We are looking to go to Europe during summer 2019. I love the dream maps for finding prices on the outbound, but have a problem finding a good way to do this on the return (we need to come back to a different city in the states than we are leaving from)

Do any "dream maps" let you do a return from a broad area? Google Flights Map and Farecompare's only allow Europe to be the destination, not the outbound on a one-way search (have to have a specific city on the origin)