Iberia, American Airlines, and British Airways, have round-trip flights from New York (JFK) to Lisbon (LIS) for $281 with a connection. Flights October to March. Departures on Tuesday and Wednesday. 7-day minimum stay required.
Note: Carry-on bag is allowed for free on Iberia, American Airlines, and British Airways. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.