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

Departing from Washington, D.C. Dulles Intl Airport to Porto will take you 10h 40m. The distance from Washington, D.C. Dulles Intl Airport to Porto is about 3537 mi. This flight may include one or multiple stops.

What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to Porto round-trip?

Currently priced at $439, Delta will fly you from Washington, D.C. Dulles Intl Airport to Porto and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and TAP AIR PORTUGAL - these airlines can fly you to your destination from $494 and $505, respectively. These flights start at 38% lower than the current average price 3 months from now.

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

$253 is the cheapest one-way deal found within the past few days, from TAP AIR PORTUGAL. You may also be able to find cheap deals on KLM and United Airlines, with prices starting from $384 and $483, respectively.

In terms of precipitation, rainfall in Porto ranges from 0.7 - 7.7 inches per month. December is typically the wettest month, when rainfall can reach 7.7 in. July is typically the driest time to visit Porto when rainfall is around 0.7 in.

If weather is an important factor for your trip to Porto, 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 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

What are the most popular airlines that fly from Washington, D.C. Dulles Intl Airport to Porto?

Consider TAP AIR PORTUGAL, United Airlines or Iberia when booking your flight. These represent the most popular airlines when flying from Washington, D.C. Dulles Intl Airport to Porto.

Most accurate provider : When it comes to deals on Washington, D.C. Dulles Intl Airport-Porto flights, users find the pricing of Gotogate to be most consistent on Cheapflights vs. Gotogate Users can find the same prices on Washington, D.C. Dulles Intl Airport-Porto flight deals on Cheapflights vs. Gotogate >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Porto flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Washington, D.C. Dulles Intl Airport-Porto flights, Cheapflights users trust Gotogate the most. Gotogate 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 Washington, D.C. Dulles Intl Airport-Porto flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly into for flights to Porto from Washington, D.C. Dulles Intl?

Located just 6.8 mi from the city center, Porto is the airport most travelers will use when flying to Porto from Washington, D.C. Dulles Intl. Booking flights from Washington, D.C. Dulles Intl to Porto (OPO) should be relatively easy as there are 0 daily inbound flights from Washington, D.C. Dulles Intl from 6 different airlines.

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

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

How can I find direct flights from Dulles Intl to Porto?

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

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

Yes. Cheapflights offers flight deals from Dulles Intl to Porto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$339+ Flights from Washington, D.C. Dulles Intl Airport to Porto

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from Dulles Intl to Porto with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Porto are usually found in October or February, booked 40 days in advance, depart on a Sunday or Saturday and return on a Monday

Cheap flight deals from Dulles Intl to Porto

Cheapest flights from Dulles Intl to Porto
Explore the most affordable flight options available from Dulles Intl to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

Tue 12/309:45 pmIAD - OPO

1 stop15h 00mBritish Airways

Wed 1/76:35 pmOPO - IAD

1 stop26h 00mBritish Airways

Deal found 12/10

$752

Wed 12/105:20 pmIAD - OPO

1 stop33h 35mSWISS

Wed 12/1712:10 pmOPO - IAD

1 stop33h 30mSWISS

Deal found 12/9

$761

Wed 12/106:05 pmIAD - OPO

1 stop11h 25mKLM

Wed 12/1711:15 amOPO - IAD

1 stop33h 50mKLM

Deal found 12/9

$783

Wed 12/1011:58 amIAD - OPO

2 stops17h 32mDelta

Wed 12/176:00 amOPO - IAD

1 stop15h 05mDelta

Deal found 12/9

$788

Wed 12/1010:55 pmIAD - OPO

2 stops31h 45mMultiple Airlines

Wed 12/177:20 pmOPO - IAD

1 stop25h 10mMultiple Airlines

Deal found 12/9

$819

Wed 12/106:10 pmIAD - OPO

2 stops36h 30mUnited Airlines

Wed 12/176:00 amOPO - IAD

2 stops20h 25mUnited Airlines

Deal found 12/9

$820

Sat 12/138:45 pmIAD - OPO

1 stop15h 10mMultiple Airlines

Mon 2/28:40 pmOPO - IAD

2 stops28h 15mMultiple Airlines

Deal found 12/10

$888

Thu 12/116:10 pmIAD - OPO

2 stops36h 30mUnited Airlines

Wed 12/176:00 amOPO - IAD

2 stops37h 00mUnited Airlines

Deal found 12/10

$895

Best flights from Dulles Intl to Porto
Discover carefully curated flight deals from Dulles Intl to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 12, 2025.

