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

View $347 flight on Sun, Sep 21, 2025Opens in a new window

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

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 $491 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Scandinavian Airlines
Sat, Jan 10 - Sun, Jan 18
IAD
Washington
LIS
Lisbon
$491 Roundtrip, found 6 hours ago
$491
Roundtrip
found 6 hours ago
Select Scandinavian Airlines flight, departing Sat, Jan 10 from Washington to Lisbon, returning Sun, Jan 18, priced at $491 found 6 hours ago
Aer Lingus
Tue, Oct 21 - Thu, Nov 6
IAD
Washington
LIS
Lisbon
$539 Roundtrip, found 3 days ago
$539
Roundtrip
found 3 days ago
Select Aer Lingus flight, departing Tue, Oct 21 from Washington to Lisbon, returning Thu, Nov 6, priced at $539 found 3 days ago
British Airways
Wed, Jan 7 - Tue, Jan 20
IAD
Washington
LIS
Lisbon
$543 Roundtrip, found 4 days ago
$543
Roundtrip
found 4 days ago
Select British Airways flight, departing Wed, Jan 7 from Washington to Lisbon, returning Tue, Jan 20, priced at $543 found 4 days ago
Royal Air Maroc
Sun, Oct 12 - Tue, Oct 28
IAD
Washington
LIS
Lisbon
$613 Roundtrip, found 1 hour ago
$613
Roundtrip
found 1 hour ago
Select Royal Air Maroc flight, departing Sun, Oct 12 from Washington to Lisbon, returning Tue, Oct 28, priced at $613 found 1 hour ago
TAP Portugal
Sun, Sep 21 - Wed, Oct 1
IAD
Washington
LIS
Lisbon
$640 Roundtrip, found 4 hours ago
$640
Roundtrip
found 4 hours ago
Select TAP Portugal flight, departing Sun, Sep 21 from Washington to Lisbon, returning Wed, Oct 1, priced at $640 found 4 hours ago
Turkish Airlines
Wed, Dec 3 - Tue, Dec 23
IAD
Washington
LIS
Lisbon
$641 Roundtrip, found 2 days ago
$641
Roundtrip
found 2 days ago
Select Turkish Airlines flight, departing Wed, Dec 3 from Washington to Lisbon, returning Tue, Dec 23, priced at $641 found 2 days ago
Icelandair
Wed, Oct 1 - Thu, Oct 16
IAD
Washington
LIS
Lisbon
$701 Roundtrip, found 9 hours ago
$701
Roundtrip
found 9 hours ago
Select Icelandair flight, departing Wed, Oct 1 from Washington to Lisbon, returning Thu, Oct 16, priced at $701 found 9 hours ago
American Airlines
Tue, May 12 - Thu, May 21
IAD
Washington
LIS
Lisbon
$749 Roundtrip, found 4 hours ago
$749
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Tue, May 12 from Washington to Lisbon, returning Thu, May 21, priced at $749 found 4 hours ago
Iberia
Tue, May 12 - Thu, May 21
IAD
Washington
LIS
Lisbon
$759 Roundtrip, found 4 hours ago
$759
Roundtrip
found 4 hours ago
Select Iberia flight, departing Tue, May 12 from Washington to Lisbon, returning Thu, May 21, priced at $759 found 4 hours ago
United
Tue, Nov 11 - Fri, Nov 21
IAD
Washington
LIS
Lisbon
$803 Roundtrip, found 4 hours ago
$803
Roundtrip
found 4 hours ago
Select United flight, departing Tue, Nov 11 from Washington to Lisbon, returning Fri, Nov 21, priced at $803 found 4 hours ago

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

November is typically the cheapest month to fly

From $446 - $904 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 $1,050
LIS
Humberto Delgado
Cheapest
Flights from $1,050
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
$491
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 January. 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?
Lock in a cheap one-way flight from $347 or cheap return flight from $491 from Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS)?
January is the cheapest month to fly from IAD to LIS. Traveling outside of peak seasons is often the key to finding better deals on flights.
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 Washington Dulles Intl. Airport (IAD) to Humberto Delgado Airport (LIS)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll fly you from IAD to LIS. Then, sort your results by "Price (lowest to highest)" to pick up a great deal.
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.

Explore a world of travel with Expedia

*Available to One Key members.