How to change redirect after moving a page to trash?

Hook into load-{screen_id} and check if the $_GET['trashed'] variable is 1 or above.

add_action('load-edit.php','wpse_trashed_redirect');
function wpse_trashed_redirect(){
    $screen = get_current_screen();
    if('edit-page' == $screen->id){
        if( isset($_GET['trashed']) &&  intval($_GET['trashed']) >0){
            $redirect = add_query_arg(array('page'=>'custom_page_oder', 'trashed' => false, 'ids' => false ));
            wp_redirect($redirect);
            exit();
        }
    }
}

This works – and I’m not aware of a better way of doing this…