Delta, American Airlines, British Airways, Air France, and various other airlines have round-trip flights from Seattle (SEA) to Lisbon (LIS) for $506-$523 with a connection. Flights October to March. Departures on Monday, Tuesday, Wednesday, and Sunday.
Note: Carry-on bag is allowed for free on Delta, American Airlines, British Airways, and Air France. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
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Read More Cheap Flights: Seattle to Lisbon $506-$523 r/t – Delta / American / British Airways / Air France