$347 Cheap Flights from Washington (IAD) to Lisbon (LIS)

View $347 flight on Mon, Aug 18, 2025Opens in a new window

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

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Cheap Flights from Washington to Lisbon (IAD-LIS)

Prices were available within the past 7 days and start at $347 for one-way flights and $473 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Scandinavian Airlines
Sat, Dec 6 - Wed, Dec 10
IAD
Washington
LIS
Lisbon
$473 Roundtrip, found 6 hours ago
$473
Roundtrip
found 6 hours ago
Select Scandinavian Airlines flight, departing Sat, Dec 6 from Washington to Lisbon, returning Wed, Dec 10, priced at $473 found 6 hours ago
TAP Portugal
Wed, Nov 26 - Wed, Dec 3
IAD
Washington
LIS
Lisbon
$637 Roundtrip, found 3 hours ago
$637
Roundtrip
found 3 hours ago
Select TAP Portugal flight, departing Wed, Nov 26 from Washington to Lisbon, returning Wed, Dec 3, priced at $637 found 3 hours ago
Royal Air Maroc
Sun, Oct 26 - Wed, Nov 12
IAD
Washington
LIS
Lisbon
$639 Roundtrip, found 1 day ago
$639
Roundtrip
found 1 day ago
Select Royal Air Maroc flight, departing Sun, Oct 26 from Washington to Lisbon, returning Wed, Nov 12, priced at $639 found 1 day ago
Turkish Airlines
Mon, Nov 10 - Thu, Nov 27
IAD
Washington
LIS
Lisbon
$652 Roundtrip, found 3 days ago
$652
Roundtrip
found 3 days ago
Select Turkish Airlines flight, departing Mon, Nov 10 from Washington to Lisbon, returning Thu, Nov 27, priced at $652 found 3 days ago
Aer Lingus
Tue, Aug 26 - Thu, Oct 2
IAD
Washington
LIS
Lisbon
$670 Roundtrip, found 6 hours ago
$670
Roundtrip
found 6 hours ago
Select Aer Lingus flight, departing Tue, Aug 26 from Washington to Lisbon, returning Thu, Oct 2, priced at $670 found 6 hours ago
Icelandair
Wed, Nov 12 - Sun, Nov 16
IAD
Washington
LIS
Lisbon
$672 Roundtrip, found 1 day ago
$672
Roundtrip
found 1 day ago
Select Icelandair flight, departing Wed, Nov 12 from Washington to Lisbon, returning Sun, Nov 16, priced at $672 found 1 day ago
United
Wed, Dec 10 - Tue, Dec 16
IAD
Washington
LIS
Lisbon
$684 Roundtrip, found 22 hours ago
$684
Roundtrip
found 22 hours ago
Select United flight, departing Wed, Dec 10 from Washington to Lisbon, returning Tue, Dec 16, priced at $684 found 22 hours ago
Air Canada
Tue, Mar 24 - Tue, Mar 31
IAD
Washington
LIS
Lisbon
$690 Roundtrip, found 2 days ago
$690
Roundtrip
found 2 days ago
Select Air Canada flight, departing Tue, Mar 24 from Washington to Lisbon, returning Tue, Mar 31, priced at $690 found 2 days ago
American Airlines
Mon, Jan 12 - Thu, Jan 22
IAD
Washington
LIS
Lisbon
$692 Roundtrip, found 6 days ago
$692
Roundtrip
found 6 days ago
Select American Airlines flight, departing Mon, Jan 12 from Washington to Lisbon, returning Thu, Jan 22, priced at $692 found 6 days ago
British Airways
Mon, Jan 12 - Thu, Jan 22
IAD
Washington
LIS
Lisbon
$693 Roundtrip, found 6 days ago
$693
Roundtrip
found 6 days ago
Select British Airways flight, departing Mon, Jan 12 from Washington to Lisbon, returning Thu, Jan 22, priced at $693 found 6 days ago

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

November is typically the cheapest month to fly

From $440 - $952 per traveler.

