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Dulles Intl

$376+ 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 5/18. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — IAD
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
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Cheapflights Tip: The best prices from Lisbon Humberto Delgado to Washington, D.C. Dulles Intl are usually found in November or March, booked 82 days in advance, depart on a Friday or Wednesday and return on a Tuesday

Cheap 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 April 17, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$522
(British Airways)

One-way from

$376
(Ovago)

Popular in

July

Cheapest in

November

Average price

$653

Good round-trip deal

$472 or less

Good one-way deal

$564 or less
Provider with most accurate pricing for Lisbon Humberto Delgado-Washington, D.C. Dulles Intl flight deals.
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Provider most trusted by Cheapflights users for Lisbon Humberto Delgado-Washington, D.C. Dulles Intl flights.
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From Lisbon Humberto Delgado to Washington, D.C. Dulles Intl
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One-way flight from Lisbon Humberto Delgado to Washington, D.C. Dulles Intl
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Highest demand for flights based on searches. 12% potential increase in price ($106 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Lisbon Humberto Delgado to Washington, D.C. Dulles Intl.
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Price to beat on a one-way flight from Lisbon Humberto Delgado to Washington, D.C. Dulles Intl.
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Find 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 April 17, 2025.

This British Airways deal was found by Cheapflights users on 4/16. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/28:25 amLIS - IAD
1 stop11h 35mMultiple Airlines
Tue 5/610:40 pmIAD - LIS
1 stop14h 15mMultiple Airlines
Deal found 4/16$522
This Expedia deal was found by Cheapflights users on 4/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/96:35 amLIS - IAD
1 stop13h 25mBritish Airways
Sun 5/2510:40 pmIAD - LIS
1 stop19h 25mBritish Airways
Deal found 4/17$525
This Delta deal was found by Cheapflights users on 4/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/25:00 amLIS - IAD
1 stop15h 35mDelta
Tue 5/68:33 pmIAD - LIS
2 stops16h 17mDelta
Deal found 4/16$531
This KLM deal was found by Cheapflights users on 4/17. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/177:30 pmLIS - IAD
1 stop25h 05mKLM
Mon 6/212:20 pmIAD - LIS
1 stop14h 40mKLM
Deal found 4/17$537
This Expedia deal was found by Cheapflights users on 4/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/286:45 amLIS - IAD
1 stop14h 05mLufthansa
Mon 6/210:15 pmIAD - LIS
Nonstop7h 15mLufthansa
Deal found 4/16$559
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Fri 5/96:15 amLIS - IAD
1 stop13h 45mUnited Airlines
Sun 5/259:00 amIAD - LIS
1 stop18h 20mUnited Airlines
Deal found 4/16$570
This Virgin Atlantic deal was found by Cheapflights users on 4/17. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1710:00 amLIS - IAD
2 stops17h 54mVirgin Atlantic
Mon 6/29:40 amIAD - LIS
2 stops20h 05mVirgin Atlantic
Deal found 4/17$586
This Finnair deal was found by Cheapflights users on 4/17. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/96:35 amLIS - IAD
1 stop13h 25mFinnair
Sun 5/254:35 pmIAD - LIS
1 stop25h 50mFinnair
Deal found 4/17$591
This American Airlines deal was found by Cheapflights users on 4/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/156:35 amLIS - IAD
1 stop13h 25mAmerican Airlines
Thu 5/2210:40 pmIAD - LIS
1 stop11h 45mAmerican Airlines
Deal found 4/16$602
This Gotogate deal was found by Cheapflights users on 4/16. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/212:00 pmLIS - IAD
Nonstop8h 20mTAP AIR PORTUGAL
Tue 5/610:20 pmIAD - LIS
Nonstop7h 20mTAP AIR PORTUGAL
Deal found 4/16$604
This SWISS deal was found by Cheapflights users on 4/16. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/95:55 amLIS - IAD
2 stops18h 55mSWISS
Sun 5/258:45 pmIAD - LIS
1 stop21h 35mSWISS
Deal found 4/16$613
This Air France deal was found by Cheapflights users on 4/17. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/229:50 amLIS - IAD
1 stop14h 25mAir France
Sun 4/279:20 pmIAD - LIS
1 stop12h 30mAir France
Deal found 4/17$658

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 April 17, 2025.
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

