Redirect Thank You Page

functions.php

<?php

/**
 * Redirects Thank You page after checkout in WooCommerce
 */

add_action( 'template_redirect', 'wc_redirect_post_checkout' ); 
function wc_redirect_post_checkout() {
	global $wp;

	if ( is_checkout() && ! empty( $wp->query_vars['order-received'] ) ) {
		wp_redirect( 'http://example.com' );
		exit;
	}
}