Can Uber set up a roundtrip fare?
The Guru Take
Uber is an "on demand" service. No "roundtrip" concept.
As Uber is an on-demand service, you request a ride when you need a ride. There are ways to schedule a ride in advance, but this isn't so much considered a round-trip in a traditional sense, and there are no discounts. So in most cases, if you need a ride home, make sure Uber is supported at the destination, and you can request another ride when it is time to return.
If you are making a very brief stop, you can make it a round-trip by either asking the driver politely to wait for you or leverage the multiple destination feature on the Uber app.