It is indeed possible, thanks to the grunion_contact_form_redirect_url filter.
You can find 2 possible ways to use that filter here:
https://gist.github.com/kraftbj/0238a0bbef3526c32f27
You'll need to place the code in a functionality plugin.
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Jeremy Herve on "[Plugin: Jetpack by WordPress.com] Jetpack Contact Form Redirect: Possible?"
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