Fri 5/2

8:25 am-3:00 pm

1 stop11h 35m

Washington, D.C. Dulles Intl

Tue 5/6

10:40 pm-5:55 pm

1 stop14h 15m

$522

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Fri 5/9

6:35 am-3:00 pm

1 stop13h 25m

Washington, D.C. Dulles Intl

Sun 5/25

10:40 pm-11:05 pm

1 stop19h 25m

$525

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Fri 5/2

5:00 am-3:35 pm

1 stop15h 35m

Washington, D.C. Dulles Intl

Tue 5/6

8:33 pm-5:50 pm

2 stops16h 17m

$531

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Sat 5/17

7:30 pm-3:35 pm

1 stop25h 05m

Washington, D.C. Dulles Intl

Mon 6/2

12:20 pm-8:00 am

1 stop14h 40m

$537

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Wed 5/28

6:45 am-3:50 pm

1 stop14h 05m

Washington, D.C. Dulles Intl

Mon 6/2

10:15 pm-10:30 am

Nonstop7h 15m

$559

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Fri 5/9

6:15 am-3:00 pm

1 stop13h 45m

Washington, D.C. Dulles Intl

Sun 5/25

9:00 am-8:20 am

1 stop18h 20m

$570

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Sat 5/17

10:00 am-10:54 pm

2 stops17h 54m

Washington, D.C. Dulles Intl

Mon 6/2

9:40 am-10:45 am

2 stops20h 05m

$586

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Fri 5/9

6:35 am-3:00 pm

1 stop13h 25m

Washington, D.C. Dulles Intl

Sun 5/25

4:35 pm-11:25 pm

1 stop25h 50m

$591

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Thu 5/15

6:35 am-3:00 pm

1 stop13h 25m

Washington, D.C. Dulles Intl

Thu 5/22

10:40 pm-3:25 pm

1 stop11h 45m

$602

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Fri 5/2

12:00 pm-3:20 pm

Nonstop8h 20m

Washington, D.C. Dulles Intl

Tue 5/6

10:20 pm-10:40 am

Nonstop7h 20m

$604

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 28 results
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Compare providers for flights from Lisbon to Dulles Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Lisbon to Dulles Intl in April.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Lisbon-Washington, D.C. Dulles Intl Airport flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Lisbon-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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

How far ahead should I book a flight from Lisbon to Washington, D.C. Dulles Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from Lisbon to Dulles Intl. Price data was last updated on April 11, 2025.

To ensure you get the cheapest price possible for a flight from Lisbon to Washington, D.C. Dulles Intl Airport, you should look to book at least 81 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, August is the cheapest month in which you can book a flight from Lisbon to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Lisbon to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $383). 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 April 17, 2025.

It’s typically best to fly out from Lisbon to Washington, D.C. Dulles Intl Airport in the afternoon. Doing so could potentially save you 29% on the flight price compared to flying at noon, which is usually more expensive.

Rainfall in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

Temperature in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

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 April 17, 2025.
See what other customers who have flown with Delta, KLM and Finnair from Lisbon to Washington, D.C. have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,916 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,916 reviews
Delta
8.0
Very good
7,916 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,327 reviews
Delta
8.0
Very good
7,916 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Finnair
7.6
Good
1,269 reviews
Delta
8.0
Very good
7,916 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Austrian Airlines
7.6
Good
775 reviews
Delta
8.0
Very good
7,916 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
SWISS
7.5
Good
1,580 reviews
Delta
8.0
Very good
7,916 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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 4 outbound flights to Washington, D.C. Dulles Intl per day from 3 airlines. Lisbon Humberto Delgado is conveniently located just 4.2 mi from Lisbon’s city center.

  • 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 $525. Other airlines that can offer you cheap pricing are Delta, from $531, and KLM, from $537. British Airways is priced at 27% 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 $376. Aer Lingus flights start at $456 while deals on Royal Air Maroc start at $502 one-way.

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

    Consider Air Canada (72%), United Airlines (72%) or Lufthansa (72%) 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 $1,329, our data indicates the cheapest price to be $344. The most popular route (Lisbon Humberto Delgado - Washington, D.C. Dulles Intl), is priced around $522.

  • 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, August is the cheapest month in which you can book a flight from Lisbon to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Lisbon to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $383). 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 Lisbon?

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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 Baltimore flights
Lisbon to Reagan-National flights
Porto to Dulles Intl flights
Porto to Baltimore flights
Porto to Reagan-National flights

Top 3 airlines flying from Lisbon to Dulles Intl

Discover the top 3 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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$536Average$779FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$541Average$730FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$543Average$645FlexibilityNo cancel feeOn-time69%

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