InfoPath form - redirect to new page on submit

I ran into the same thing when trying to leverage the source parameter in the infopath form url. I found this article https://sharepoint.stackexchange.com/questions/41291/redirect-a-user-after-submitting-an-infopath-form that recommends this script... 

<script type="text/javascript">
function RedirectIfFormIsClosed(){
    var elem = document.getElementById('DialogFinalMessage');
    if (elem !== null && elem.children.length > 0) {        window.location.href = GetSource2();
    }
}
ExecuteOrDelayUntilScriptLoaded(RedirectIfFormIsClosed, "inplview.js")
</script>

 So basically then you can define the Thank You URL using source= and if you don't want to use source you simply replace the variable 

GetSource2()

with your Thank You URL.

Note: I ended up using a second view and didn't try the above. Maybe I will try it out now :)