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$237+ Cheap flights from Dulles Intl (IAD) to Portugal

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 10/31. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LIS
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
1 adult, Economy
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Cheap flight deals from Dulles Intl to Portugal

Keep the following information in mind while searching for Dulles Intl to Portugal flight deals. Data was last updated septiembre 11, 2025.

Round-trip from

$488
(Scandinavian Airlines)

One-way from

$237
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$878

Good round-trip deal

$620 or less

Good one-way deal

$293 or less
From Washington, D.C. Dulles Intl to Portugal
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One-way flight from Washington, D.C. Dulles Intl to Portugal
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Highest demand for flights based on searches. 2% potential increase in price ($20 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($36 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Portugal.
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Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Portugal.
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Find flight deals from Dulles Intl to Portugal

Cheapest flights from Dulles Intl to Portugal
Explore the most affordable flight options available from Dulles Intl to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 11, 2025.

This Scandinavian Airlines deal was found by Cheapflights users on 9/10. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/277:49 pmIAD - FAO
2 stops39h 31mScandinavian Airlines
mié. 12/310:35 amFAO - IAD
2 stops35h 40mScandinavian Airlines
Deal found 9/10$488
This Mytrip deal was found by Cheapflights users on 9/11. 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.
vie. 10/1710:20 pmIAD - FAO
1 stop20h 30mTAP AIR PORTUGAL
dom. 11/24:35 pmFAO - IAD
1 stop27h 40mTAP AIR PORTUGAL
Deal found 9/11$525
This FlightHub deal was found by Cheapflights users on 9/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/1110:35 pmIAD - FAO
1 stop20h 15mTAP AIR PORTUGAL
lun. 10/206:10 pmFAO - IAD
1 stop31h 40mTAP AIR PORTUGAL
Deal found 9/10$534
This KAYAK deal was found by Cheapflights users on 9/9. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/238:30 pmIAD - OPO
2 stops30h 55mSWISS
dom. 11/306:35 pmOPO - IAD
2 stops51h 05mSWISS
Deal found 9/9$541
This Air Canada deal was found by Cheapflights users on 9/11. 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.
mié. 10/221:00 pmIAD - OPO
2 stops17h 25mAir Canada
vie. 10/316:00 amOPO - IAD
2 stops19h 20mAir Canada
Deal found 9/11$543
This KAYAK deal was found by Cheapflights users on 9/10. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/1310:20 pmIAD - OPO
1 stop20h 00mLufthansa
mar. 10/216:00 amOPO - IAD
1 stop14h 50mLufthansa
Deal found 9/10$544
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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.
jue. 11/1310:55 pmIAD - OPO
2 stops18h 30mLufthansa
jue. 11/276:00 amOPO - IAD
1 stop14h 50mLufthansa
Deal found 9/10$545
This Mytrip deal was found by Cheapflights users on 9/10. 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.
dom. 10/58:30 pmIAD - OPO
3 stops30h 20mMultiple Airlines
jue. 10/910:25 pmOPO - IAD
3 stops28h 45mMultiple Airlines
Deal found 9/10$548
This KAYAK deal was found by Cheapflights users on 9/10. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/78:45 pmIAD - OPO
1 stop30h 00mSWISS
mié. 11/57:20 pmOPO - IAD
1 stop26h 20mSWISS
Deal found 9/10$549
This oojo deal was found by Cheapflights users on 9/11. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/78:30 pmIAD - OPO
1 stop33h 20mSWISS
sáb. 11/1512:00 pmOPO - IAD
1 stop33h 40mSWISS
Deal found 9/11$551
This Scandinavian Airlines deal was found by Cheapflights users on 9/10. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/277:49 pmIAD - FAO
2 stops39h 31mScandinavian Airlines
mar. 12/210:50 amFAO - IAD
1 stop35h 25mScandinavian Airlines
Deal found 9/10$551
This CheapOair deal was found by Cheapflights users on 9/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/148:45 pmIAD - OPO
1 stop30h 00mMultiple Airlines
jue. 10/236:00 amOPO - IAD
2 stops20h 05mMultiple Airlines
Deal found 9/10$555

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Portugal 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 septiembre 11, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Portugal that are best for you.

