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

Currently priced at $511, British Airways will fly you from Washington, D.C. Dulles Intl Airport to Porto and back. In addition to British Airways, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Air Canada and TAP AIR PORTUGAL - these airlines can fly you to your destination from $653 and $659, respectively. These flights start at 29% 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?

$459 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 Air Canada and Delta, with prices starting from $528 and $547, respectively.

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

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

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

Consider American Airlines, Air France or Delta when booking your flight. These represent the most popular airlines when flying from Washington, D.C. Dulles Intl Airport to Porto.

Where are the most common layover locations when flying from Washington, D.C. Dulles Intl Airport to Porto?

Flights departing from Washington, D.C. Dulles Intl Airport and landing in Porto layover in Lisbon most frequently.

Where are the least popular layover locations for Washington, D.C. Dulles Intl Airport to Porto flights?

Washington, D.C. Dulles Intl Airport to Porto flights have a layover in Madrid least often.

What are some popular things to do or see while on a layover in Lisbon?

Most Lisbon visitors opt to spend their time experiencing Chiado, Praça do Marquês de Pombal, and Centro Cultural de Belém. Travelers on a layover in Lisbon can visit Chiado, Praça do Marquês de Pombal, and Centro Cultural de Belém, by traveling 4.5 mi, 3.6 mi, and 6.8 mi, respectively after landing at Lisbon Humberto Delgado. Travelers can book a car rental at Lisbon Humberto Delgado for about $21 per day to make their sightseeing more efficient.

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

Flying to your destination on a Thursday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to Porto. Check prices with Cheapflights to find a great deal for your trip.

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

November is one of the best times of the year to fly to Porto from Washington, D.C. Dulles Intl Airport. Prices for November average $671 per person but you can even find prices for as low as $418. The most expensive prices can be found in the month of June. Opting for a November flight can save you 30% on your journey compared to booking in June

Most accurate provider : When it comes to deals on Washington, D.C. Dulles Intl Airport-Porto flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Washington, D.C. Dulles Intl Airport-Porto flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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 8 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.

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

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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Porto are usually found in February or October, booked 58 days in advance, depart on a Sunday or Saturday and return on a Monday

Cheap flight deals from Dulles Intl to Porto

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$511 (Booking.com)
One-way from	$367 (Kiwi.com)
Popular in	June
Cheapest in	February
Average price	$697

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

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

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From Washington, D.C. Dulles Intl to Porto

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

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Highest demand for flights based on searches. 19% potential increase in price ($177 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($21 potential savings vs. average RT price).

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Average for round-trip flights in April 2025

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Find 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 April 16, 2025.

Mon 6/210:40 pmIAD - OPO

2 stops27h 55mBritish Airways

Wed 6/1812:20 pmOPO - IAD

1 stop31h 40mBritish Airways

Deal found 4/15

$511

Sun 9/2110:20 pmIAD - OPO

1 stop15h 40mTAP AIR PORTUGAL

Sun 9/2810:30 pmOPO - IAD

1 stop21h 50mTAP AIR PORTUGAL

Deal found 4/15

$563

Tue 5/138:45 pmIAD - OPO

1 stop30h 00mMultiple Airlines

Tue 5/206:00 amOPO - IAD

2 stops20h 08mMultiple Airlines

Deal found 4/15

$631

Tue 9/1610:10 pmIAD - OPO

2 stops30h 15mAir Canada

Tue 9/3012:50 pmOPO - IAD

1 stop13h 11mAir Canada

Deal found 4/15

$642

Wed 8/208:15 amIAD - OPO

2 stops20h 05mUnited Airlines

Wed 8/276:00 amOPO - IAD

1 stop14h 50mUnited Airlines

Deal found 4/15

$652

Wed 4/238:45 pmIAD - OPO

1 stop30h 10mSWISS

Thu 5/18:40 amOPO - IAD

1 stop12h 35mSWISS

Deal found 4/15

$661

Tue 4/226:30 pmIAD - OPO

1 stop16h 00mDelta

Mon 4/2811:25 amOPO - IAD

1 stop33h 10mDelta

Deal found 4/15

$664

Mon 6/305:25 pmIAD - OPO

1 stop17h 10mKLM

Mon 7/76:25 pmOPO - IAD

1 stop26h 10mKLM

Deal found 4/15

$688

Sat 6/79:20 pmIAD - OPO

1 stop13h 10mAir France

Fri 11/2111:45 amOPO - IAD

2 stops16h 15mAir France

Deal found 4/15

$701

Tue 4/226:10 pmIAD - OPO

1 stop12h 05mLufthansa

Mon 4/286:15 amOPO - IAD

2 stops14h 35mLufthansa

Deal found 4/15

$710

Fri 5/304:20 pmIAD - OPO

2 stops33h 25mPorter Airlines

Fri 6/68:25 amOPO - IAD

2 stops35h 41mPorter Airlines

Deal found 4/15

$804

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 April 16, 2025.