Tue 3/245:25 pmIAD - OPO

1 stop13h 50mSWISS

Tue 3/318:40 amOPO - IAD

1 stop12h 40mSWISS

Deal found 12/11

$463

Tue 3/245:35 pmIAD - OPO

1 stop11h 55mUnited Airlines

Tue 3/316:00 amOPO - IAD

1 stop18h 55mUnited Airlines

Deal found 12/10

$476

Tue 3/107:50 pmIAD - OPO

1 stop10h 40mKLM

Mon 3/1611:15 amOPO - IAD

1 stop33h 50mKLM

Deal found 12/10

$478

Sun 1/186:50 pmIAD - OPO

1 stop10h 40mDelta

Mon 1/2611:15 amOPO - IAD

1 stop33h 50mDelta

Deal found 12/10

$478

Tue 2/2412:35 pmIAD - OPO

2 stops16h 55mMultiple Airlines

Tue 3/34:10 pmOPO - IAD

1 stop28h 55mMultiple Airlines

Deal found 12/11

$482

Tue 3/245:25 pmIAD - OPO

1 stop13h 50mSWISS

Mon 3/307:20 pmOPO - IAD

1 stop26h 00mSWISS

Deal found 12/11

$482

Tue 2/2412:38 pmIAD - OPO

2 stops16h 52mKLM

Tue 3/35:00 amOPO - IAD

1 stop16h 05mKLM

Deal found 12/10

$482

Mon 1/1912:23 pmIAD - OPO

2 stops17h 07mDelta

Mon 1/2611:15 amOPO - IAD

1 stop33h 50mDelta

Deal found 12/10

$482

Tue 3/241:13 pmIAD - OPO

2 stops18h 52mMultiple Airlines

Mon 3/307:20 pmOPO - IAD

1 stop24h 55mMultiple Airlines

Deal found 12/11

$486

Mon 1/1212:23 pmIAD - OPO

2 stops17h 07mDelta

Mon 1/2611:15 amOPO - IAD

1 stop33h 50mDelta

Deal found 12/10

$484

Last-minute flights from Dulles Intl to Porto
Discover last-minute flight deals from Dulles Intl to Porto. Data last updated December 12, 2025 and is based on user searches.

Mon 1/125:25 pmIAD - OPO

1 stop12h 50mSWISS

Mon 1/2612:05 pmOPO - IAD

1 stop32h 25mSWISS

Deal found 12/8

$434

Mon 1/125:45 pmIAD - OPO

1 stop13h 20mBrussels Airlines

Mon 1/2612:55 pmOPO - IAD

1 stop30h 40mBrussels Airlines

Deal found 12/10

$447

Mon 1/1212:23 pmIAD - OPO

2 stops17h 07mDelta

Mon 1/2611:15 amOPO - IAD

1 stop33h 50mDelta

Deal found 12/8

$484

Wed 1/1410:15 pmIAD - OPO

2 stops31h 55mSWISS

Thu 1/2212:05 pmOPO - IAD

1 stop32h 05mSWISS

Deal found 12/11

$442

Wed 1/145:45 pmIAD - OPO

1 stop13h 20mMultiple Airlines

Thu 1/2212:05 pmOPO - IAD

1 stop32h 05mMultiple Airlines

Deal found 12/10

$458

Wed 1/145:40 pmIAD - OPO

1 stop14h 35mLufthansa

Thu 1/226:00 amOPO - IAD

1 stop14h 50mLufthansa

Deal found 12/11

$475

Wed 1/141:15 pmIAD - OPO

2 stops19h 00mAir Canada

Thu 1/226:00 amOPO - IAD

2 stops39h 30mAir Canada

Deal found 12/11

$488

Mon 1/196:50 pmIAD - OPO

1 stop10h 40mDelta

Mon 1/2611:15 amOPO - IAD

1 stop33h 50mDelta

Deal found 12/10

$478

Mon 1/199:45 amIAD - OPO

2 stops21h 20mMultiple Airlines

Mon 2/237:20 pmOPO - IAD

1 stop24h 45mMultiple Airlines

Deal found 12/9

$485

Wed 1/215:45 pmIAD - OPO

1 stop13h 20mMultiple Airlines

Wed 1/2812:10 pmOPO - IAD

1 stop32h 20mMultiple Airlines

Deal found 12/8

$464

One-way flights from Dulles Intl to Porto
Search for one-way flight options from Dulles Intl to Porto. Find affordable one-way fares based on user searches. Data last updated December 12, 2025.

