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

TAP AIR PORTUGAL, Air Canada, and United Airlines can get you from Porto to Washington, D.C. Dulles Intl Airport in just under 13h 15m. Your travel time can differ by up to 25h 31m. Porto and Washington, D.C. Dulles Intl Airport are separated by a distance of 3537 mi. Both multi-stop and nonstop flights can be found to your destination and back.

What is the cheapest airline to fly from Porto to Washington, D.C. Dulles Intl Airport round-trip?

TAP AIR PORTUGAL, at $492, was found to be the cheapest airline from Porto to Washington, D.C. Dulles Intl Airport..

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.

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).

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

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

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

Porto (OPO), located 6.8 mi from the city center, is the airport you fly out of when you book flights from Porto to Washington, D.C. Dulles Intl. 1 airline have flights from Porto to Washington, D.C. Dulles Intl on a regular basis. Booking flights from Porto to Washington, D.C. Dulles Intl should not be difficult; the airport handles an average of 0 outbound flights to Washington, D.C. Dulles Intl per day.

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

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

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

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

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

Yes. Cheapflights offers flight deals from Porto 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.

$367+ Flights from Porto to Washington, D.C. Dulles Intl Airport

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Cheap flight deals from Porto to Dulles Intl

Cheapest flights from Porto to Dulles Intl
Explore the most affordable flight options available from Porto to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

Wed 12/246:00 amOPO - IAD

1 stop13h 35mUnited Airlines

Sat 1/39:00 amIAD - OPO

2 stops25h 05mUnited Airlines

Deal found 12/15

$829

Mon 12/1511:25 amOPO - IAD

1 stop13h 05mKLM

Mon 1/56:50 pmIAD - OPO

1 stop10h 40mKLM

Deal found 12/13

$839

Mon 12/1512:30 pmOPO - IAD

2 stops34h 00mUnited Airlines

Mon 1/510:17 pmIAD - OPO

2 stops35h 28mUnited Airlines

Deal found 12/13

$919

Mon 12/151:15 pmOPO - IAD

2 stops30h 20mMultiple Airlines

Mon 1/59:45 amIAD - OPO

2 stops28h 30mMultiple Airlines

Deal found 12/13

$921

Wed 12/247:20 pmOPO - IAD

2 stops23h 40mMultiple Airlines

Sat 1/35:15 pmIAD - OPO

1 stop24h 10mMultiple Airlines

Deal found 12/13

$996

Wed 12/246:00 amOPO - IAD

2 stops15h 23mKLM

Sat 1/36:05 pmIAD - OPO

1 stop11h 25mKLM

Deal found 12/14

$1,021

Wed 12/316:00 pmOPO - IAD

1 stop26h 15mTAP AIR PORTUGAL

Sun 1/410:30 pmIAD - OPO

1 stop18h 30mTAP AIR PORTUGAL

Deal found 12/15

$1,082

Wed 12/314:05 pmOPO - IAD

2 stops28h 10mMultiple Airlines

Sun 1/410:30 pmIAD - OPO

2 stops19h 30mMultiple Airlines

Deal found 12/15

$1,129

Best flights from Porto to Dulles Intl
Discover carefully curated flight deals from Porto to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 15, 2025.

Thu 1/157:00 amOPO - IAD

1 stop13h 15mTAP AIR PORTUGAL

Wed 1/2810:30 pmIAD - OPO

1 stop13h 30mTAP AIR PORTUGAL

Deal found 12/15

$508

Wed 1/286:45 amOPO - IAD

2 stops16h 45mMultiple Airlines

Wed 2/47:40 pmIAD - OPO

2 stops14h 15mMultiple Airlines

Deal found 12/14

$529

Thu 1/156:00 amOPO - IAD

2 stops38h 46mAir Canada

Wed 1/289:45 amIAD - OPO

2 stops20h 30mAir Canada

Deal found 12/14

$595

Thu 1/156:00 amOPO - IAD

1 stop14h 50mUnited Airlines

Wed 1/285:15 pmIAD - OPO

1 stop13h 25mUnited Airlines

Deal found 12/13

$595

Mon 1/1211:15 amOPO - IAD

1 stop33h 50mKLM

Mon 1/196:50 pmIAD - OPO

1 stop10h 40mKLM

Deal found 12/15

$599

Thu 1/156:35 amOPO - IAD

1 stop14h 30mDelta

Wed 1/2812:23 pmIAD - OPO

2 stops17h 07mDelta

Deal found 12/14

$600

Thu 1/156:00 amOPO - IAD

2 stops38h 46mMultiple Airlines

Wed 1/289:45 amIAD - OPO

2 stops20h 30mMultiple Airlines

Deal found 12/15

$596

Sun 1/1112:30 pmOPO - IAD

2 stops34h 05mUnited Airlines

Sun 1/185:10 pmIAD - OPO

2 stops37h 30mUnited Airlines

Deal found 12/14

$601

Wed 1/285:00 amOPO - IAD

2 stops19h 09mDelta

Wed 2/46:50 pmIAD - OPO

1 stop10h 40mDelta

Deal found 12/14

$606

Fri 1/2312:30 pmOPO - IAD

1 stop32h 20mUnited Airlines

Sun 1/256:00 amIAD - OPO

3 stops24h 40mUnited Airlines

Deal found 12/12

$616

Last-minute flights from Porto to Dulles Intl
Discover last-minute flight deals from Porto to Dulles Intl. Data last updated December 15, 2025 and is based on user searches.

