Dulles Intl

$353+ Cheap flights from Portugal 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 5/28. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — IAD
Feb 25 — Mar 41
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Cheap flight deals from Portugal to Dulles Intl

Keep the following information in mind while searching for Portugal to Dulles Intl flight deals. Data was last updated February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$486
(Expedia)

One-way from

$353
(Kiwi.com)

Popular in

July

Cheapest in

September

Average price

$581

Good round-trip deal

$604 or less

Good one-way deal

$568 or less
Provider with most accurate pricing for Lisbon Humberto Delgado-Washington, D.C. (WAS) flight deals.
Provider most trusted by Cheapflights users for Lisbon Humberto Delgado-Washington, D.C. (WAS) flights.
From Portugal to Washington, D.C. Dulles Intl
One-way flight from Portugal to Washington, D.C. Dulles Intl
Highest demand for flights based on searches. 16% potential increase in price ($136 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
Average for round-trip flights in February 2025
Price to beat on a round-trip flight from Portugal to Washington, D.C. Dulles Intl.
Price to beat on a one-way flight from Portugal to Washington, D.C. Dulles Intl.

Find flight deals from Portugal to Dulles Intl

Cheapest flights from Portugal to Dulles Intl
Explore the most affordable flight options available from Portugal to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 20, 2025.

This Finnair deal was found by Cheapflights users on 2/19. 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.
Thu 5/86:35 amLIS - IAD
1 stop13h 25mFinnair
Mon 5/1210:40 pmIAD - LIS
1 stop19h 30mFinnair
Deal found 2/19$478
This Expedia deal was found by Cheapflights users on 2/20. 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.
Thu 3/610:50 amLIS - IAD
1 stop13h 25mAer Lingus
Sat 3/299:45 pmIAD - LIS
1 stop18h 50mAer Lingus
Deal found 2/20$486
This American Airlines deal was found by Cheapflights users on 2/19. 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 5/18:25 amLIS - IAD
1 stop11h 35mAmerican Airlines
Sat 5/1010:45 pmIAD - LIS
1 stop19h 25mAmerican Airlines
Deal found 2/19$487
This Iberia deal was found by Cheapflights users on 2/20. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/138:15 amOPO - IAD
1 stop11h 45mMultiple Airlines
Sun 4/2710:40 pmIAD - OPO
1 stop16h 45mMultiple Airlines
Deal found 2/20$488
This Finnair deal was found by Cheapflights users on 2/20. 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.
Wed 3/57:05 amLIS - IAD
1 stop13h 30mMultiple Airlines
Tue 3/1810:55 pmIAD - LIS
1 stop14h 50mMultiple Airlines
Deal found 2/20$492
This Booking.com deal was found by Cheapflights users on 2/19. 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.
Fri 2/2810:45 amLIS - IAD
1 stop14h 00mBritish Airways
Sun 3/1610:55 pmIAD - LIS
1 stop18h 50mBritish Airways
Deal found 2/19$496
This British Airways deal was found by Cheapflights users on 2/20. 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.
Sat 4/128:35 pmOPO - IAD
1 stop23h 25mIberia
Sat 4/194:35 pmIAD - OPO
1 stop10h 00mIberia
Deal found 2/20$512
This Delta deal was found by Cheapflights users on 2/20. 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 3/145:00 amLIS - IAD
2 stops18h 19mDelta
Sun 3/309:20 pmIAD - LIS
1 stop12h 30mDelta
Deal found 2/20$514
This Lufthansa deal was found by Cheapflights users on 2/20. 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.
Mon 3/3111:05 amOPO - IAD
1 stop13h 20mLufthansa
Thu 5/1510:20 pmIAD - OPO
1 stop20h 00mLufthansa
Deal found 2/20$541
This Mytrip deal was found by Cheapflights users on 2/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/145:00 amLIS - IAD
1 stop15h 50mLufthansa
Sun 3/3010:15 pmIAD - LIS
Nonstop7h 15mLufthansa
Deal found 2/20$542
This United Airlines deal was found by Cheapflights users on 2/20. 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.
Wed 5/286:00 amOPO - IAD
1 stop14h 15mUnited Airlines
Sat 12/133:00 pmIAD - OPO
2 stops19h 15mUnited Airlines
Deal found 2/20$544
This KLM deal was found by Cheapflights users on 2/20. 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.
Thu 2/273:25 pmLIS - IAD
1 stop29h 20mKLM
Wed 3/55:35 pmIAD - LIS
1 stop16h 00mKLM
Deal found 2/20$550

Find flights from Portugal to Dulles Intl within your budget

Customize your flight search to find flights from Portugal 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 February 20, 2025.

