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Dulles Intl

$358+ 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 3/24. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — IAD
ene. 16 — ene. 231
vie. 1/16
vie. 1/23
1 adult, Economy
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Cheap 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 diciembre 17, 2025.

This British Airways deal was found by Cheapflights users on 12/16. 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.
mié. 12/248:45 pmLIS - IAD
1 stop24h 45mMultiple Airlines
mar. 1/139:45 pmIAD - LIS
1 stop14h 55mMultiple Airlines
Deal found 12/16$623
This Flighttix deal was found by Cheapflights users on 12/16. 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 Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/2711:55 amLIS - IAD
Nonstop8h 35mLufthansa
dom. 1/410:05 pmIAD - LIS
Nonstop7h 10mLufthansa
Deal found 12/16$624
This United Airlines deal was found by Cheapflights users on 12/15. 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.
mar. 12/2311:55 amLIS - IAD
Nonstop8h 35mUnited Airlines
sáb. 1/310:05 pmIAD - LIS
Nonstop7h 10mUnited Airlines
Deal found 12/15$625
This United Airlines deal was found by Cheapflights users on 12/16. 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.
mié. 12/2411:00 amLIS - IAD
2 stops29h 47mUnited Airlines
mar. 1/135:38 pmIAD - LIS
1 stop9h 32mUnited Airlines
Deal found 12/16$633
This KLM deal was found by Cheapflights users on 12/15. 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.
jue. 12/185:00 amLIS - IAD
1 stop16h 05mMultiple Airlines
jue. 1/86:50 pmIAD - LIS
1 stop22h 35mMultiple Airlines
Deal found 12/15$711
This Ovago deal was found by Cheapflights users on 12/17. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/246:00 amOPO - IAD
1 stop19h 15mMultiple Airlines
sáb. 1/35:45 pmIAD - OPO
1 stop13h 20mMultiple Airlines
Deal found 12/17$883
This United Airlines deal was found by Cheapflights users on 12/16. 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.
mié. 12/246:00 amOPO - IAD
1 stop19h 15mUnited Airlines
sáb. 1/310:05 pmIAD - OPO
1 stop31h 30mUnited Airlines
Deal found 12/16$950
This American Airlines deal was found by Cheapflights users on 12/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/178:40 pmOPO - IAD
2 stops52h 15mMultiple Airlines
dom. 12/216:20 pmIAD - OPO
1 stop17h 20mMultiple Airlines
Deal found 12/17$1,070
This Cheapflightsfares deal was found by Cheapflights users on 12/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/244:15 pmOPO - IAD
2 stops27h 20mLufthansa
sáb. 1/36:10 pmIAD - OPO
2 stops23h 15mLufthansa
Deal found 12/17$1,080
This American Airlines deal was found by Cheapflights users on 12/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/178:40 pmOPO - IAD
2 stops52h 15mAmerican Airlines
dom. 12/216:20 pmIAD - OPO
2 stops32h 20mAmerican Airlines
Deal found 12/17$1,083
This Cheapflightsfares deal was found by Cheapflights users on 12/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/247:20 pmOPO - IAD
2 stops29h 55mSWISS
sáb. 1/36:10 pmIAD - OPO
2 stops19h 25mSWISS
Deal found 12/16$1,308

Find 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 diciembre 17, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$497
(Scandinavian Airlines)

One-way from

$358
(Travelocity)

Popular in

July

Cheapest in

September

Average price

$637

Good round-trip deal

$598 or less

Good one-way deal

$602 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. 10% potential increase in price ($85 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 diciembre 17, 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. 1/30

2:20 pm-9:00 pm

1 stop11h 40m

Washington, D.C. Dulles Intl

vie. 2/6

10:30 pm-5:00 pm

1 stop13h 30m

$506

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

jue. 1/29

7:00 am-3:15 pm

1 stop13h 15m

Washington, D.C. Dulles Intl

jue. 2/5

5:30 pm-9:55 am

1 stop11h 25m

$508

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

sáb. 1/31

5:55 pm-6:45 pm

1 stop29h 50m

Washington, D.C. Dulles Intl

mié. 2/11

8:45 pm-11:35 am

1 stop9h 50m

$539

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

vie. 3/13

6:00 am-3:35 pm

1 stop13h 35m

Washington, D.C. Dulles Intl

dom. 4/12

5:37 pm-9:45 am

1 stop11h 08m

$591

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

lun. 3/16

6:00 am-9:15 pm

1 stop19h 15m

Washington, D.C. Dulles Intl

dom. 4/12

8:20 pm-6:30 pm

1 stop17h 10m

$591

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

sáb. 3/14

6:00 am-4:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

lun. 4/13

5:37 pm-9:45 am

1 stop11h 08m

$591

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

sáb. 3/14

6:00 am-4:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

dom. 4/12

5:37 pm-9:45 am

1 stop11h 08m

$591

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

mié. 3/18

6:00 am-9:22 pm

2 stops19h 22m

Washington, D.C. Dulles Intl

lun. 4/13

5:37 pm-9:45 am

1 stop11h 08m

$597

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

jue. 3/12

6:00 am-8:37 pm

2 stops18h 37m

Washington, D.C. Dulles Intl

lun. 4/13

5:37 pm-9:45 am

1 stop11h 08m

$597

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

jue. 3/12

6:00 am-8:37 pm

2 stops18h 37m

Washington, D.C. Dulles Intl

dom. 4/12

5:37 pm-9:45 am

1 stop11h 08m

$597

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 38 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, December is the cheapest month in which you can book a flight from Portugal to Washington, D.C. Dulles Intl Airport (average of $492). 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 diciembre 17, 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 33% versus a flight in the morning.

