[09/19/2019 @ 6:46 PM CT] Deal is back on.
Delta has round-trip flights from Dallas (DAL/DFW) to Madrid or Barcelona (MAD/BCN) for $454-$467 with a connection. Flights vary, November to February. Departures are mostly midweek. No Fridays or Saturdays. 7-day minimum stay required.
Note: Carry-on bag is allowed for free on Delta. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.