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Dulles Intl

$363+ Cheap flights from Lisbon (LIS) to Dulles Intl (IAD)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — IAD
Feb 23 — Mar 21
Mon 2/23
Mon 3/2
1 adult, Economy
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Cheap flight deals from Lisbon to Dulles Intl

Cheapest flights from Lisbon to Dulles Intl
Explore the most affordable flight options available from Lisbon to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 24, 2026.

This lol.travel deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/2911:25 am
LIS
-
IAD
Nonstop8h 50m
TAP AIR PORTUGAL
Wed 2/410:30 pm
IAD
-
LIS
Nonstop7h 05m
TAP AIR PORTUGAL
Deal found 1/23$442
This oojo deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/1211:25 am
LIS
-
IAD
Nonstop8h 50m
TAP AIR PORTUGAL
Thu 3/196:30 pm
IAD
-
LIS
Nonstop7h 05m
TAP AIR PORTUGAL
Deal found 1/22$454
This FlightHub deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/1710:45 am
LIS
-
IAD
Nonstop8h 50m
TAP AIR PORTUGAL
Mon 3/236:30 pm
IAD
-
LIS
Nonstop7h 05m
TAP AIR PORTUGAL
Deal found 1/23$455
This Kiwi.com deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/205:00 am
LIS
-
IAD
1 stop14h 35m
Lufthansa
Sat 2/2810:05 pm
IAD
-
LIS
Nonstop7h 10m
Lufthansa
Deal found 1/23$457
This Lufthansa deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/205:00 am
LIS
-
IAD
1 stop14h 35m
Multiple Airlines
Sat 2/288:30 pm
IAD
-
LIS
1 stop13h 05m
Multiple Airlines
Deal found 1/23$462
This TAP AIR PORTUGAL deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/235:15 pm
LIS
-
IAD
Nonstop8h 45m
TAP AIR PORTUGAL
Sun 2/110:30 pm
IAD
-
LIS
Nonstop7h 05m
TAP AIR PORTUGAL
Deal found 1/22$467
This United Airlines deal was found by Cheapflights users on 1/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/76:15 am
LIS
-
IAD
1 stop18h 10m
United Airlines
Sun 4/2610:30 pm
IAD
-
LIS
Nonstop7h 00m
United Airlines
Deal found 1/24$475
This Air Canada deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/205:00 am
LIS
-
IAD
2 stops15h 49m
Air Canada
Sat 2/284:30 pm
IAD
-
LIS
2 stops15h 50m
Air Canada
Deal found 1/23$482
This FlightHub deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/175:55 pm
LIS
-
IAD
1 stop29h 50m
Royal Air Maroc
Sun 3/229:45 pm
IAD
-
LIS
1 stop15h 10m
Royal Air Maroc
Deal found 1/23$513
This Priceline deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/126:30 am
LIS
-
IAD
1 stop15h 00m
Multiple Airlines
Thu 3/197:20 pm
IAD
-
LIS
1 stop15h 25m
Multiple Airlines
Deal found 1/22$516

Find flight deals from Lisbon to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Lisbon (LIS) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
1 star

Round-trip from

$454
(oojo)

One-way from

$363
(Travelocity)

Popular in

July

Cheapest in

December

Average price

$747

Good round-trip deal

$653 or less

Good one-way deal

$636 or less
Provider with most accurate pricing for Lisbon Humberto Delgado-Washington, D.C. Dulles Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lisbon Humberto Delgado-Washington, D.C. Dulles Intl flights.
Search Deals
From Lisbon Humberto Delgado to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Lisbon Humberto Delgado to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($82 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($25 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Lisbon Humberto Delgado to Washington, D.C. Dulles Intl.
Search Deals
Price to beat on a one-way flight from Lisbon Humberto Delgado to Washington, D.C. Dulles Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Lisbon to Dulles Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 24, 2026.
Use the filters below to find and compare flights from Lisbon to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Lisbon

