// Redirect custom thank you
 
add_action( 'woocommerce_thankyou', 'redirectcustom');
 
function redirectcustom( $order_id ){
    $order = new WC_Order( $order_id );
 
    $url = 'http://yoursite.com/my-cool-thank-you-page';
 
    if ( $order->status != 'failed' ) { 
        echo "<script type='text/javascript'>window.location = '" . $url . "'</script>";
    }
}

I searched everywhere to do something like this, hope it helps you as it did me 🙂