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

Delta, at $486, was found to be the cheapest airline from Porto to Washington, D.C. Dulles Intl Airport.Alternate airlines to your destination round-trip include American Airlines and TAP AIR PORTUGAL. Delta is priced at 29% lower than the current average price of a flight leaving 3 months from now.

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

To fly one-way, consider booking your trip with Royal Air Maroc, which is currently one of the cheapest options available, starting at $386. Iberia flights start at $491 while deals on TAP AIR PORTUGAL start at $520 one-way.

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

Currently, August is the cheapest month in which you can book a flight from Porto to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Porto to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $349). 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 day to fly from Porto to Washington, D.C. Dulles Intl Airport?

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

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

Flying to your destination on a Tuesday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to Washington, D.C. Dulles Intl Airport. Check prices with Cheapflights to find a great deal for your trip.

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

The best pricing can be found in the month of May. Prices to Washington, D.C. Dulles Intl Airport from Porto average $719. You can even find prices in May for less than $719, as users have found deals to Washington, D.C. Dulles Intl Airport from as low as $544. The month of June appears to be one of the more expensive times to travel to Washington, D.C. Dulles Intl Airport from Porto. Flying in the targeted month can save you up to 42%.

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.

$386+ Flights from Porto to Washington, D.C. Dulles Intl Airport

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Cheap flight deals from Porto to Dulles Intl

Round-trip from	$486 (Delta)
One-way from	$386 (FlightHub)
Popular in	June
Cheapest in	April
Average price	$805

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. 8% potential increase in price ($63 potential increase over avg. RT price).

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Cheapest flight prices on average. 1% potential price decrease ($13 potential savings vs. average RT price).

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Average for round-trip flights in June 2025

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Find 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 June 12, 2025.

Wed 12/2412:55 pmOPO - IAD

1 stop30h 40mBrussels Airlines

Sat 1/35:45 pmIAD - OPO

1 stop13h 20mBrussels Airlines

Deal found 6/10

$417

Mon 6/236:30 amOPO - IAD

1 stop14h 05mDelta

Wed 7/99:20 pmIAD - OPO

1 stop13h 10mDelta

Deal found 6/12

$486

Wed 10/88:15 amOPO - IAD

1 stop11h 45mAmerican Airlines

Tue 10/214:35 pmIAD - OPO

1 stop14h 05mAmerican Airlines

Deal found 6/11

$491

Wed 10/810:25 pmOPO - IAD

1 stop21h 55mTAP AIR PORTUGAL

Tue 10/215:00 pmIAD - OPO

1 stop16h 05mTAP AIR PORTUGAL

Deal found 6/12

$492

Sun 6/224:20 pmOPO - IAD

1 stop28h 15mKLM

Mon 7/75:25 pmIAD - OPO

1 stop17h 10mKLM

Deal found 6/12

$493

Wed 12/246:00 amOPO - IAD

1 stop14h 50mLufthansa

Sat 1/311:10 pmIAD - OPO

1 stop19h 35mLufthansa

Deal found 6/10

$581

Wed 10/86:00 amOPO - IAD

2 stops20h 05mAir Canada

Tue 10/219:45 amIAD - OPO

2 stops25h 00mAir Canada

Deal found 6/10

$583

Wed 12/247:20 pmOPO - IAD

2 stops24h 15mMultiple Airlines

Sat 1/311:10 pmIAD - OPO

1 stop19h 35mMultiple Airlines

Deal found 6/12

$621

Sun 8/39:25 pmOPO - IAD

1 stop25h 10mBritish Airways

Tue 8/194:35 pmIAD - OPO

1 stop18h 20mBritish Airways

Deal found 6/10

$648

Wed 7/236:00 amOPO - IAD

2 stops34h 39mUnited Airlines

Wed 7/309:45 amIAD - OPO

1 stop18h 35mUnited Airlines

Deal found 6/10

$652

Wed 7/308:40 amOPO - IAD

1 stop12h 35mSWISS

Wed 8/205:45 pmIAD - OPO

1 stop12h 40mSWISS

Deal found 6/10

$787

Mon 7/2810:25 amOPO - IAD

1 stop33h 10mAustrian Airlines

Mon 8/185:25 pmIAD - OPO

1 stop14h 15mAustrian Airlines

Deal found 6/10

$1,014

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 June 12, 2025.