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

Explore weekly flight availability from Portugal 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 diciembre 17, 2025.

The most flights from PT0 to IAD are scheduled on a Monday (5 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (3 on average).

How often are flights from Portugal to Washington, D.C. delayed?

About 30% of weekly flights between Portugal and Washington, D.C. have experienced delays in the past year, with the average delay time being 135 minutes.

What is the most punctual flight time for Portugal to Washington, D.C. flights?

Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Tuesday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Portugal to Washington, D.C. flights?

Over the last year, United Airlines have had the lowest number of delays on this route, with just 26% of flights being delayed.

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 diciembre 17, 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
9,092 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

AMS - EWR

It was good! The first 3/4 of the trip was uncomfortably cold. Only one option for lunch that I didn’t enjoy (vegetarian).
United Airlines
7.4
Good
9,092 reviews
United Airlines
7.4
Good
9,092 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

AMS - EWR

It was good! The first 3/4 of the trip was uncomfortably cold. Only one option for lunch that I didn’t enjoy (vegetarian).
TAP AIR PORTUGAL
7.2
Good
2,091 reviews
United Airlines
7.4
Good
9,092 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

AMS - EWR

It was good! The first 3/4 of the trip was uncomfortably cold. Only one option for lunch that I didn’t enjoy (vegetarian).

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 TAP AIR PORTUGAL, Royal Air Maroc, and United Airlines fly from Portugal to Washington, D.C. Dulles Intl Airport in about 11h 40m. The time it takes to get you to your destination can typically vary by up to 18h 10m. 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 TAP AIR PORTUGAL ($366), JetBlue ($395), and Aer Lingus ($416).

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

    Consider Air Canada (63%), United Airlines (63%) or Lufthansa (63%) 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 $497. On average you can expect to pay $852. The most popular route, (Lisbon Humberto Delgado - Washington, D.C. Dulles Intl), can usually be booked for $512.

  • 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, December is the cheapest month in which you can book a flight from Portugal to Washington, D.C. Dulles Intl Airport (average of $492). 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
Owings Mills
Springfield
Hanover
Silver Spring
Fredericksburg
Linthicum Heights
Rockville
Laurel
Towson
Manassas
National Harbor
Bowie
Largo
McLean
Clinton
Cordova

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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.
Frankfurt to Dulles Intl flights
Heathrow to Dulles Intl flights
Charles de Gaulle to Dulles Intl flights
Heathrow to Baltimore flights
Bruxelles-National to Dulles Intl flights
Frankfurt to Baltimore flights
Frankfurt to Reagan-National flights
Gatwick to Dulles Intl flights
Heathrow to Reagan-National flights
London City to Dulles Intl flights
Charles de Gaulle to Baltimore flights
Madrid to Dulles Intl flights
Charles de Gaulle to Reagan-National flights
Gatwick to Baltimore flights
Orly to Dulles Intl flights
Amsterdam to Dulles Intl flights
Gatwick to Reagan-National flights
Stansted to Dulles Intl flights
Istanbul to Dulles Intl flights
Luton to Dulles Intl flights
Dublin to Dulles Intl flights
Madrid to Baltimore flights
Bruxelles-National to Baltimore flights
Barcelona-El Prat to Dulles Intl flights
Bruxelles-National to Reagan-National flights
Zurich to Dulles Intl flights
Munich to Dulles Intl flights
Frederic Chopin to Dulles Intl flights
Amsterdam to Baltimore flights
Berlin to Dulles Intl flights
Madrid to Reagan-National flights
Vienna to Dulles Intl flights
Leonardo da Vinci/Fiumicino to Dulles Intl flights
Berlin to Baltimore flights
Amsterdam to Reagan-National flights
Frederic Chopin to Baltimore flights
Barcelona-El Prat to Baltimore flights
Berlin to Reagan-National flights
Luton to Baltimore flights
Dublin to Baltimore flights
Frederic Chopin to Reagan-National flights
Vicenza to Dulles Intl flights
Charleroi Brussels to Dulles Intl flights
Vienna to Reagan-National flights
Barcelona-El Prat to Reagan-National flights
Geneva to Dulles Intl flights
Malpensa to Dulles Intl 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 diciembre 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$492Average$763FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$497Average$726FlexibilityNo cancel feeOn-time69%

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