$375 Cheap Flights from Lisbon (LIS) to Washington (IAD)

View $375 flight on Mon, Oct 20, 2025Opens in a new window

Popular airlines from Humberto Delgado Airport (LIS) to Washington Dulles Intl. Airport (IAD)

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Cheap Flights from Lisbon to Washington (LIS-IAD)

Prices were available within the past 7 days and start at $375 for one-way flights and $501 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Wed, Nov 19 - Sat, Dec 6
LIS
Lisbon
IAD
Washington
$501 Roundtrip, found 3 hours ago
$501
Roundtrip
found 3 hours ago
Select TAP Portugal flight, departing Wed, Nov 19 from Lisbon to Washington, returning Sat, Dec 6, priced at $501 found 3 hours ago
Scandinavian Airlines
Wed, Oct 29 - Sat, Nov 15
LIS
Lisbon
IAD
Washington
$510 Roundtrip, found 3 hours ago
$510
Roundtrip
found 3 hours ago
Select Scandinavian Airlines flight, departing Wed, Oct 29 from Lisbon to Washington, returning Sat, Nov 15, priced at $510 found 3 hours ago
British Airways
Thu, Oct 9 - Thu, Oct 16
LIS
Lisbon
IAD
Washington
$548 Roundtrip, found 3 hours ago
$548
Roundtrip
found 3 hours ago
Select British Airways flight, departing Thu, Oct 9 from Lisbon to Washington, returning Thu, Oct 16, priced at $548 found 3 hours ago
American Airlines
Wed, Sep 24 - Tue, Oct 28
LIS
Lisbon
IAD
Washington
$551 Roundtrip, found 1 day ago
$551
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Sep 24 from Lisbon to Washington, returning Tue, Oct 28, priced at $551 found 1 day ago
Aer Lingus
Fri, Sep 12 - Sat, Sep 27
LIS
Lisbon
IAD
Washington
$565 Roundtrip, found 1 day ago
$565
Roundtrip
found 1 day ago
Select Aer Lingus flight, departing Fri, Sep 12 from Lisbon to Washington, returning Sat, Sep 27, priced at $565 found 1 day ago
Lufthansa
Fri, Nov 21 - Sat, Nov 29
LIS
Lisbon
IAD
Washington
$572 Roundtrip, just found
$572
Roundtrip
just found
Select Lufthansa flight, departing Fri, Nov 21 from Lisbon to Washington, returning Sat, Nov 29, priced at $572 just found
Iberia
Thu, Oct 9 - Thu, Oct 16
LIS
Lisbon
IAD
Washington
$573 Roundtrip, found 3 hours ago
$573
Roundtrip
found 3 hours ago
Select Iberia flight, departing Thu, Oct 9 from Lisbon to Washington, returning Thu, Oct 16, priced at $573 found 3 hours ago
Air Canada
Fri, Sep 12 - Sat, Sep 27
LIS
Lisbon
IAD
Washington
$582 Roundtrip, found 1 day ago
$582
Roundtrip
found 1 day ago
Select Air Canada flight, departing Fri, Sep 12 from Lisbon to Washington, returning Sat, Sep 27, priced at $582 found 1 day ago
Swiss International Air Lines
Thu, Jun 4 - Mon, Jun 8
LIS
Lisbon
IAD
Washington
$584 Roundtrip, just found
$584
Roundtrip
just found
Select Swiss International Air Lines flight, departing Thu, Jun 4 from Lisbon to Washington, returning Mon, Jun 8, priced at $584 just found
United
Wed, Nov 5 - Fri, Nov 28
LIS
Lisbon
IAD
Washington
$595 Roundtrip, found 3 hours ago
$595
Roundtrip
found 3 hours ago
Select United flight, departing Wed, Nov 5 from Lisbon to Washington, returning Fri, Nov 28, priced at $595 found 3 hours ago

Find the cheapest month to fly from Lisbon (LIS) to Washington (IAD)

November is typically the cheapest month to fly

From $394 - $822 per traveler.