Mon 1/57:40 pmIAD - OPO

3 stops39h 30mMultiple Airlines

Deal found 12/11

$350

Fri 3/610:30 pmIAD - OPO

1 stop18h 30mTAP AIR PORTUGAL

Deal found 12/11

$423

Sun 1/410:20 pmIAD - OPO

2 stops31h 55mSWISS

Deal found 12/11

$443

Fri 3/612:23 pmIAD - OPO

2 stops17h 07mDelta

Deal found 12/10

$479

Mon 1/56:05 pmIAD - OPO

1 stop19h 35mKLM

Deal found 12/11

$498

Sun 1/41:30 pmIAD - OPO

1 stop20h 40mTurkish Airlines

Deal found 12/11

$527

Wed 12/246:05 pmIAD - OPO

1 stop11h 25mKLM

Deal found 12/11

$549

Sun 1/410:55 pmIAD - OPO

3 stops30h 25mMultiple Airlines

Deal found 12/11

$632

Wed 12/2410:30 pmIAD - OPO

3 stops37h 25mMultiple Airlines

Deal found 12/11

$700

Wed 12/175:05 pmIAD - OPO

3 stops46h 55mMultiple Airlines

Deal found 12/10

$730

Find flight deals from Dulles Intl to Porto

Most accurate provider	Gotogate 3 stars
Most trusted provider	Gotogate 3 stars
Round-trip from	$434 (Kiwi.com)
One-way from	$350 (Kiwi.com)
Popular in	May
Cheapest in	October
Average price	$781

Provider with most accurate pricing for Washington, D.C. Dulles Intl-Porto flight deals.

Search Deals

Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Porto flights.

Search Deals

From Washington, D.C. Dulles Intl to Porto

Search Deals

One-way flight from Washington, D.C. Dulles Intl to Porto

Search Deals

Highest demand for flights based on searches. 10% potential increase in price ($79 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($15 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 3/24

5:25 pm-11:15 am

1 stop13h 50m

Porto

Tue 3/31

8:40 am-4:20 pm

1 stop12h 40m

$463

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 3/24

5:35 pm-9:30 am

1 stop11h 55m

Porto

Tue 3/31

6:00 am-7:55 pm

1 stop18h 55m

$476

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 3/10

7:50 pm-10:30 am

1 stop10h 40m

Porto

Mon 3/16

11:15 am-5:05 pm

1 stop33h 50m

$478

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 1/18

6:50 pm-10:30 am

1 stop10h 40m

Porto

Mon 1/26

11:15 am-4:05 pm

1 stop33h 50m

$478

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 2/24

12:35 pm-10:30 am

2 stops16h 55m

Porto

Tue 3/3

4:10 pm-4:05 pm

1 stop28h 55m

$482

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 3/24

5:25 pm-11:15 am

1 stop13h 50m

Porto

Mon 3/30

7:20 pm-4:20 pm

1 stop26h 00m

$482

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 2/24

12:38 pm-10:30 am

2 stops16h 52m

Porto

Tue 3/3

5:00 am-4:05 pm

1 stop16h 05m

$482

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Mon 1/19

12:23 pm-10:30 am

2 stops17h 07m

Porto

Mon 1/26

11:15 am-4:05 pm

1 stop33h 50m

$482

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Mon 1/12

12:23 pm-10:30 am

2 stops17h 07m

Porto

Mon 1/26

11:15 am-4:05 pm

1 stop33h 50m

$484

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 3/24

1:13 pm-12:05 pm

2 stops18h 52m

Porto

Mon 3/30

7:20 pm-3:15 pm

1 stop24h 55m

$486

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

Showing 1-10 of 20 results

Compare providers for flights from Dulles Intl to Porto

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to Porto in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy2 stars	Trust Score*3 stars
Gotogate	Price Accuracy3 stars	Trust Score*3 stars
Ovago	Price Accuracy2 stars	Trust Score*2 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 Washington, D.C. Dulles Intl Airport-Porto flights, users find the pricing of Gotogate to be most consistent on Cheapflights vs. Gotogate Users can find the same prices on Washington, D.C. Dulles Intl Airport-Porto flight deals on Cheapflights vs. Gotogate >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Porto flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Porto flights, Cheapflights users trust Gotogate the most. Gotogate 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 Washington, D.C. Dulles Intl Airport-Porto 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 Dulles Intl to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto 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 Porto

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to Porto?

To ensure you get the cheapest price possible for a flight from Washington, D.C. Dulles Intl Airport to Porto, you should look to book at least 40 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 Washington, D.C. Dulles Intl Airport to Porto?

Currently, December is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Porto (average of $332). Flying from Washington, D.C. Dulles Intl Airport to Porto in May is currently the most expensive (average of $688). 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 OPO?

It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to Porto at noon. Doing so could potentially save you 42% on the flight price compared to flying in the evening, which is usually more expensive.