Fly from

Portugal

Fly to

Dulles Intl

Route

Depart

Return

Price

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Thu 3/6

10:50 am-7:15 pm

1 stop13h 25m

Washington, D.C. Dulles Intl

Sat 3/29

9:45 pm-9:35 pm

1 stop18h 50m

$486

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Thu 4/17

8:25 am-3:00 pm

1 stop11h 35m

Washington, D.C. Dulles Intl

Mon 4/28

7:25 pm-12:45 pm

1 stop12h 20m

$487

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sun 4/13

8:15 am-3:00 pm

1 stop11h 45m

Washington, D.C. Dulles Intl

Sun 4/27

10:40 pm-8:25 pm

1 stop16h 45m

$488

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Thu 3/6

6:30 am-7:45 pm

2 stops18h 15m

Washington, D.C. Dulles Intl

Sat 3/29

10:45 pm-11:10 pm

1 stop19h 25m

$495

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Fri 3/7

10:45 am-7:45 pm

1 stop14h 00m

Washington, D.C. Dulles Intl

Sun 3/23

7:00 pm-12:10 pm

1 stop13h 10m

$496

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Wed 3/5

5:00 am-3:45 pm

1 stop15h 45m

Washington, D.C. Dulles Intl

Mon 3/10

10:30 pm-3:10 pm

1 stop12h 40m

$508

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sat 4/12

8:35 pm-3:00 pm

1 stop23h 25m

Washington, D.C. Dulles Intl

Sat 4/19

4:35 pm-7:35 am

1 stop10h 00m

$512

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 3/31

11:05 am-7:25 pm

1 stop13h 20m

Washington, D.C. Dulles Intl

Thu 5/15

10:20 pm-11:20 pm

1 stop20h 00m

$541

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Fri 3/14

5:00 am-4:50 pm

1 stop15h 50m

Washington, D.C. Dulles Intl

Sun 3/30

10:15 pm-10:30 am

Nonstop7h 15m

$542

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 5/28

6:00 am-3:15 pm

1 stop14h 15m

Washington, D.C. Dulles Intl

Sat 12/13

3:00 pm-3:15 pm

2 stops19h 15m

$544

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 52 results
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Best time to book a flight from Portugal to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Portugal 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.

Travel insights for flights from Portugal to Dulles Intl

Get recent, data-driven insights about flights from Portugal to Dulles Intl including ideal travel times, pricing trends, and more.

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

Currently, August is the cheapest month in which you can book a flight from Portugal to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Portugal to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $389). 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 PT to IAD?

Find hourly flight availability from Portugal 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 February 20, 2025.

When flying from Portugal to Washington, D.C. Dulles Intl Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 18% versus a flight at noon.

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 February 20, 2025.
See what other customers who have flown with Delta, KLM and Finnair from Portugal to Washington, D.C. have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
8.0
Very good

Crew

8.5

Boarding

8.2

Comfort

8.0

Food

7.3

Overall

8.0

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

8.0
Very good
8.0
Very good

Crew

8.5

Boarding

8.2

Comfort

8.0

Food

7.3

Overall

8.0

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

8.0
Very good

Crew

8.5

Boarding

8.2

Comfort

8.0

Food

7.3

Overall

8.0

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

8.0
Very good

Crew

8.5

Boarding

8.2

Comfort

8.0

Food

7.3

Overall

8.0

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

8.0
Very good

Crew

8.5

Boarding

8.2

Comfort

8.0

Food

7.3

Overall

8.0

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

8.0
Very good

Crew

8.5

Boarding

8.2

Comfort

8.0

Food

7.3

Overall

8.0

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

    The cheapest airlines for a one-way flight from Portugal to Washington, D.C. Dulles Intl Airport are Royal Air Maroc ($358), Aer Lingus ($439), and Finnair ($479).

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

    Consider Air Canada (91%), United Airlines (91%) or Lufthansa (91%) when booking your flight. These represent the most reliable airlines when flying from Portugal to Washington, D.C. Dulles Intl Airport.

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

    The cheapest flight price from Portugal to Washington, D.C. Dulles Intl Airport is $496. On average you can expect to pay $1,231. The most popular route, (Lisbon Humberto Delgado - Washington, D.C. Dulles Intl), can usually be booked for $478.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Portugal 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 Portugal to Washington, D.C. Dulles Intl Airport?

    Currently, August is the cheapest month in which you can book a flight from Portugal to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Portugal to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $389). 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 Portugal?

Book flights to Portugal if you plan to visit one of these locations
Arlington
Alexandria
Fairfax
Springfield
Rockville
Tysons
Gaithersburg
Silver Spring
Fredericksburg
Linthicum Heights
Laurel
Falls Church
Woodbridge
Sterling
Easton
Herndon
Bowie
Reston
National Harbor
Oxon Hill

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Alternative routes for Portugal to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.

Top 3 airlines flying from Portugal to Dulles Intl

Discover the top 3 airlines that operate flights from Portugal 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$480Average$777FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$536Average$779FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$543Average$726FlexibilityNo cancel feeOn-time69%
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