Mon 6/236:30 amOPO - IAD

1 stop14h 05mDelta

Wed 7/99:20 pmIAD - OPO

1 stop13h 10mDelta

Deal found 6/12

$486

Wed 10/88:15 amOPO - IAD

1 stop11h 45mAmerican Airlines

Tue 10/214:35 pmIAD - OPO

1 stop14h 05mAmerican Airlines

Deal found 6/11

$491

Wed 10/810:25 pmOPO - IAD

1 stop21h 55mTAP AIR PORTUGAL

Tue 10/215:00 pmIAD - OPO

1 stop16h 05mTAP AIR PORTUGAL

Deal found 6/12

$492

Sun 6/224:20 pmOPO - IAD

1 stop28h 15mKLM

Mon 7/75:25 pmIAD - OPO

1 stop17h 10mKLM

Deal found 6/12

$493

Wed 10/86:00 amOPO - IAD

2 stops20h 05mAir Canada

Tue 10/219:45 amIAD - OPO

2 stops25h 00mAir Canada

Deal found 6/10

$583

Wed 10/86:00 amOPO - IAD

1 stop14h 50mLufthansa

Tue 10/2110:20 pmIAD - OPO

2 stops19h 30mLufthansa

Deal found 6/10

$590

Sun 8/39:25 pmOPO - IAD

1 stop25h 10mBritish Airways

Tue 8/194:35 pmIAD - OPO

1 stop18h 20mBritish Airways

Deal found 6/10

$648

Wed 7/236:00 amOPO - IAD

2 stops34h 39mUnited Airlines

Wed 7/309:45 amIAD - OPO

1 stop18h 35mUnited Airlines

Deal found 6/10

$652

Tue 7/88:00 pmOPO - IAD

2 stops25h 15mMultiple Airlines

Sat 9/610:20 pmIAD - OPO

1 stop20h 00mMultiple Airlines

Deal found 6/11

$660

Wed 7/308:40 amOPO - IAD

1 stop12h 35mSWISS

Sat 8/168:45 pmIAD - OPO

1 stop16h 45mSWISS

Deal found 6/10

$787

Mon 7/2810:25 amOPO - IAD

1 stop33h 10mAustrian Airlines

Mon 8/185:25 pmIAD - OPO

1 stop14h 15mAustrian Airlines

Deal found 6/10

$1,014

Sat 8/210:35 amOPO - IAD

1 stop13h 30mRoyal Air Maroc

Sat 8/169:05 pmIAD - OPO

2 stops37h 50mRoyal Air Maroc

Deal found 6/10

$1,950

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

Tue 6/1712:50 pmOPO - IAD

1 stop13h 18mMultiple Airlines

Tue 6/248:45 pmIAD - OPO

1 stop33h 40mMultiple Airlines

Deal found 6/11

$734

Tue 6/178:40 amOPO - IAD

2 stops17h 47mAir Canada

Thu 10/168:28 amIAD - OPO

2 stops29h 02mAir Canada

Deal found 6/9

$2,350

Tue 6/1711:55 amOPO - IAD

1 stop13h 55mTAP AIR PORTUGAL

Thu 10/165:50 pmIAD - OPO

1 stop10h 20mTAP AIR PORTUGAL

Deal found 6/9

$3,799

Wed 6/1812:20 pmOPO - IAD

1 stop31h 40mAmerican Airlines

Wed 6/251:08 pmIAD - OPO

2 stops13h 27mAmerican Airlines

Deal found 6/11

$880

Wed 6/188:40 amOPO - IAD

1 stop12h 35mSWISS

Mon 10/208:45 pmIAD - OPO

1 stop19h 45mSWISS

Deal found 6/9

$2,342

Thu 6/1911:05 amOPO - IAD

1 stop13h 20mLufthansa

Tue 10/1410:20 pmIAD - OPO

1 stop20h 00mLufthansa

Deal found 6/9

$2,344

Fri 6/209:00 amOPO - IAD

1 stop12h 25mUnited Airlines

Sat 10/1812:35 pmIAD - OPO

2 stops22h 10mUnited Airlines

Deal found 6/9

$2,357

Sun 6/224:20 pmOPO - IAD

1 stop28h 15mKLM

Mon 7/75:25 pmIAD - OPO

1 stop17h 10mKLM

Deal found 6/12

$493

Sun 6/225:00 amOPO - IAD

1 stop15h 35mDelta

Mon 7/78:31 pmIAD - OPO

2 stops16h 24mDelta

Deal found 6/12

$551

Sun 6/226:35 pmOPO - IAD

2 stops50h 34mAustrian Airlines

Mon 10/205:25 pmIAD - OPO

1 stop14h 15mAustrian Airlines

Deal found 6/9

$2,352

Sun 6/2210:45 amOPO - IAD

1 stop30h 00mTurkish Airlines

Tue 10/149:40 pmIAD - OPO

1 stop31h 25mTurkish Airlines

Deal found 6/9

$3,122

Mon 6/236:30 amOPO - IAD

1 stop14h 05mDelta

Wed 7/99:20 pmIAD - OPO

1 stop13h 10mDelta

Deal found 6/12

$486

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 June 12, 2025.

