American Airlines, Iberia, and British Airways, have round-trip flights from Dallas (DFW) to Porto (OPO) for $529 with a connection. Flights October to December. Departures on Tuesday. 7-day minimum stay required.
Note: Carry-on bag is allowed for free on American Airlines, Iberia, and British Airways. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.