Sun 1/1112:30 pmOPO - IAD

2 stops34h 05mUnited Airlines

Sun 1/185:10 pmIAD - OPO

2 stops37h 30mUnited Airlines

Deal found 12/14

$601

Mon 1/1211:15 amOPO - IAD

1 stop33h 50mKLM

Mon 1/196:50 pmIAD - OPO

1 stop10h 40mKLM

Deal found 12/15

$599

Thu 1/157:00 amOPO - IAD

1 stop13h 15mTAP AIR PORTUGAL

Wed 1/2810:30 pmIAD - OPO

1 stop13h 30mTAP AIR PORTUGAL

Deal found 12/15

$508

Thu 1/156:00 amOPO - IAD

1 stop14h 50mUnited Airlines

Wed 1/285:15 pmIAD - OPO

1 stop13h 25mUnited Airlines

Deal found 12/13

$595

Thu 1/156:35 amOPO - IAD

1 stop14h 30mDelta

Wed 1/2812:23 pmIAD - OPO

2 stops17h 07mDelta

Deal found 12/15

$600

Fri 1/2312:30 pmOPO - IAD

1 stop32h 20mUnited Airlines

Sun 1/256:00 amIAD - OPO

3 stops24h 40mUnited Airlines

Deal found 12/12

$616

Wed 1/282:00 pmOPO - IAD

1 stop12h 00mTAP AIR PORTUGAL

Wed 2/410:30 pmIAD - OPO

1 stop9h 35mTAP AIR PORTUGAL

Deal found 12/14

$506

Wed 1/286:45 amOPO - IAD

2 stops16h 45mMultiple Airlines

Wed 2/47:40 pmIAD - OPO

2 stops14h 15mMultiple Airlines

Deal found 12/14

$529

Wed 1/285:00 amOPO - IAD

2 stops19h 09mDelta

Wed 2/46:50 pmIAD - OPO

1 stop10h 40mDelta

Deal found 12/14

$606

One-way flights from Porto to Dulles Intl
Search for one-way flight options from Porto to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated December 15, 2025.

Sun 3/298:40 pmOPO - IAD

1 stop23h 50mIberia

Deal found 12/15

$367

Sun 3/296:00 amOPO - IAD

2 stops18h 00mMultiple Airlines

Deal found 12/15

$431

Sun 3/226:30 amOPO - IAD

2 stops17h 15mMultiple Airlines

Deal found 12/13

$436

Wed 12/248:10 pmOPO - IAD

2 stops53h 50mMultiple Airlines

Deal found 12/14

$482

Sun 3/228:20 amOPO - IAD

1 stop13h 10mIberia

Deal found 12/13

$503

Thu 1/89:00 pmOPO - IAD

3 stops41h 08mMultiple Airlines

Deal found 12/14

$508

Mon 12/227:45 pmOPO - IAD

2 stops54h 15mMultiple Airlines

Deal found 12/14

$512

Tue 12/237:25 amOPO - IAD

2 stops42h 35mMultiple Airlines

Deal found 12/14

$513

Sat 12/2011:15 amOPO - IAD

1 stop12h 30mRoyal Air Maroc

Deal found 12/14

$527

Find flight deals from Porto to Dulles Intl

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$506 (oojo)
One-way from	$367 (Expedia)
Popular in	July
Cheapest in	May
Average price	$626

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

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

Search Deals

From Porto to Washington, D.C. Dulles Intl

Search Deals

One-way flight from Porto 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 ($13 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 Porto to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 1/15

