The fee to cancel Xfinity internet is that they they will usually take the number of months left in your contract and multiply them by $10. This is no different for Xfinity TV service. If you are looking for information on how to cancel Xfinity service, then this blog post has all the information that you need! We’ve got instructions on how to do it online or over the phone. Don't forget about our free cancellation and cord-cutting consultation.