Cheap flights from IAD to LIS (Washington Dulles Intl. to Humberto Delgado)

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Cheap Flights from IAD to LIS starting at $305 One Way, $354 Round Trip

Prices starting at $354 for return flights and $305 for one-way flights to Humberto Delgado were the cheapest prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply.