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Dulles Intl

$372+ 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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — IAD
may. 4 — may. 111
dom. 5/4
dom. 5/11
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 abril 29, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$524
(British Airways)

One-way from

$372
(Kiwi.com)

Popular in

July

Cheapest in

November

Average price

$653

Good round-trip deal

$516 or less

Good one-way deal

$539 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. 13% potential increase in price ($110 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 abril 29, 2025.

This British Airways deal was found by Cheapflights users on 4/28. 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.
vie. 5/96:35 amLIS - IAD
1 stop13h 25mMultiple Airlines
jue. 5/1510:40 pmIAD - LIS
1 stop19h 25mMultiple Airlines
Deal found 4/28$524
This Delta deal was found by Cheapflights users on 4/28. 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.
vie. 5/95:00 amLIS - IAD
1 stop15h 35mDelta
dom. 5/259:20 pmIAD - LIS
1 stop12h 30mDelta
Deal found 4/28$533
This Booking.com deal was found by Cheapflights users on 4/28. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 6/97:15 amLIS - IAD
1 stop13h 35mBritish Airways
lun. 6/2310:40 pmIAD - LIS
1 stop19h 30mBritish Airways
Deal found 4/28$536
This Air France deal was found by Cheapflights users on 4/28. 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.
dom. 5/1110:00 amLIS - IAD
1 stop14h 39mAir France
lun. 5/269:20 pmIAD - LIS
1 stop12h 30mAir France
Deal found 4/28$549
This Virgin Atlantic deal was found by Cheapflights users on 4/28. 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.
dom. 5/1110:00 amLIS - IAD
2 stops19h 28mVirgin Atlantic
lun. 5/266:00 amIAD - LIS
2 stops23h 45mVirgin Atlantic
Deal found 4/28$555
This Expedia deal was found by Cheapflights users on 4/28. 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.
dom. 6/85:55 amLIS - IAD
1 stop15h 20mSWISS
lun. 6/168:45 pmIAD - LIS
1 stop21h 35mSWISS
Deal found 4/28$570
This United Airlines deal was found by Cheapflights users on 4/28. 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.
sáb. 5/1012:55 pmLIS - IAD
1 stop13h 30mUnited Airlines
lun. 5/2610:15 pmIAD - LIS
Nonstop7h 15mUnited Airlines
Deal found 4/28$580
This American Airlines deal was found by Cheapflights users on 4/28. 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.
vie. 5/96:35 amLIS - IAD
1 stop13h 25mAmerican Airlines
vie. 5/2310:40 pmIAD - LIS
1 stop14h 25mAmerican Airlines
Deal found 4/28$603
This Lufthansa deal was found by Cheapflights users on 4/28. 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.
dom. 5/1812:20 pmLIS - IAD
Nonstop8h 25mLufthansa
jue. 8/710:15 pmIAD - LIS
Nonstop7h 15mLufthansa
Deal found 4/28$637
This Austrian Airlines deal was found by Cheapflights users on 4/28. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 6/86:15 amLIS - IAD
2 stops37h 20mAustrian Airlines
lun. 6/165:25 pmIAD - LIS
2 stops25h 05mAustrian Airlines
Deal found 4/28$662
This TAP AIR PORTUGAL deal was found by Cheapflights users on 4/28. 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.
mar. 7/2912:00 pmLIS - IAD
Nonstop8h 20mTAP AIR PORTUGAL
mié. 8/1310:20 pmIAD - LIS
Nonstop7h 20mTAP AIR PORTUGAL
Deal found 4/28$815
This Air Canada deal was found by Cheapflights users on 4/28. 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.
lun. 7/2812:50 pmLIS - IAD
1 stop25h 47mAir Canada
vie. 8/18:18 amIAD - LIS
2 stops19h 02mAir Canada
Deal found 4/28$864

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 abril 29, 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

vie. 5/9

6:35 am-3:00 pm

1 stop13h 25m

Washington, D.C. Dulles Intl

jue. 5/15

10:40 pm-11:05 pm

1 stop19h 25m

$524

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

vie. 5/9

5:00 am-3:35 pm

1 stop15h 35m

Washington, D.C. Dulles Intl

dom. 5/25

9:20 pm-2:50 pm

1 stop12h 30m

$533

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

lun. 6/9

7:15 am-3:50 pm

1 stop13h 35m

Washington, D.C. Dulles Intl

lun. 6/23

10:40 pm-11:10 pm

1 stop19h 30m

$536

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

dom. 5/11

10:00 am-7:39 pm

1 stop14h 39m

Washington, D.C. Dulles Intl

lun. 5/26

9:20 pm-2:50 pm

1 stop12h 30m

$549

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

dom. 5/11

10:00 am-12:28 am

2 stops19h 28m

Washington, D.C. Dulles Intl

lun. 5/26

6:00 am-10:45 am

2 stops23h 45m

$555

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

dom. 6/8

5:55 am-4:15 pm

1 stop15h 20m

Washington, D.C. Dulles Intl

lun. 6/16

8:45 pm-11:20 pm

1 stop21h 35m

$570

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

sáb. 5/10

12:55 pm-9:25 pm

1 stop13h 30m

Washington, D.C. Dulles Intl

lun. 5/26

10:15 pm-10:30 am

Nonstop7h 15m

$580

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

vie. 5/9

6:35 am-3:00 pm

1 stop13h 25m

Washington, D.C. Dulles Intl

vie. 5/23

10:40 pm-6:05 pm

1 stop14h 25m

$603

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

dom. 5/18

12:20 pm-3:45 pm

Nonstop8h 25m

Washington, D.C. Dulles Intl

jue. 8/7

10:15 pm-10:30 am

Nonstop7h 15m

$637

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

dom. 6/8

6:15 am-2:35 pm

2 stops37h 20m

Washington, D.C. Dulles Intl

lun. 6/16

5:25 pm-11:30 pm

2 stops25h 05m

$662

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 34 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 Accuracy2 starsTrust 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 25, 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 $373). 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 abril 29, 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.

Weekly flight availability from Lisbon to Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from Lisbon to Dulles Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated abril 29, 2025.

The most flights from LIS to IAD are scheduled on a Thursday (7 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (5 on average).

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 abril 29, 2025.
See what other customers who have flown with Delta, Finnair and Austrian Airlines 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
7,929 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

8.0

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
7,929 reviews
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

8.0

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
1,273 reviews
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

8.0

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
780 reviews
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

8.0

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
1,587 reviews
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

8.0

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
Cathay Pacific
7.5
Good
852 reviews
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

8.0

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 5 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 $533. Other airlines that can offer you cheap pricing are British Airways, from $536, and Air France, from $549. Delta is priced at 26% 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 $404. Aer Lingus flights start at $449 while deals on Royal Air Maroc start at $504 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 $1,269, our data indicates the cheapest price to be $348. The most popular route (Lisbon Humberto Delgado - Washington, D.C. Dulles Intl), is priced around $524.

  • 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 $373). 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?

Book flights to Lisbon if you plan to visit one of these locations
Arlington
Alexandria
Woodbridge
Fairfax
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Fredericksburg
Gaithersburg
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Linthicum Heights
Falls Church
Laurel
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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 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 abril 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$534Average$635FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$536Average$779FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$541Average$734FlexibilityNo cancel feeOn-timeN/A

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