7:00 am-3:15 pm

1 stop13h 15m

Washington, D.C. Dulles Intl

Wed 1/28

10:30 pm-5:00 pm

1 stop13h 30m

$508

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 1/28

6:45 am-6:30 pm

2 stops16h 45m

Washington, D.C. Dulles Intl

Wed 2/4

7:40 pm-2:55 pm

2 stops14h 15m

$529

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 1/15

6:00 am-3:46 pm

2 stops38h 46m

Washington, D.C. Dulles Intl

Wed 1/28

9:45 am-11:15 am

2 stops20h 30m

$595

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 1/15

6:00 am-3:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

Wed 1/28

5:15 pm-11:40 am

1 stop13h 25m

$595

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 1/15

6:00 am-3:46 pm

2 stops38h 46m

Washington, D.C. Dulles Intl

Wed 1/28

9:45 am-11:15 am

2 stops20h 30m

$596

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 1/12

11:15 am-4:05 pm

1 stop33h 50m

Washington, D.C. Dulles Intl

Mon 1/19

6:50 pm-10:30 am

1 stop10h 40m

$599

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 1/15

6:35 am-4:05 pm

1 stop14h 30m

Washington, D.C. Dulles Intl

Wed 1/28

12:23 pm-10:30 am

2 stops17h 07m

$600

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sun 1/11

12:30 pm-5:35 pm

2 stops34h 05m

Washington, D.C. Dulles Intl

Sun 1/18

5:10 pm-11:40 am

2 stops37h 30m

$601

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 1/28

5:00 am-7:09 pm

2 stops19h 09m

Washington, D.C. Dulles Intl

Wed 2/4

6:50 pm-10:30 am

1 stop10h 40m

$606

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 1/23

12:30 pm-3:50 pm

1 stop32h 20m

Washington, D.C. Dulles Intl

Sun 1/25

6:00 am-11:40 am

3 stops24h 40m

$616

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Showing 1-10 of 19 results

Compare providers for flights from Porto to Dulles Intl

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

Provider	Price Accuracy	Trust Score*
eDreams	Price Accuracy3 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star

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

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

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

It’s optimal to fly from Porto to Washington, D.C. Dulles Intl Airport in the afternoon. By choosing this option you can save up to 46% on the cost of your flight, compared to a flight at noon.

Reviews of airlines servicing Dulles Intl

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

TAP AIR PORTUGAL

7.2

Good

2,089 reviews

Reviews

1 / 20

8.0

Excellent

Michael,Dec 2025

FNC - LIS

Long wait standing after checking in at the gate Limited juice selection.

TAP AIR PORTUGAL

7.2

Good

2,089 reviews

TAP AIR PORTUGAL

7.2

Good

2,089 reviews

Reviews

1 / 20

8.0

Excellent

Michael,Dec 2025

FNC - LIS

Long wait standing after checking in at the gate Limited juice selection.

Related info for your journey

What airport do you fly from for flights from Porto to Washington, D.C. Dulles Intl?
Porto (OPO), located 6.8 mi from the city center, is the airport you fly out of when you book flights from Porto to Washington, D.C. Dulles Intl. 1 airline have flights from Porto to Washington, D.C. Dulles Intl on a regular basis. Booking flights from Porto to Washington, D.C. Dulles Intl should not be difficult; the airport handles an average of 0 outbound flights to Washington, D.C. Dulles Intl per day.
How long is the flight from Porto to Washington, D.C. Dulles Intl Airport?
TAP AIR PORTUGAL, Air Canada, and United Airlines can get you from Porto to Washington, D.C. Dulles Intl Airport in just under 13h 15m. Your travel time can differ by up to 25h 31m. Porto and Washington, D.C. Dulles Intl Airport are separated by a distance of 3537 mi. Both multi-stop and nonstop flights can be found to your destination and back.
What is the cheapest airline to fly from Porto to Washington, D.C. Dulles Intl Airport round-trip?
TAP AIR PORTUGAL, at $492, was found to be the cheapest airline from Porto to Washington, D.C. Dulles Intl Airport..
Can I find deals for flights from Porto to Dulles Intl that include hotel bookings?
Yes. In addition to deals on Porto to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Porto to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Porto to Dulles Intl.
Can I find deals for business class flights from Porto to Dulles Intl?
Yes. Cheapflights offers flight deals from Porto 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.

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Top airline flying from Porto to Dulles Intl

Airline	Cheapest	Average	Flexibility	On-time
TAP AIR PORTUGAL	Cheapest$492	Average$804	FlexibilityNo cancel fee	On-timeN/A

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$367+ Cheap flights from Porto (OPO) 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 3/29. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Porto to Dulles Intl with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Porto to Dulles Intl

Cheapest flights from Porto to Dulles IntlExplore the most affordable flight options available from Porto to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

Explore the most affordable flight options available from Porto to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

Find flight deals from Porto to Dulles Intl

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 Porto to Washington, D.C. Dulles Intl Airport that are best for you.

Compare providers for flights from Porto to Dulles Intl

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 Porto to Dulles Intl in December.

Best time to book a flight from Porto to Dulles Intl

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

Cheapflights Insights

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

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

Reviews of airlines servicing Dulles Intl

Get a feel of what it's like to fly with TAP AIR PORTUGAL from Porto to Washington, D.C. Dulles Intl Airport 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 Porto 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 airport do you fly from for flights from Porto to Washington, D.C. Dulles Intl?

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

What is the cheapest airline to fly from Porto to Washington, D.C. Dulles Intl Airport round-trip?

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

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

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

Traveling to a place near Washington, D.C. Dulles Intl Airport?

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 Porto to Dulles Intl

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

Top airline flying from Porto to Dulles Intl

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Cheapest flights from Porto to Dulles Intl
Explore the most affordable flight options available from Porto to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.