Graph displaying average flight prices per month

Alternative airports near Washington

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Ronald Reagan Washington National DCA. Closest option available. Average driving time to city center is 8 minutes. Flights from $741
DCA
Ronald Reagan Washington National
Closest
Average driving time to city center8 min
Flights from $741
Flights from Lisbon (LIS) to Washington (IAD)
Origin airport
Humberto Delgado
Destination airport
Washington Dulles Intl.
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, ITA Airways, Iberia, JetBlue Airways, KLM, Lufthansa, Royal Air Maroc, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United
Roundtrip price
$501
Distance
3582 mi
Average flight time
3 hours 18 mins

Lisbon to Washington Flights

The cheapest times to fly from Lisbon to Washington

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Lisbon to Washington are during the month of November. You can find some of the cheapest flights from Lisbon to Washington with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Lisbon to Washington

Sunday is one of the best days to book for cheap flights from Lisbon to Washington: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Lisbon to Washington

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Lisbon to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $375 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Lisbon to Washington flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Lisbon to Washington airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Humberto Delgado Airport (LIS) to Washington Dulles Intl. Airport (IAD) cost?
You can land affordable return tickets from Humberto Delgado Airport (LIS) to Washington Dulles Intl. Airport (IAD) starting at $595. Grab your seat and start your adventure. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Lufthansa flight leaving LIS on August 7 2025 and touching down at IAD. The price was last updated on July 23 2025 and has not changed since.
What is the cheapest month to fly from LIS to IAD?
The cheapest flights from LIS to IAD are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Humberto Delgado Airport (LIS) to Washington Dulles Intl. Airport (IAD)?
Take a direct flight with TAP Portugal and journey straight from Humberto Delgado Airport (LIS) to Washington Dulles Intl. Airport (IAD).
What is the cheapest airline that flies from LIS to IAD?
With prices starting from $560 for a one-way journey from LIS to IAD, TAP Portugal is currently the cheapest carrier operating this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from LIS on September 13 2025. Prices were last updated on July 23 2025 and have not changed since.
How many flights per day from Humberto Delgado Airport (LIS) to Washington Dulles Intl. Airport (IAD)?
On average, Humberto Delgado Airport (LIS) offers 6 nonstop flights to Washington Dulles Intl. Airport (IAD) weekly. For more options, take advantage of Expedia's filter tool to discover flights with one or two stops. Squeeze in a visit to another location or simply break up your travels.
What are the most popular departure times for flights from Humberto Delgado Airport (LIS) to Washington Dulles Intl. Airport (IAD)?
Flights between LIS and IAD are their busiest at 5 PM. If you're after a more relaxed trip and potentially cheaper prices, choose a departure that's outside typical rush times.
What day of the week has the most flights from LIS to IAD?
Friday offers the most flights from Humberto Delgado Airport (LIS) to Washington Dulles Intl. Airport (IAD). Consider taking off on this day and you'll have a greater chance of finding a departure that fits your plans.
What is the earliest flight from Humberto Delgado Airport (LIS) to Washington Dulles Intl. Airport (IAD)?
Take the earliest flight at around 10:45AM UTC+0, departing from Humberto Delgado Airport (LIS). You'll be in the air for about 8h 45m, coming in to land at Washington Dulles Intl. Airport (IAD) at approximately 2:30PM UTC-5.
How long does it take to fly from Humberto Delgado Airport (LIS) to Washington Dulles Intl. Airport (IAD)?
Typically, it takes 8 hours and 45 minutes to cover the 3,600 mi from LIS to IAD.
What is the best time to fly from Humberto Delgado Airport (LIS) to Washington Dulles Intl. Airport (IAD)?
To arrive at Washington Dulles Intl. Airport (IAD) on time, book a flight that takes off from Humberto Delgado Airport (LIS) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Washington from Humberto Delgado Airport (LIS)?
If you're boarding a direct flight from Humberto Delgado Airport (LIS) to Washington, Washington Dulles Intl. Airport (IAD) is the only airport you can land at.
Is it cheaper to buy a plane ticket from Humberto Delgado Airport (LIS) to Washington Dulles Intl. Airport (IAD) last-minute?
Last-minute fares from LIS to IAD are generally more expensive. To secure the best prices, start looking for flights as early as possible. That being said, if your travel plans are flexible, you may score a cheap ticket right before your journey.
Is it cheaper to book a LIS to IAD flight and hotel package?
You can save money by booking a LIS to IAD flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. Once you've chosen your ideal accommodations and flights, consider other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from Humberto Delgado Airport (LIS) to Washington Dulles Intl. Airport (IAD)?
If you booked your LIS to IAD flight in the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more information.

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*Available to One Key members.