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

Currently priced at $568, Turkish Airlines will fly you from Washington, D.C. Dulles Intl Airport to Porto and back. In addition to Turkish Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Lufthansa and Air Canada - these airlines can fly you to your destination from $569 and $578, respectively. These flights start at 22% 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?

$255 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 United Airlines and Air Canada, with prices starting from $359 and $365, 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.

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

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 $684 per person but you can even find prices for as low as $423. The most expensive prices can be found in the month of June. Opting for a November flight can save you 29% on your journey compared to booking in June

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.

$249+ 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 78 days in advance, depart on a Sunday or Saturday and return on a Monday

Cheap flight deals from Dulles Intl to Porto

Round-trip from	$568 (FlightHub)
One-way from	$249 (Mytrip)
Popular in	December
Cheapest in	February
Average price	$883

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. 4% potential increase in price ($31 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).

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Average for round-trip flights in July 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 July 29, 2025.

Tue 10/144:35 pmIAD - OPO

1 stop14h 05mIberia

Tue 10/288:40 pmOPO - IAD

2 stops28h 15mIberia

Deal found 7/28

$568

Tue 10/1410:20 pmIAD - OPO

1 stop20h 00mLufthansa

Tue 10/2812:30 pmOPO - IAD

1 stop32h 20mLufthansa

Deal found 7/28

$569

Mon 8/189:45 amIAD - OPO

1 stop18h 50mMultiple Airlines

Tue 8/266:00 amOPO - IAD

1 stop14h 50mMultiple Airlines

Deal found 7/29

$574

Wed 8/2012:35 pmIAD - OPO

2 stops15h 45mAir Canada

Thu 9/412:10 pmOPO - IAD

2 stops33h 18mAir Canada

Deal found 7/28

$578

Tue 10/148:09 amIAD - OPO

2 stops18h 26mAmerican Airlines

Thu 10/238:15 amOPO - IAD

1 stop11h 45mAmerican Airlines

Deal found 7/29

$579

Wed 8/208:55 amIAD - OPO

2 stops19h 25mUnited Airlines

Fri 9/56:00 amOPO - IAD

1 stop14h 50mUnited Airlines

Deal found 7/27

$580

Mon 9/155:45 pmIAD - OPO

1 stop18h 15mTAP AIR PORTUGAL

Mon 9/2210:35 pmOPO - IAD

1 stop21h 45mTAP AIR PORTUGAL

Deal found 7/27

$582

Sat 10/251:00 pmIAD - OPO

2 stops17h 30mDelta

Tue 11/46:05 amOPO - IAD

2 stops15h 26mDelta

Deal found 7/27

$592

Tue 9/238:45 pmIAD - OPO

2 stops17h 20mSWISS

Tue 9/308:40 amOPO - IAD

1 stop12h 35mSWISS

Deal found 7/29

$595

Mon 10/201:30 pmIAD - OPO

1 stop21h 20mTurkish Airlines

Sat 10/2510:45 amOPO - IAD

1 stop38h 30mTurkish Airlines

Deal found 7/29

$623

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 July 29, 2025.