Fly to

Dulles Intl

Route

Depart

Return

Price

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Tue 4/7

6:15 am-7:25 pm

1 stop18h 10m

Washington, D.C. Dulles Intl

Sun 4/26

10:30 pm-10:30 am

Nonstop7h 00m

$475

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Tue 3/17

5:00 am-5:05 pm

1 stop16h 05m

Washington, D.C. Dulles Intl

Mon 3/23

7:50 pm-11:20 am

1 stop11h 30m

$525

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Mon 3/16

5:00 am-5:05 pm

1 stop16h 05m

Washington, D.C. Dulles Intl

Mon 3/23

10:40 pm-10:25 pm

1 stop19h 45m

$525

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Wed 3/18

12:55 pm-4:35 pm

1 stop31h 40m

Washington, D.C. Dulles Intl

Mon 3/23

7:20 pm-6:55 pm

1 stop19h 35m

$531

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Mon 3/16

11:25 am-5:05 pm

1 stop33h 40m

Washington, D.C. Dulles Intl

Tue 3/24

7:05 pm-6:50 pm

1 stop19h 45m

$531

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Thu 3/12

5:00 am-7:19 pm

2 stops18h 19m

Washington, D.C. Dulles Intl

Thu 3/19

1:19 pm-10:35 am

2 stops17h 16m

$537

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Sun 3/29

7:45 pm-3:35 pm

1 stop24h 50m

Washington, D.C. Dulles Intl

Sun 4/5

5:40 pm-10:50 pm

1 stop24h 10m

$537

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Sun 3/15

6:30 pm-8:45 pm

1 stop30h 15m

Washington, D.C. Dulles Intl

Mon 3/23

7:50 pm-3:10 pm

1 stop15h 20m

$542

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Sun 3/15

6:40 pm-4:35 pm

1 stop25h 55m

Washington, D.C. Dulles Intl

Tue 3/24

10:45 pm-5:40 pm

1 stop14h 55m

$548

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Sat 3/14

6:40 pm-8:55 pm

1 stop30h 15m

Washington, D.C. Dulles Intl

Tue 3/24

10:45 pm-9:45 pm

1 stop19h 00m

$548

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/23

Showing 1-10 of 20 results
1
2
  • Most accurate provider: When it comes to deals on Lisbon-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Lisbon-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Lisbon-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Lisbon-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Lisbon-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Lisbon to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Lisbon with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Lisbon to Washington, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from Lisbon to Washington, D.C. Dulles Intl Airport?

Currently, December is the cheapest month in which you can book a flight from Lisbon to Washington, D.C. Dulles Intl Airport (average of $485). Flying from Lisbon to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $688). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LIS to IAD?

Find hourly flight availability from Lisbon to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 24, 2026.

When flying from Lisbon to Washington, D.C. Dulles Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from Lisbon to Washington, D.C. Dulles Intl Airport?

The best insider tips for Lisbon to Washington, D.C. Dulles Intl Airport flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Lisbon to Washington, D.C. Dulles Intl Airport trip
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on LIS and IAD

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Dulles Intl. Reviews last updated January 24, 2026.
Peruse reviews from past customers who have flown with United Airlines and TAP AIR PORTUGAL from Lisbon to Washington, D.C. Dulles Intl Airport to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,193 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Crew

8.1

Food

6.6

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,193 reviews
United Airlines
7.4
Good
9,193 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Crew

8.1

Food

6.6

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
TAP AIR PORTUGAL
7.1
Good
2,127 reviews
United Airlines
7.4
Good
9,193 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Crew

8.1

Food

6.6

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Related info for your journey

Find useful and relevant information for your journey from Lisbon to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Lisbon to Washington, D.C. Dulles Intl?

    Most people fly from Lisbon Humberto Delgado (LIS) if they book a flight from Lisbon to Washington, D.C. Dulles Intl. On average, Humberto Delgado has 1 outbound flight to Washington, D.C. Dulles Intl per day from 2 airlines. Lisbon Humberto Delgado is conveniently located just 4.2 mi from Lisbon’s city center.

  • How long is the flight from Lisbon to Washington, D.C. Dulles Intl Airport?

    There are many flights that can get you from Lisbon to Washington, D.C. Dulles Intl Airport in 18h 10m. Fly via United Airlines or British Airways to get the fastest option. The distance from Lisbon to Washington, D.C. Dulles Intl Airport is about 3580 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Lisbon to Washington, D.C. Dulles Intl Airport round-trip?

    Cheapflights users have booked flights from Lisbon to Washington, D.C. Dulles Intl Airport round-trip from $497. Another airline that can offer you cheap pricing is TAP AIR PORTUGAL. United Airlines is priced at 33% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Lisbon to Washington, D.C. Dulles Intl Airport one-way?

    To fly one-way, consider booking your trip with TAP AIR PORTUGAL, which is currently one of the cheapest options available, starting at $365. JetBlue flights start at $395 while deals on Aer Lingus start at $398 one-way.

  • What are the most reliable airlines from Lisbon to Washington, D.C. Dulles Intl Airport?

    Consider Air Canada (69%), United Airlines (69%) or Lufthansa (69%) when booking your flight. These represent the most reliable airlines when flying from Lisbon to Washington, D.C. Dulles Intl Airport.

  • What are the cheapest flights from Lisbon to Washington, D.C. Dulles Intl Airport?

    Looking for the cheapest flight from Lisbon to Washington, D.C. Dulles Intl Airport? While on average our users pay $782, our data indicates the cheapest price to be $494. The most popular route (Lisbon Humberto Delgado - Washington, D.C. Dulles Intl), is priced around $454.

  • Can I find deals for flights from Lisbon to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Lisbon to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Lisbon to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Lisbon to Dulles Intl.

  • Can I find deals for business class flights from Lisbon to Dulles Intl?

    Yes. Cheapflights offers flight deals from Lisbon to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Lisbon to Washington, D.C. Dulles Intl Airport?

    Currently, December is the cheapest month in which you can book a flight from Lisbon to Washington, D.C. Dulles Intl Airport (average of $485). Flying from Lisbon to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $688). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Alexandria
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Silver Spring
Hanover
Herndon
Fredericksburg
Linthicum Heights
Rockville
Laurel
Towson
Manassas
Largo
Bowie
McLean
Clinton
Upper Marlboro

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Alternative routes for Lisbon to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Lisbon to Reagan-National flights
Lisbon to Baltimore flights
Porto to Reagan-National flights
Porto to Dulles Intl flights
Porto to Baltimore flights

Top 2 airlines flying from Lisbon to Dulles Intl

Discover the top 2 airlines that operate flights from Lisbon to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$497Average$726FlexibilityNo cancel feeOn-time69%
TAP AIR PORTUGALCheapest$561Average$720FlexibilityNo cancel feeOn-timeN/A

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