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Dulles Intl

$339+ 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 12/18. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — IAD
nov. 29 — dic. 61
sáb. 11/29
sáb. 12/6
1 adult, Economy
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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 octubre 30, 2025.

This Rumbo deal was found by Cheapflights users on 10/29. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/215:35 pmOPO - IAD
1 stop30h 15mScandinavian Airlines
jue. 12/48:30 pmIAD - OPO
1 stop15h 25mScandinavian Airlines
Deal found 10/29$519
This lol.travel deal was found by Cheapflights users on 10/28. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/411:25 amLIS - IAD
Nonstop8h 50mTAP AIR PORTUGAL
mar. 12/95:30 pmIAD - LIS
Nonstop7h 05mTAP AIR PORTUGAL
Deal found 10/28$558
This KLM deal was found by Cheapflights users on 10/29. 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.
lun. 11/246:30 amOPO - IAD
1 stop14h 35mKLM
lun. 12/16:50 pmIAD - OPO
1 stop10h 40mKLM
Deal found 10/29$572
This Delta deal was found by Cheapflights users on 10/29. 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.
lun. 11/246:30 amOPO - IAD
1 stop14h 35mDelta
lun. 12/16:50 pmIAD - OPO
1 stop10h 40mDelta
Deal found 10/29$573
This Air France deal was found by Cheapflights users on 10/27. 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.
sáb. 11/85:00 amLIS - IAD
1 stop16h 05mMultiple Airlines
sáb. 11/156:50 pmIAD - LIS
1 stop15h 20mMultiple Airlines
Deal found 10/27$576
This Delta deal was found by Cheapflights users on 10/28. 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.
dom. 11/95:00 amLIS - IAD
1 stop16h 05mDelta
lun. 11/246:50 pmIAD - LIS
1 stop11h 30mDelta
Deal found 10/28$578
This Delta deal was found by Cheapflights users on 10/29. 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.
sáb. 11/226:00 amOPO - IAD
2 stops18h 08mDelta
dom. 4/56:30 pmIAD - OPO
1 stop16h 00mDelta
Deal found 10/29$578
This Delta deal was found by Cheapflights users on 10/29. 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.
mié. 11/55:00 amLIS - IAD
1 stop16h 05mDelta
mié. 11/127:49 pmIAD - LIS
2 stops16h 41mDelta
Deal found 10/29$579
This Delta deal was found by Cheapflights users on 10/30. 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.
lun. 12/85:30 amLIS - IAD
1 stop16h 05mDelta
vie. 2/612:23 pmIAD - LIS
2 stops17h 57mDelta
Deal found 10/30$580
This Delta deal was found by Cheapflights users on 10/29. 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.
jue. 12/185:30 amLIS - IAD
1 stop16h 05mDelta
jue. 1/812:23 pmIAD - LIS
2 stops17h 57mDelta
Deal found 10/29$581
This Delta deal was found by Cheapflights users on 10/30. 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. 11/216:30 amOPO - IAD
1 stop14h 35mDelta
jue. 12/412:19 pmIAD - OPO
2 stops17h 11mDelta
Deal found 10/30$581
This Delta deal was found by Cheapflights users on 10/27. 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.
sáb. 11/85:00 amLIS - IAD
2 stops19h 18mDelta
sáb. 11/156:50 pmIAD - LIS
1 stop15h 20mDelta
Deal found 10/27$583

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 octubre 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$460
(Booking.com)

One-way from

$339
(Cheapflightsfares)

Popular in

July

Cheapest in

September

Average price

$830

Good round-trip deal

$799 or less

Good one-way deal

$831 or less
Provider with most accurate pricing for Lisbon Humberto Delgado-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lisbon Humberto Delgado-Washington, D.C. (WAS) flights.
Search Deals
From Portugal to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Portugal to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($94 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Portugal to Washington, D.C. Dulles Intl.
Search Deals
Price to beat on a one-way flight from Portugal to Washington, D.C. Dulles Intl.
Search Deals

Cheapflights Fare Finder

 
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 octubre 30, 2025.
Use the filters below to find and compare flights from Portugal to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Portugal