Fly from

Dulles Intl

Fly to

Portugal

Route

Depart

Return

Price

Washington, D.C.Faro

IAD - FAO

IADFAO

Washington, D.C. Dulles Intl

mié. 10/29

11:30 pm-3:45 pm

1 stop12h 15m

Faro

mar. 11/4

6:05 am-2:35 pm

1 stop13h 30m

$525

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

jue. 2/12

6:05 pm-10:30 am

1 stop11h 25m

Porto

mié. 2/18

6:00 am-11:35 pm

2 stops22h 35m

$538

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

mar. 10/14

10:20 am-11:30 am

2 stops20h 10m

Porto

jue. 10/23

6:00 am-9:05 pm

2 stops20h 05m

$543

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

mié. 11/19

9:45 am-11:40 am

2 stops20h 55m

Porto

sáb. 12/13

6:00 am-5:30 pm

2 stops16h 30m

$548

Washington, D.C.Faro

IAD - FAO

IADFAO

Washington, D.C. Dulles Intl

jue. 11/27

7:49 pm-4:20 pm

2 stops39h 31m

Faro

mar. 12/2

10:50 am-5:15 pm

1 stop35h 25m

$551

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

mar. 10/14

9:45 am-7:00 pm

3 stops28h 15m

Porto

mar. 10/21

10:50 pm-9:05 pm

2 stops27h 15m

$557

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

jue. 10/23

1:00 pm-10:40 am

2 stops16h 40m

Porto

mar. 11/4

11:10 am-7:15 pm

1 stop13h 05m

$571

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

mié. 11/19

4:25 pm-1:15 pm

2 stops15h 50m

Porto

vie. 11/28

6:00 am-8:26 pm

2 stops19h 26m

$572

Washington, D.C.Funchal

IAD - FNC

IADFNC

Washington, D.C. Dulles Intl

lun. 11/3

5:30 pm-9:15 am

1 stop10h 45m

Funchal Madeira

dom. 11/9

4:10 am-3:15 pm

1 stop16h 05m

$577

Washington, D.C.Funchal

IAD - FNC

IADFNC

Washington, D.C. Dulles Intl

sáb. 11/29

5:30 pm-11:40 am

1 stop13h 10m

Funchal Madeira

sáb. 12/13

7:55 am-3:15 pm

1 stop12h 20m

$577

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 60 results
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Best time to book a flight from Dulles Intl to Portugal

Have a flexible travel schedule? Discover the best time to fly to Portugal from Dulles Intl 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 Washington, D.C. Dulles Intl Airport to Portugal

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

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Portugal (average of $612). Flying from Washington, D.C. Dulles Intl Airport to Portugal in June is currently the most expensive (average of $1,127). 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 IAD to PT?

Find hourly flight availability from Dulles Intl to Portugal. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 11, 2025.

One of the essential ways to save on airfare from Washington, D.C. Dulles Intl Airport to Portugal is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 8% on airfare.

What is the cheapest day to fly from Washington, D.C. Dulles Intl Airport to Portugal?

Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to Portugal. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Portugal flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Thursday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Portugal

Get insights into the airlines that provide service to Portugal. 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 Portugal. Reviews last updated septiembre 11, 2025.
See what other customers who have flown with United Airlines, Aer Lingus, and TAP AIR PORTUGAL from Washington, D.C. Dulles Intl Airport to Portugal have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,937 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Food

6.6

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,937 reviews
United Airlines
7.4
Good
8,937 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Food

6.6

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Aer Lingus
7.2
Good
1,271 reviews
United Airlines
7.4
Good
8,937 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Food

6.6

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
TAP AIR PORTUGAL
7.1
Good
1,977 reviews
United Airlines
7.4
Good
8,937 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Food

6.6

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Lufthansa
6.8
Okay
7,409 reviews
United Airlines
7.4
Good
8,937 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Food

6.6

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Royal Air Maroc
6.2
Okay
511 reviews
United Airlines
7.4
Good
8,937 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Food

6.6

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Portugal. 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 Washington, D.C. Dulles Intl Airport to Portugal?

    TAP AIR PORTUGAL, Delta, and United Airlines can get you from Washington, D.C. Dulles Intl Airport to Portugal in just under 11h 25m. Your travel time can differ by up to 9h 30m. The distance between Washington, D.C. Dulles Intl Airport and Portugal is about 3537 mi. This flight may include one or multiple stops.

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

    While some choose either Washington, D.C. Dulles Intl - Porto or Washington, D.C. Dulles Intl - Ponta Delgada Nordela, Washington, D.C. Dulles Intl - Lisbon Humberto Delgado is the most popular route from Washington, D.C. Dulles Intl Airport to Portugal.

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

    The top 3 most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to Portugal are JetBlue (57%), Air Canada (55%) and United Airlines (55%).

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

    Looking for the cheapest flight from Washington, D.C. Dulles Intl Airport to Portugal? While on average our users pay $1,371, our data indicates the cheapest price to be $214. The most popular route (Washington, D.C. Dulles Intl - Lisbon Humberto Delgado), is priced around $451.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Portugal (average of $612). Flying from Washington, D.C. Dulles Intl Airport to Portugal in June is currently the most expensive (average of $1,127). 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

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Alternative routes for Dulles Intl to Portugal

See prices for flight routes from nearby airports that may be better suited for you.
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Baltimore to London City flights
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Baltimore to Barcelona-El Prat flights
Reagan-National to London City flights
Baltimore to Stansted flights

Top 10 airlines flying from Dulles Intl to Portugal

Discover the top 10 airlines that operate flights from Dulles Intl to Portugal. 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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
PLAYCheapest$338Average$453FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$418Average$820FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$430Average$731FlexibilityNo cancel feeOn-time75%
TAP AIR PORTUGALCheapest$469Average$908FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$480Average$694FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$508Average$646FlexibilityNo cancel feeOn-time71%
IberiaCheapest$515Average$721FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$543Average$962FlexibilityNo cancel feeOn-time69%
Royal Air MarocCheapest$552Average$649FlexibilityNo cancel feeOn-time75%
Turkish AirlinesCheapest$586Average$667FlexibilityNo cancel feeOn-time77%

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