Cheap flights from Lisbon to Washington, D.C. from $329

The month of September is, on average, the cheapest month to fly to Washington, D.C. from Lisbon, with most prices found around $524. If you’re not able to fly to Washington, D.C. in September, then January is your next best option. Flight prices from Lisbon to Washington, D.C. during January average around $602.

On average, the least expensive day to fly to Washington, D.C. from Lisbon is on a Sunday. momondo users have found tickets for Sunday departures for as low as $658. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Lisbon to Washington, D.C. for around $885.

At noon is the cheapest time of day to fly from Lisbon to Washington, D.C. when you can find flight prices for as low as $484. Flying to Washington, D.C. at noon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the morning because they tend to be around $812. Of course, these prices can vary depending on the time of year and what airport you fly to.

Fly from Lisbon Humberto Delgado to Washington, D.C. Dulles Intl for the best Lisbon Humberto Delgado - Washington, D.C. flight prices

There are 3 cabin classes available to choose from on Lisbon Humberto Delgado to Washington, D.C. flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 18% on your flight if you consider stops on a Lisbon to Washington, D.C. flight.

Iberia, British Airways, and American Airlines are the most popular carriers operating from Lisbon Humberto Delgado to Washington, D.C.

TAP AIR PORTUGAL, United Airlines and British Airways are the top three most popular airlines that fly to Washington, D.C. from Lisbon according to our data. TAP AIR PORTUGAL is the first choice among our users, with 50% of people opting to fly with this airline when traveling to Washington, D.C.. Keep in mind that there are 3 different airlines that fly to Washington, D.C. on a routine basis, so you have a few additional options to choose from.

Historically, on average around 33% of flights between Lisbon and Washington, D.C. have experienced a delay on any given week. The average delay length over the past 12 months has been 134 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

Monday is statistically the day of the week which experiences the fewest number of delays on this flight route. Friday has historically seen more delays on average compared to the rest of the week.

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 28% of their flights experiencing any sort of delay.

Casablanca (CMN) was the most common stop: 71% of momondo users choosing 1-stop flights on this route connected there.

Flights via New York (JFK) offer the lowest average round-trip price of $544.

Flights connecting via New York (JFK) have the shortest average one-way travel time: 11h 32m.

New York (JFK) has the shortest average layover time for this route: 1h 22m.

The number of flights available between Lisbon and Washington, D.C. is 3 per day as of February 2026. The most frequent departure time is 11:00AM, with 60% of daily flights leaving at noon.

As of February 2026, 27 flights take off from Lisbon and land in Washington, D.C. each week. The most common flight departure day for this route is Thu, with 19% of weekly flights taking off on this day.