Fly to

Dulles Intl

Route

Depart

Return

Price

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

vie. 11/21

5:35 pm-6:50 pm

1 stop30h 15m

Washington, D.C. Dulles Intl

jue. 12/4

8:30 pm-4:55 pm

1 stop15h 25m

$519

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

dom. 1/25

4:55 pm-3:20 pm

1 stop27h 25m

Washington, D.C. Dulles Intl

jue. 1/29

8:30 pm-9:50 pm

2 stops20h 20m

$571

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

sáb. 11/22

6:00 am-4:05 pm

1 stop15h 05m

Washington, D.C. Dulles Intl

dom. 4/5

9:20 pm-3:30 pm

1 stop13h 10m

$572

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

lun. 11/24

6:30 am-4:05 pm

1 stop14h 35m

Washington, D.C. Dulles Intl

lun. 12/1

6:50 pm-10:30 am

1 stop10h 40m

$572

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

lun. 11/24

6:30 am-4:05 pm

1 stop14h 35m

Washington, D.C. Dulles Intl

lun. 12/1

6:50 pm-10:30 am

1 stop10h 40m

$573

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

lun. 2/2

5:00 am-4:05 pm

1 stop16h 05m

Washington, D.C. Dulles Intl

vie. 2/13

6:50 pm-11:20 am

1 stop11h 30m

$577

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

dom. 11/9

5:00 am-4:05 pm

1 stop16h 05m

Washington, D.C. Dulles Intl

lun. 11/24

6:50 pm-5:30 pm

1 stop17h 40m

$578

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

jue. 12/4

5:00 am-4:05 pm

1 stop16h 05m

Washington, D.C. Dulles Intl

mar. 12/9

7:59 pm-5:30 pm

2 stops16h 31m

$578

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

jue. 11/13

5:00 am-4:05 pm

1 stop16h 05m

Washington, D.C. Dulles Intl

vie. 11/28

7:49 pm-3:10 pm

2 stops14h 21m

$578

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

sáb. 11/22

6:00 am-7:08 pm

2 stops18h 08m

Washington, D.C. Dulles Intl

dom. 4/5

6:30 pm-3:30 pm

1 stop16h 00m

$578

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 35 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.

Cheapflights Insights

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

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

Currently, February is the cheapest month in which you can book a flight from Portugal to Washington, D.C. Dulles Intl Airport (average of $485). Flying from Portugal to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $695). 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 octubre 30, 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 evening, which can drop the price by up to 32% versus a flight in the morning.

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 octubre 30, 2025.
Read through reviews of airlines operating flights from Portugal to Washington, D.C. Dulles Intl Airport, such as United Airlines and TAP AIR PORTUGAL. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,998 reviews

Food

6.6

Crew

8.1

Comfort

7.3

Overall

7.4

Boarding

7.7

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
8,998 reviews
United Airlines
7.4
Good
8,998 reviews

Food

6.6

Crew

8.1

Comfort

7.3

Overall

7.4

Boarding

7.7

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
TAP AIR PORTUGAL
7.1
Good
2,037 reviews
United Airlines
7.4
Good
8,998 reviews

Food

6.6

Crew

8.1

Comfort

7.3

Overall

7.4

Boarding

7.7

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

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.

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

    Airlines like Scandinavian Airlines, KLM, and Delta fly from Portugal to Washington, D.C. Dulles Intl Airport in about 14h 35m. The time it takes to get you to your destination can typically vary by up to 15h 40m. Airlines will cover a distance of 3537 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 Iberia ($339), British Airways ($428), and Aer Lingus ($458).

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

    Consider Air Canada (74%), United Airlines (74%) or Lufthansa (74%) 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 $444. On average you can expect to pay $930. The most popular route, (Lisbon Humberto Delgado - Washington, D.C. Dulles Intl), can usually be booked for $514.

  • 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, February is the cheapest month in which you can book a flight from Portugal to Washington, D.C. Dulles Intl Airport (average of $485). Flying from Portugal to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $695). 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
Springfield
Hanover
Silver Spring
Fairfax
Fredericksburg
Falls Church
Owings Mills
Linthicum Heights
Manassas
Largo
Oxon Hill
Laurel
Towson
National Harbor
Waldorf
Bowie

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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.
Heathrow to Dulles Intl flights
Charles de Gaulle to Dulles Intl flights
Frankfurt to Dulles Intl flights
Heathrow to Baltimore flights
Orly to Dulles Intl flights
Charles de Gaulle to Baltimore flights
Bruxelles-National to Dulles Intl flights
Charles de Gaulle to Reagan-National flights
Heathrow to Reagan-National flights
Frankfurt to Baltimore flights
Gatwick to Dulles Intl flights
Frankfurt to Reagan-National flights
Gatwick to Baltimore flights
Amsterdam to Dulles Intl flights
London City to Dulles Intl flights
Gatwick to Reagan-National flights
Madrid to Dulles Intl flights
Vienna to Dulles Intl flights
Stansted to Dulles Intl flights
Barcelona-El Prat to Dulles Intl flights
Madrid to Baltimore flights
Leonardo da Vinci/Fiumicino to Dulles Intl flights
Munich to Dulles Intl flights
Bruxelles-National to Baltimore flights
Luton to Dulles Intl flights
Dublin to Dulles Intl flights
Istanbul to Dulles Intl flights
Frederic Chopin to Dulles Intl flights
Zurich to Dulles Intl flights
Madrid to Reagan-National flights
Amsterdam to Baltimore flights
Amsterdam to Reagan-National flights
Vienna to Reagan-National flights
Vienna to Baltimore flights
Geneva to Dulles Intl flights
Athens to Dulles Intl flights
Barcelona-El Prat to Baltimore flights
Barcelona-El Prat to Reagan-National flights
Luton to Baltimore flights
Frederic Chopin to Baltimore flights
Lisbon to Dulles Intl flights
Athens to Baltimore flights
Bruxelles-National to Reagan-National flights
Leonardo da Vinci/Fiumicino to Baltimore flights
London City to Reagan-National flights
Athens to Reagan-National flights

Top 2 airlines flying from Portugal to Dulles Intl

Discover the top 2 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 octubre 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$480Average$781FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$534Average$701FlexibilityNo cancel feeOn-time69%

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