add_action('template_redirect','check_if_logged_in');
function check_if_logged_in()
{
    $pageid = get_option( 'woocommerce_checkout_page_id' );
    if(!is_user_logged_in() && is_page($pageid))
    {
        $url = add_query_arg(
            'redirect_to',
            get_permalink($pagid),
            site_url('/my-account/') // your my account url
        );
        wp_redirect($url);
        exit;
    }
    if(is_user_logged_in())
    {
    if(is_page(get_option( 'woocommerce_myaccount_page_id' )))
    {

        $redirect = $_GET['redirect_to'];
        if (isset($redirect)) {
        echo '<script>window.location.href = "'.$redirect.'";</script>';
        }

    }
    }
}