Mon 6/210:40 pmIAD - OPO

2 stops27h 55mBritish Airways

Wed 6/1812:20 pmOPO - IAD

1 stop31h 40mBritish Airways

Deal found 4/15

$511

Tue 5/138:45 pmIAD - OPO

1 stop30h 00mMultiple Airlines

Tue 5/206:00 amOPO - IAD

2 stops20h 08mMultiple Airlines

Deal found 4/15

$631

Sun 5/49:45 amIAD - OPO

2 stops27h 30mAir Canada

Tue 5/136:00 amOPO - IAD

2 stops20h 08mAir Canada

Deal found 4/15

$653

Wed 5/2810:20 pmIAD - OPO

1 stop19h 50mTAP AIR PORTUGAL

Wed 6/48:55 amOPO - IAD

1 stop16h 55mTAP AIR PORTUGAL

Deal found 4/16

$659

Wed 4/238:45 pmIAD - OPO

1 stop30h 10mSWISS

Tue 4/2912:15 pmOPO - IAD

1 stop33h 00mSWISS

Deal found 4/15

$661

Tue 4/226:30 pmIAD - OPO

1 stop16h 00mDelta

Mon 4/2811:25 amOPO - IAD

1 stop33h 10mDelta

Deal found 4/15

$664

Tue 7/15:10 pmIAD - OPO

2 stops35h 10mUnited Airlines

Tue 7/1512:50 pmOPO - IAD

2 stops32h 20mUnited Airlines

Deal found 4/15

$665

Tue 7/19:20 pmIAD - OPO

1 stop13h 10mKLM

Mon 7/74:20 pmOPO - IAD

1 stop28h 15mKLM

Deal found 4/15

$682

Sat 6/76:30 pmIAD - OPO

1 stop16h 00mAir France

Thu 11/2011:45 amOPO - IAD

2 stops16h 15mAir France

Deal found 4/15

$701

Tue 4/226:10 pmIAD - OPO

1 stop12h 05mLufthansa

Mon 4/286:15 amOPO - IAD

2 stops14h 35mLufthansa

Deal found 4/15

$710

Fri 5/304:20 pmIAD - OPO

2 stops33h 25mPorter Airlines

Fri 6/68:25 amOPO - IAD

2 stops35h 41mPorter Airlines

Deal found 4/15

$804

Last-minute flights from Dulles Intl to Porto
Discover last-minute flight deals from Dulles Intl to Porto. Data last updated April 16, 2025 and is based on user searches.