Graph displaying average flight prices per month

Alternative airports near Lisbon

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

Select flight to Humberto Delgado LIS. Cheapest option available. Flights from $1,186
LIS
Humberto Delgado
Cheapest
Flights from $1,186
Flights from Washington (IAD) to Lisbon (LIS)
Origin airport
Washington Dulles Intl.
Destination airport
Humberto Delgado
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, JetBlue Airways, KLM, Lufthansa, Royal Air Maroc, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic
Roundtrip price
$472
Distance
3582 mi
Average flight time
12 hours 18 mins

Washington to Lisbon Flights

The cheapest times to fly from Washington to Lisbon

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 Washington to Lisbon are during the month of December. You can find some of the cheapest flights from Washington to Lisbon with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Lisbon

Sunday is one of the best days to book for cheap flights from Washington to Lisbon: 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 Washington to Lisbon

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 Washington to Lisbon in 2025. You can also book with separate airlines for your outbound and return journeys, from $347 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 Washington to Lisbon 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 Washington to Lisbon 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 Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS) cost?
Cheap round-trip fares from Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS) start at $690. 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 TAP Portugal flight leaving IAD on July 28 2025 and touching down at LIS. The price was last updated on July 2 2025 and has not changed since.
What is the cheapest month to fly from IAD to LIS?
The cheapest flights from IAD to LIS 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 Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS)?
You can fly straight from Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS) on a TAP Portugal flight.
What is the cheapest airline that flies from IAD to LIS?
With prices as low as $347 for a one-way journey from IAD to LIS, TAP Portugal is currently the cheapest airline 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 IAD on August 19 2025. Prices were last updated on July 2 2025 and have not changed since.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS)?
On average, Washington Dulles Intl. Airport (IAD) has 6 direct flights to Humberto Delgado Airport (LIS) weekly. If you're looking for more choice, take advantage of Expedia's filters to look for flights with layovers. Squeeze in a visit to another location or simply break up your travels.
What are the most popular departure times for flights from Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS)?
The 5 PM departures from IAD to LIS are the busiest. Prices can be higher for these popular slots. If you want to save on your fare, pick a less crowded time to fly.
What day of the week has the most flights from IAD to LIS?
If you travel on a Friday, you'll get the widest range of options for flights from Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS).
What is the earliest flight from Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS)?
Washington Dulles Intl. Airport (IAD)'s first flight to Humberto Delgado Airport (LIS) is at approximately 5:30PM UTC-5. With a total flight time of 7h 5m, you'll touch down at around 5:35AM UTC+0.
How long does it take to fly from Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS)?
The average flight time from IAD to LIS is 7 hours and 5 minutes, covering a total distance of 3,600 mi.
What airline has the least delays from IAD to LIS?
Lufthansa has the best performance for on-time direct flights from Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS), with an on-time score of 100%. Use the Expedia App to view your flight status before you jet off and get notified of any changes.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS)?
Book a flight from Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS) that takes off before 3 PM to reduce the likelihood of delays. Departures after this hour have a 22% higher chance of being canceled, on average.**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 Lisbon District from Washington Dulles Intl. Airport (IAD)?
Humberto Delgado Airport (LIS) is the only airport in Lisbon District with direct flights from Washington Dulles Intl. Airport (IAD). Compare the options and find affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS) last-minute?
Waiting until just before your departure to book a ticket from IAD to LIS generally means paying more. Although you may find some last-minute discounts, they aren't always guaranteed. Be flexible with your itinerary to boost your chances of getting a bargain.
Is it cheaper to book an IAD to LIS flight and hotel package?
Compared with arranging hotels and flights separately, booking an IAD to LIS flight and hotel package with Expedia could lead to significant savings. Better still, managing everything in one place will take the hassle out of travel planning. Just secure your flights and select from our wide range of hotels, then customize your trip with extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS)?
It's generally possible to reschedule or cancel your IAD to LIS flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more information on our Customer Service portal.

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