Reviews of airlines servicing Porto

Get a feel of what it's like to fly with Delta, United Airlines, and TAP AIR PORTUGAL from Washington, D.C. Dulles Intl Airport to Porto by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

7.9

Good

8,005 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Delta

7.9

Good

8,005 reviews

Delta

7.9

Good

8,005 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

United Airlines

7.4

Good

9,095 reviews

Delta

7.9

Good

8,005 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

TAP AIR PORTUGAL

7.1

Good

2,087 reviews

Delta

7.9

Good

8,005 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

Iberia

7.0

Good

3,045 reviews

Delta

7.9

Good

8,005 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

Lufthansa

6.8

Okay

7,626 reviews

Delta

7.9

Good

8,005 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

Related info for your journey

What airport do you fly into for flights to Porto from Washington, D.C. Dulles Intl?
Located just 6.8 mi from the city center, Porto is the airport most travelers will use when flying to Porto from Washington, D.C. Dulles Intl. Booking flights from Washington, D.C. Dulles Intl to Porto (OPO) should be relatively easy as there are 0 daily inbound flights from Washington, D.C. Dulles Intl from 6 different airlines.
How long is the flight from Washington, D.C. Dulles Intl Airport to Porto?
Departing from Washington, D.C. Dulles Intl Airport to Porto will take you 10h 40m. The distance from Washington, D.C. Dulles Intl Airport to Porto is about 3537 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to Porto round-trip?
Currently priced at $439, Delta will fly you from Washington, D.C. Dulles Intl Airport to Porto and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and TAP AIR PORTUGAL - these airlines can fly you to your destination from $494 and $505, respectively. These flights start at 38% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Porto one-way?
$253 is the cheapest one-way deal found within the past few days, from TAP AIR PORTUGAL. You may also be able to find cheap deals on KLM and United Airlines, with prices starting from $384 and $483, respectively.
Can I find deals for flights from Dulles Intl to Porto that include hotel bookings?
Yes. In addition to deals on Dulles Intl to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Dulles Intl to Porto?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Porto.
Can I find deals for business class flights from Dulles Intl to Porto?
Yes. Cheapflights offers flight deals from Dulles Intl to Porto 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 Porto?
Currently, December is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Porto (average of $332). Flying from Washington, D.C. Dulles Intl Airport to Porto in May is currently the most expensive (average of $688). 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

Aveiro

Arcos de Valdevez

Coimbra

Vila Nova de Gaia

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Dulles Intl to Porto

Dulles Intl to Lisbon flights

Baltimore to Lisbon flights

Reagan-National to Lisbon flights

Reagan-National to Porto flights

Baltimore to Porto flights

Dulles Intl to Funchal flights

Reagan-National to Funchal flights

Dulles Intl to Ponta Delgada flights

Reagan-National to Ponta Delgada flights

Baltimore to Funchal flights

Dulles Intl to Faro flights

Reagan-National to Faro flights

Dulles Intl to Lajes flights

Baltimore to Ponta Delgada flights

Baltimore to Faro flights

Baltimore to Lajes flights

Dulles Intl to Horta flights

Dulles Intl to Pico Island flights

Dulles Intl to Porto Santo flights

Other flights to Porto

Top 6 airlines flying from Dulles Intl to Porto

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$439	Average$826	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$494	Average$781	FlexibilityNo cancel fee	On-time69%
TAP AIR PORTUGAL	Cheapest$505	Average$777	FlexibilityNo cancel fee	On-timeN/A
Iberia	Cheapest$515	Average$672	FlexibilityNo cancel fee	On-time77%
KLM	Cheapest$555	Average$741	FlexibilityNo cancel fee	On-time75%
Lufthansa	Cheapest$615	Average$693	FlexibilityNo cancel fee	On-time76%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$339+ Cheap flights from Dulles Intl (IAD) to Porto (OPO)

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 12/30. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Dulles Intl to Porto with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Porto are usually found in October or February, booked 40 days in advance, depart on a Sunday or Saturday and return on a Monday

Cheap flight deals from Dulles Intl to Porto

Cheapest flights from Dulles Intl to PortoExplore the most affordable flight options available from Dulles Intl to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

Explore the most affordable flight options available from Dulles Intl to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

Find flight deals from Dulles Intl to Porto

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

Compare providers for flights from Dulles Intl to Porto

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 Dulles Intl to Porto in December.

Best time to book a flight from Dulles Intl to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Dulles Intl with our price prediction graph.

Cheapflights Insights

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

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to Porto?

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

What is the cheapest time of day to fly from IAD to OPO?

Reviews of airlines servicing Porto

Get a feel of what it's like to fly with Delta, United Airlines, and TAP AIR PORTUGAL from Washington, D.C. Dulles Intl Airport to Porto by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Porto. 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 into for flights to Porto from Washington, D.C. Dulles Intl?

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

What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to Porto round-trip?

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

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

How can I find direct flights from Dulles Intl to Porto?

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

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

Traveling to a place near Porto?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Dulles Intl to Porto

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

Top 6 airlines flying from Dulles Intl to Porto

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Dulles Intl to Porto
Explore the most affordable flight options available from Dulles Intl to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.