Wed 10/11:30 pmIAD - OPO

1 stop21h 20mTurkish Airlines

Wed 10/84:50 pmOPO - IAD

1 stop23h 55mTurkish Airlines

Deal found 7/29

$568

Tue 10/1410:20 pmIAD - OPO

1 stop20h 00mLufthansa

Tue 10/2812:30 pmOPO - IAD

1 stop32h 20mLufthansa

Deal found 7/28

$569

Mon 8/189:45 amIAD - OPO

1 stop18h 50mMultiple Airlines

Tue 8/266:00 amOPO - IAD

1 stop14h 50mMultiple Airlines

Deal found 7/29

$574

Wed 8/2012:35 pmIAD - OPO

2 stops15h 45mAir Canada

Thu 9/412:10 pmOPO - IAD

2 stops33h 18mAir Canada

Deal found 7/28

$578

Tue 10/148:09 amIAD - OPO

2 stops18h 26mAmerican Airlines

Thu 10/238:15 amOPO - IAD

1 stop11h 45mAmerican Airlines

Deal found 7/29

$579

Wed 8/208:55 amIAD - OPO

2 stops19h 25mUnited Airlines

Fri 9/56:00 amOPO - IAD

1 stop14h 50mUnited Airlines

Deal found 7/27

$580

Mon 9/155:45 pmIAD - OPO

1 stop18h 15mTAP AIR PORTUGAL

Mon 9/2210:35 pmOPO - IAD

1 stop21h 45mTAP AIR PORTUGAL

Deal found 7/27

$582

Sun 8/174:35 pmIAD - OPO

1 stop14h 05mIberia

Wed 9/38:15 amOPO - IAD

1 stop11h 45mIberia

Deal found 7/27

$589

Sat 10/251:00 pmIAD - OPO

2 stops17h 30mDelta

Tue 11/46:05 amOPO - IAD

2 stops15h 26mDelta

Deal found 7/27

$592

Tue 9/238:45 pmIAD - OPO

2 stops17h 20mSWISS

Tue 9/308:40 amOPO - IAD

1 stop12h 35mSWISS

Deal found 7/29

$595

Mon 8/116:30 pmIAD - OPO

1 stop16h 00mKLM

Tue 8/194:20 pmOPO - IAD

1 stop28h 15mKLM

Deal found 7/28

$632

Last-minute flights from Dulles Intl to Porto
Discover last-minute flight deals from Dulles Intl to Porto. Data last updated July 29, 2025 and is based on user searches.

Mon 8/410:20 pmIAD - OPO

1 stop15h 40mTAP AIR PORTUGAL

Sun 8/106:00 amOPO - IAD

1 stop14h 20mTAP AIR PORTUGAL

Deal found 7/28

$1,046

Mon 8/48:20 amIAD - OPO

2 stops20h 15mUnited Airlines

Sun 8/106:00 amOPO - IAD

1 stop14h 15mUnited Airlines

Deal found 7/28

$1,095

Mon 8/44:35 pmIAD - OPO

1 stop14h 05mIberia

Fri 8/88:15 amOPO - IAD

1 stop11h 45mIberia

Deal found 7/27

$1,098

Mon 8/410:20 amIAD - OPO

2 stops18h 15mAir Canada

Sun 8/1011:20 amOPO - IAD

2 stops31h 22mAir Canada

Deal found 7/28

$1,370

Mon 8/48:45 pmIAD - OPO

1 stop33h 45mSWISS

Sat 8/93:05 amOPO - IAD

1 stop18h 10mSWISS

Deal found 7/28

$1,485

Fri 8/85:25 pmIAD - OPO

1 stop17h 10mKLM

Mon 8/119:20 amOPO - IAD

2 stops17h 22mKLM

Deal found 7/28

$805

Fri 8/82:25 pmIAD - OPO

2 stops15h 00mMultiple Airlines

Mon 8/117:25 pmOPO - IAD

2 stops25h 25mMultiple Airlines

Deal found 7/28

$983

Fri 8/810:20 pmIAD - OPO

1 stop20h 00mLufthansa

Mon 8/1111:05 amOPO - IAD

2 stops33h 45mLufthansa

Deal found 7/28

$1,176

Fri 8/88:31 pmIAD - OPO

2 stops16h 44mDelta

Sun 8/179:20 amOPO - IAD

1 stop14h 55mDelta

Deal found 7/28

$1,223

Mon 8/116:30 pmIAD - OPO

1 stop16h 00mKLM

Tue 8/194:20 pmOPO - IAD

1 stop28h 15mKLM

Deal found 7/28

$632

Sun 8/174:35 pmIAD - OPO

1 stop14h 05mIberia

Wed 9/38:15 amOPO - IAD

1 stop11h 45mIberia

Deal found 7/27

$589

Sun 8/1710:20 pmIAD - OPO

1 stop20h 00mLufthansa

Fri 9/56:15 amOPO - IAD

2 stops14h 35mLufthansa

Deal found 7/27

$621

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 July 29, 2025.

