Cheap Flights from Washington to Lisbon

A nonstop flight from Washington Dulles to Lisbon takes approximately 7 hours 15 minutes to 7 hours 55 minutes, covering about 3,583 miles, depending on winds and the specific carrier. Return flights from Lisbon to Washington typically run a bit longer due to headwinds.

November and January are generally the cheapest months to fly from Washington to Lisbon, based on 12-month fare averages from major flight search engines. June, July, and August are typically the most expensive.

United Airlines and TAP Air Portugal both operate nonstop flights between Washington Dulles International Airport (IAD) and Lisbon's Humberto Delgado Airport (LIS). British Airways, Lufthansa, Air France-KLM, and Iberia also serve the route with a single connection.

Washington Dulles (IAD) is the only Washington-area airport with nonstop LIS service. Reagan National (DCA) and Baltimore/Washington (BWI) travelers can still find competitive one-stop fares, so it's worth comparing all three before booking.

For this transatlantic route, booking 2 to 4 months ahead typically offers the best balance of price and flight choice. Booking too far out or waiting until the last few weeks before departure usually costs more.

Fares fluctuate more than they do on shorter domestic routes, but midweek departures, flexible date searches, and comparing nonstop against one-stop options can turn up last-minute IAD to LIS flight deals, particularly outside the June–August peak.

Washington, D.C. and Lisbon are approximately 3,583 miles (5,767 km) apart by air, making this one of the more heavily flown routes between the US East Coast and the Iberian Peninsula.

On this route, round-trip fares are often more cost-effective per mile than two separate one-way tickets, though one way flights from Washington to Lisbon can make sense for open-jaw itineraries that continue on elsewhere in Europe.

US citizens can currently enter Portugal, a Schengen Area country, for short tourist or business stays of up to 90 days within a 180-day period without a visa. Entry requirements can change, so it's worth confirming current rules and passport validity before you travel.

Lisbon is typically 5 hours ahead of Washington, D.C. The exact gap can shift slightly depending on daylight saving time changes in each region, which don't always align on the same calendar dates.

A valid passport is required, and it should generally have at least 3–6 months of validity remaining beyond your planned departure date from the Schengen Area. Check the latest passport and entry requirements before booking.