Mon 4/215:25 pmIAD - OPO

1 stop14h 50mAustrian Airlines

Mon 4/2810:25 amOPO - IAD

1 stop33h 10mAustrian Airlines

Deal found 4/15

$899

Mon 4/2110:20 pmIAD - OPO

1 stop11h 40mTAP AIR PORTUGAL

Wed 4/3010:25 pmOPO - IAD

1 stop21h 55mTAP AIR PORTUGAL

Deal found 4/15

$1,036

Mon 4/2110:05 pmIAD - OPO

2 stops19h 10mScandinavian Airlines

Mon 4/2812:00 pmOPO - IAD

1 stop12h 59mScandinavian Airlines

Deal found 4/15

$1,083

Tue 4/226:30 pmIAD - OPO

1 stop16h 00mDelta

Mon 4/2811:25 amOPO - IAD

1 stop33h 10mDelta

Deal found 4/15

$664

Tue 4/226:10 pmIAD - OPO

1 stop12h 05mLufthansa

Mon 4/286:15 amOPO - IAD

2 stops14h 35mLufthansa

Deal found 4/15

$710

Tue 4/221:30 pmIAD - OPO

1 stop21h 20mTurkish Airlines

Sat 4/2610:45 amOPO - IAD

1 stop30h 00mTurkish Airlines

Deal found 4/15

$1,571

Wed 4/238:45 pmIAD - OPO

1 stop30h 10mSWISS

Tue 4/2912:15 pmOPO - IAD

1 stop33h 00mSWISS

Deal found 4/15

$661

Wed 4/2312:45 pmIAD - OPO

2 stops22h 00mUnited Airlines

Thu 5/16:00 amOPO - IAD

2 stops22h 59mUnited Airlines

Deal found 4/15

$687

Wed 4/234:35 pmIAD - OPO

1 stop10h 00mIberia

Thu 5/88:15 amOPO - IAD

1 stop11h 45mIberia

Deal found 4/16

$852

Wed 4/238:45 pmIAD - OPO

1 stop30h 10mSWISS

Thu 5/18:40 amOPO - IAD

1 stop12h 35mSWISS

Deal found 4/15

$661

Wed 4/2312:45 pmIAD - OPO

2 stops22h 00mUnited Airlines

Wed 4/306:00 amOPO - IAD

2 stops18h 17mUnited Airlines

Deal found 4/15

$687

Sat 4/265:35 pmIAD - OPO

1 stop17h 25mMultiple Airlines

Fri 5/212:15 pmOPO - IAD

1 stop33h 00mMultiple Airlines

Deal found 4/15

$793

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 April 16, 2025.

Thu 4/248:30 pmIAD - OPO

3 stops43h 55mMultiple Airlines

Deal found 4/15

$367

Mon 6/210:20 pmIAD - OPO

1 stop13h 40mTAP AIR PORTUGAL

Deal found 4/15

$459

Mon 6/308:18 amIAD - OPO

2 stops20h 17mAir Canada

Deal found 4/15

$528

Mon 4/216:30 pmIAD - OPO

1 stop16h 00mDelta

Deal found 4/15

$547

Mon 6/163:40 pmIAD - OPO

1 stop10h 15mUnited Airlines

Deal found 4/15

$554

Sat 5/1710:45 pmIAD - OPO

1 stop16h 50mBritish Airways

Deal found 4/15

$596

Thu 5/228:45 pmIAD - OPO

1 stop16h 45mSWISS

Deal found 4/15

$640

Sun 4/2011:05 pmIAD - OPO

2 stops18h 45mLufthansa

Deal found 4/14

$732

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

Mon 6/2

10:40 pm-7:35 am

2 stops27h 55m

Porto

Wed 6/18

12:20 pm-3:00 pm

1 stop31h 40m

$511

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 5/13

8:45 pm-7:45 am

1 stop30h 00m

Porto

Tue 5/20

6:00 am-9:08 pm

2 stops20h 08m

$631

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 5/4

9:45 am-6:15 pm

2 stops27h 30m

Porto

Tue 5/13

6:00 am-9:08 pm

2 stops20h 08m

$653

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 5/28

10:20 pm-11:10 pm

1 stop19h 50m

Porto

Wed 6/4

8:55 am-8:50 pm

1 stop16h 55m

$659

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 4/23

8:45 pm-7:55 am

1 stop30h 10m

Porto

Tue 4/29

12:15 pm-4:15 pm

1 stop33h 00m

$661

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 4/22

6:30 pm-3:30 pm

1 stop16h 00m

Porto

Mon 4/28

11:25 am-3:35 pm

1 stop33h 10m

$664

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 7/1

5:10 pm-9:20 am

2 stops35h 10m

Porto

Tue 7/15

12:50 pm-4:10 pm

2 stops32h 20m

$665

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 7/1

9:20 pm-3:30 pm

1 stop13h 10m

Porto

Mon 7/7

4:20 pm-3:35 pm

1 stop28h 15m

$682

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sat 6/7

6:30 pm-3:30 pm

1 stop16h 00m

Porto

Thu 11/20

11:45 am-11:00 pm

2 stops16h 15m

$701

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 4/22

6:10 pm-11:15 am

1 stop12h 05m

Porto

Mon 4/28

6:15 am-3:50 pm

2 stops14h 35m

$710

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Showing 1-10 of 19 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 April.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*2 stars
AranGrant	Price Accuracy3 stars	Trust Score*3 stars
Flightnetwork	Price Accuracy2 stars	Trust Score*3 stars
FlightsMojo	Price Accuracy-	Trust Score*3 stars
Trip.com	Price Accuracy1 star	Trust Score*3 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 AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Washington, D.C. Dulles Intl Airport-Porto flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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 58 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, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Porto (average of $523). Flying from Washington, D.C. Dulles Intl Airport to Porto in June is currently the most expensive (average of $1,081). 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 in the morning. Doing so could potentially save you 23% on the flight price compared to flying in the afternoon, which is usually more expensive.

Rainfall in Porto by month

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.

Temperature in Porto by month

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).

Reviews of airlines servicing Porto

To help decide which airline to fly from Washington, D.C. to Porto, see what other customers have to say about Porter Airlines, Delta and KLM. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Porter Airlines

8.0

Very good

281 reviews

Reviews

1 / 17

10.0

Excellent

Anonymous,Dec 2024

YYZ - LAS

Everything about the rescheduled (cost me $180) flight great. ***Being denied boarding because I was few minutes under 1.5 hours was not. Stuck at the Kiosk for about 15 minutes before it directed me to the Porter counter was strange. Do not know why checking in online at home was not successful? I think something was up...what can you do?

