Originally Posted by
catocony
That might be a decent option. A one-way award from IAD-CLE could get the OP home sooner and not cost much more than a taxi or Uber from IAD to DCA.
A OW cash ticket IAD-CLE purchased now (well in advance) runs around $275, so not a great deal. But, as OP is on an award ticket LIS-WAS-CLE, he ought to be able to change to the IAD flight without cost if the space is available. Problem is that he's got a C award, my guess is Saver and although he doesn't likely care about class of service on the IAD-CLE micro-hop, it's pricing high.
I'm not sure he asked correctly, but it's perhaps worth a call back to see if UA will acommodate him on the IAD flight in Y.