I am not aware of such a report.
It really depends on your use case. (Are you wanting to reports to management something like "60% of Sales Interactions are transfers from Customer Service", or are you troubleshooting specific, individual Interactions?)
You can see, if you open the Interaction Details, where the interaction has been (timeline view), but that requires you to examine each interaction individually, which is painful!
Another option would be to use external reporting tools that allow you to report on Participant Data, then in your Flow you could set Participant Data with the name of the queue being transferred to.
Finally (and I haven't tried this out) you might be able to do something with Flow milestones / outcomes to indicate the flow being transferred to and then using those reports.
HTH
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Paul Simpson
Views expressed are my own and do not necessarily reflect those of my employer.
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