect( get_permalink( $wp_query->posts['0']->ID ) ); exit; } } }