The Contact Form 7 Plugin is an incredibly useful plugin and a great addition to any WordPress Installation. It is very well supported and regularly updated.
It does not, however, have a built-in redirect to a thank you page. Nonetheless, it has been very simple, to just use the
method to add a redirection to a “Thank You” page after a successful form submission. But that method is being deprecated soon and I wanted to find a simple alternative.
In the above example '1234' is replaced by the Contact Form 7 shortcode form number and the location url is for your own "Thank You" page.