United has flights from Dallas (DFW) to Dublin or Lisbon (DUB/LIS) for $365-$472 with a connection. Flights January to March. 7-day minimum stay required. Flight may operate as a Star Alliance code-share.
Note: Fare allows for a free carry-on bag, but checked bags will cost about +$60 each-way.
Note: Cheaper fares will have a longer connection.
Note: Other destinations in Europe are also on sale. See other posts.