Porter Airlines

8.0

Very good

281 reviews

Porter Airlines

8.0

Very good

281 reviews

Reviews

1 / 17

10.0

Excellent

Anonymous,Dec 2024

YYZ - LAS

Delta

8.0

Very good

7,916 reviews

Porter Airlines

8.0

Very good

281 reviews

Reviews

1 / 17

10.0

Excellent

Anonymous,Dec 2024

YYZ - LAS

KLM

7.8

Good

1,326 reviews

Porter Airlines

8.0

Very good

281 reviews

Reviews

1 / 17

10.0

Excellent

Anonymous,Dec 2024

YYZ - LAS

Air France

7.5

Good

1,435 reviews

Porter Airlines

8.0

Very good

281 reviews

Reviews

1 / 17

10.0

Excellent

Anonymous,Dec 2024

YYZ - LAS

SWISS

7.5

Good

1,580 reviews

Porter Airlines

8.0

Very good

281 reviews

Reviews

1 / 17

10.0

Excellent

Anonymous,Dec 2024

YYZ - LAS

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 8 different airlines.
What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to Porto round-trip?
Currently priced at $511, British Airways will fly you from Washington, D.C. Dulles Intl Airport to Porto and back. In addition to British Airways, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Air Canada and TAP AIR PORTUGAL - these airlines can fly you to your destination from $653 and $659, respectively. These flights start at 29% 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?
$459 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 Air Canada and Delta, with prices starting from $528 and $547, respectively.
Where are the most common layover locations when flying from Washington, D.C. Dulles Intl Airport to Porto?
Flights departing from Washington, D.C. Dulles Intl Airport and landing in Porto layover in Lisbon most frequently.
What are some popular things to do or see while on a layover in Lisbon?
Most Lisbon visitors opt to spend their time experiencing Chiado, Praça do Marquês de Pombal, and Centro Cultural de Belém. Travelers on a layover in Lisbon can visit Chiado, Praça do Marquês de Pombal, and Centro Cultural de Belém, by traveling 4.5 mi, 3.6 mi, and 6.8 mi, respectively after landing at Lisbon Humberto Delgado. Travelers can book a car rental at Lisbon Humberto Delgado for about $21 per day to make their sightseeing more efficient.
Where are the least popular layover locations for Washington, D.C. Dulles Intl Airport to Porto flights?
Washington, D.C. Dulles Intl Airport to Porto flights have a layover in Madrid least often.
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, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Porto (average of $523). Flying from Washington, D.C. Dulles Intl Airport to Porto in June is currently the most expensive (average of $1,081). 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

Coimbra

Matosinhos

Arcos de Valdevez

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Top 8 airlines flying from Dulles Intl to Porto

Airline	Cheapest	Average	Flexibility	On-time
Air France	Cheapest$422	Average$818	FlexibilityNo cancel fee	On-time77%
Delta	Cheapest$423	Average$808	FlexibilityNo cancel fee	On-timeN/A
KLM	Cheapest$435	Average$663	FlexibilityNo cancel fee	On-time75%
TAP AIR PORTUGAL	Cheapest$457	Average$748	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$538	Average$915	FlexibilityNo cancel fee	On-time69%
Lufthansa	Cheapest$538	Average$754	FlexibilityNo cancel fee	On-time76%
American Airlines	Cheapest$567	Average$828	FlexibilityNo cancel fee	On-time71%
Iberia	Cheapest$579	Average$798	FlexibilityNo cancel fee	On-time77%

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$367+ 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 4/24. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Porto are usually found in February or October, booked 58 days in advance, depart on a Sunday or Saturday and return on a Monday

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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 April 16, 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 April 16, 2025.

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Best time to book a flight from Dulles Intl to Porto

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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?

Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to Porto. Price data was last updated on April 11, 2025.

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?

Find hourly flight availability from Dulles Intl to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 16, 2025.

Rainfall in Porto by month

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Temperature in Porto by month

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Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. 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 Porto. Reviews last updated April 16, 2025.

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?

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?

Where are the most common layover locations when flying from Washington, D.C. Dulles Intl Airport to Porto?

What are some popular things to do or see while on a layover in Lisbon?

Where are the least popular layover locations for Washington, D.C. Dulles Intl Airport to Porto flights?

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

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

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Top 8 airlines flying from Dulles Intl to Porto

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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 April 16, 2025.