Sun 10/197:00 pmOPO - IAD

1 stop29h 05mRoyal Air Maroc

Deal found 6/12

$386

Tue 7/81:30 pmOPO - IAD

1 stop30h 26mMultiple Airlines

Deal found 6/10

$430

Tue 10/218:15 amOPO - IAD

1 stop11h 45mIberia

Deal found 6/10

$491

Thu 10/212:25 pmOPO - IAD

1 stop13h 25mTAP AIR PORTUGAL

Deal found 6/9

$520

Tue 9/238:15 amOPO - IAD

1 stop11h 45mAmerican Airlines

Deal found 6/11

$537

Thu 10/28:15 amOPO - IAD

2 stops16h 27mBritish Airways

Deal found 6/9

$543

Tue 9/236:15 amOPO - IAD

2 stops15h 16mKLM

Deal found 6/11

$606

Mon 9/86:30 amOPO - IAD

2 stops18h 13mDelta

Deal found 6/10

$610

Tue 7/110:50 amOPO - IAD

1 stop29h 55mTurkish Airlines

Deal found 6/11

$658

Thu 7/248:40 amOPO - IAD

1 stop12h 35mSWISS

Deal found 6/11

$667

Sun 9/76:15 amOPO - IAD

2 stops14h 35mLufthansa

Deal found 6/10

$693

Mon 7/79:00 amOPO - IAD

1 stop12h 20mUnited Airlines

Deal found 6/12

$959

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

Mon 6/23

6:30 am-3:35 pm

1 stop14h 05m

Washington, D.C. Dulles Intl

Wed 7/9

9:20 pm-3:30 pm

1 stop13h 10m

$486

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 10/8

8:15 am-3:00 pm

1 stop11h 45m

Washington, D.C. Dulles Intl

Tue 10/21

4:35 pm-11:40 am

1 stop14h 05m

$491

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 10/8

10:25 pm-3:20 pm

1 stop21h 55m

Washington, D.C. Dulles Intl

Tue 10/21

5:00 pm-2:05 pm

1 stop16h 05m

$492

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sun 6/22

4:20 pm-3:35 pm

1 stop28h 15m

Washington, D.C. Dulles Intl

Mon 7/7

5:25 pm-3:35 pm

1 stop17h 10m

$493

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 10/8

6:00 am-9:05 pm

2 stops20h 05m

Washington, D.C. Dulles Intl

Tue 10/21

9:45 am-3:45 pm

2 stops25h 00m

$583

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 10/8

6:00 am-3:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

Tue 10/21

10:20 pm-10:50 pm

2 stops19h 30m

$590

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sun 8/3

9:25 pm-5:35 pm

1 stop25h 10m

Washington, D.C. Dulles Intl

Tue 8/19

4:35 pm-3:55 pm

1 stop18h 20m

$648

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 7/23

6:00 am-11:39 am

2 stops34h 39m

Washington, D.C. Dulles Intl

Wed 7/30

9:45 am-9:20 am

1 stop18h 35m

$652

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 7/8

8:00 pm-4:15 pm

2 stops25h 15m

Washington, D.C. Dulles Intl

Sat 9/6

10:20 pm-11:20 pm

1 stop20h 00m

$660

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 7/30

8:40 am-4:15 pm

1 stop12h 35m

Washington, D.C. Dulles Intl

Sat 8/16

8:45 pm-6:30 pm

1 stop16h 45m

$787

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 26 results

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?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Porto to Washington, D.C. Dulles Intl Airport as you normally would.

Rainfall in Dulles Intl by month

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.

Temperature in Dulles Intl by month

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).

Reviews of airlines servicing Dulles Intl

To help decide which airline to fly from Porto to Washington, D.C., see what other customers have to say about Delta, KLM and Austrian Airlines. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,946 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very good

7,946 reviews

Delta

8.0

Very good

7,946 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

KLM

7.8

Good

1,358 reviews

Delta

8.0

Very good

7,946 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Austrian Airlines

7.6

Good

802 reviews

Delta

8.0

Very good

7,946 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

SWISS

7.5

Good

1,623 reviews

Delta

8.0

Very good

7,946 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

United Airlines

7.4

Good

8,790 reviews

Delta

8.0

Very good

7,946 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.
What are the cheapest airlines flying from Porto to Washington, D.C. Dulles Intl Airport round-trip?
Delta, at $486, was found to be the cheapest airline from Porto to Washington, D.C. Dulles Intl Airport.Alternate airlines to your destination round-trip include American Airlines and TAP AIR PORTUGAL. Delta is priced at 29% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from Porto to Washington, D.C. Dulles Intl Airport one-way?
To fly one-way, consider booking your trip with Royal Air Maroc, which is currently one of the cheapest options available, starting at $386. Iberia flights start at $491 while deals on TAP AIR PORTUGAL start at $520 one-way.
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.
What is the cheapest month to book a flight from Porto to Washington, D.C. Dulles Intl Airport?
Currently, August is the cheapest month in which you can book a flight from Porto to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Porto to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $349). 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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Reston

National Harbor

Springfield

Manassas

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Porto to Dulles Intl

Airline	Cheapest	Average	Flexibility	On-time
TAP AIR PORTUGAL	Cheapest$480	Average$751	FlexibilityNo cancel fee	On-timeN/A

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$386+ 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 10/19. 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

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Find 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 June 12, 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 June 12, 2025.

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.

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?

Find hourly flight availability from Porto 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 June 12, 2025.

Rainfall in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average rainfall totals by month.

Temperature in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average temperature totals by month.

Reviews of airlines servicing Dulles Intl

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?

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

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

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?

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

Traveling to a place near Porto?

Browse thousands of different options on Cheapflights for your next trip

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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 June 12, 2025.