Wed 10/155:50 pmIAD - OPO

2 stops23h 15mMultiple Airlines

Deal found 7/28

$249

Mon 9/2210:20 pmIAD - OPO

1 stop15h 40mTAP AIR PORTUGAL

Deal found 7/28

$255

Wed 9/38:20 amIAD - OPO

2 stops20h 00mUnited Airlines

Deal found 7/28

$359

Sun 8/35:10 pmIAD - OPO

2 stops35h 25mAir Canada

Deal found 7/27

$365

Sun 8/318:45 pmIAD - OPO

1 stop16h 30mSWISS

Deal found 7/27

$369

Mon 10/67:59 pmIAD - OPO

2 stops14h 31mAir France

Deal found 7/27

$389

Wed 10/112:08 pmIAD - OPO

2 stops17h 32mDelta

Deal found 7/28

$420

Fri 10/2410:45 pmIAD - OPO

2 stops16h 10mIberia

Deal found 7/27

$427

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

Wed 10/1

1:30 pm-3:50 pm

1 stop21h 20m

Porto

Wed 10/8

4:50 pm-11:45 am

1 stop23h 55m

$568

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 10/14

10:20 pm-11:20 pm

1 stop20h 00m

Porto

Tue 10/28

12:30 pm-4:50 pm

1 stop32h 20m

$569

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Mon 8/18

9:45 am-9:35 am

1 stop18h 50m

Porto

Tue 8/26

6:00 am-3:50 pm

1 stop14h 50m

$574

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 8/20

12:35 pm-9:20 am

2 stops15h 45m

Porto

Thu 9/4

12:10 pm-4:28 pm

2 stops33h 18m

$578

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 10/14

8:09 am-7:35 am

2 stops18h 26m

Porto

Thu 10/23

8:15 am-3:00 pm

1 stop11h 45m

$579

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 8/20

8:55 am-9:20 am

2 stops19h 25m

Porto

Fri 9/5

6:00 am-3:50 pm

1 stop14h 50m

$580

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Mon 9/15

5:45 pm-5:00 pm

1 stop18h 15m

Porto

Mon 9/22

10:35 pm-3:20 pm

1 stop21h 45m

$582

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 8/17

4:35 pm-11:40 am

1 stop14h 05m

Porto

Wed 9/3

8:15 am-3:00 pm

1 stop11h 45m

$589

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sat 10/25

1:00 pm-11:30 am

2 stops17h 30m

Porto

Tue 11/4

6:05 am-4:31 pm

2 stops15h 26m

$592

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 9/23

8:45 pm-7:05 pm

2 stops17h 20m

Porto

Tue 9/30

8:40 am-4:15 pm

1 stop12h 35m

$595

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 19 results

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 78 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 $1,033). 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.

What’s the top layover airport for flights from Washington, D.C. Dulles Intl Airport to Porto?

Frankfurt am Main (FRA) – chosen by Cheapflights users on 50% of 1-stop itineraries from Washington, D.C. Dulles Intl Airport to Porto on Cheapflights.

What’s the cheapest layover airport for flights from Washington, D.C. Dulles Intl Airport to Porto?

Frankfurt am Main (FRA) is the most affordable 1-stop option, with an average round-trip price of $689.

What’s the fastest layover option from Washington, D.C. Dulles Intl Airport to Porto?

Flights via Lisbon (LIS) have the shortest average one-way travel time for 1-stop routes: 3h 00m.

Which airport typically offers the quickest layover for flights from Washington, D.C. Dulles Intl Airport to Porto?

Flights via Lisbon (LIS) offer the fastest connection on this route, with an average layover time of 1h 50m.

Reviews of airlines servicing Porto

Get a feel of what it's like to fly with Delta, KLM, and Air France 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

8.0

Very good

7,977 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

7,977 reviews

Delta

8.0

Very good

7,977 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

1,383 reviews

Delta

8.0

Very good

7,977 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!

Air France

7.5

Good

1,465 reviews

Delta

8.0

Very good

7,977 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

1,683 reviews

Delta

8.0

Very good

7,977 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

8,899 reviews

Delta

8.0

Very good

7,977 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 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 $568, Turkish Airlines will fly you from Washington, D.C. Dulles Intl Airport to Porto and back. In addition to Turkish Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Lufthansa and Air Canada - these airlines can fly you to your destination from $569 and $578, respectively. These flights start at 22% 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?
$255 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 United Airlines and Air Canada, with prices starting from $359 and $365, 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, 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 $1,033). 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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Coimbra

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Alternative routes for Dulles Intl to Porto

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Reagan-National to Ponta Delgada flights

Dulles Intl to Faro flights

Reagan-National to Funchal flights

Baltimore to Ponta Delgada flights

Reagan-National to Faro flights

Baltimore to Faro flights

Baltimore to Funchal flights

Dulles Intl to Lajes flights

Dulles Intl to Porto Santo flights

Dulles Intl to Horta flights

Baltimore to Lajes flights

Dulles Intl to Pico Island flights

Other flights to Porto

Top 8 airlines flying from Dulles Intl to Porto

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$418	Average$815	FlexibilityNo cancel fee	On-timeN/A
KLM	Cheapest$424	Average$690	FlexibilityNo cancel fee	On-time75%
TAP AIR PORTUGAL	Cheapest$473	Average$765	FlexibilityNo cancel fee	On-timeN/A
Iberia	Cheapest$515	Average$761	FlexibilityNo cancel fee	On-time77%
SWISS	Cheapest$542	Average$651	FlexibilityNo cancel fee	On-time79%
United Airlines	Cheapest$543	Average$791	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$573	Average$698	FlexibilityNo cancel fee	On-time71%
Lufthansa	Cheapest$603	Average$691	FlexibilityNo cancel fee	On-time76%

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$249+ 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 10/15. 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 February or October, booked 78 days in advance, depart on a Sunday or Saturday and return on a Monday

Cheap flight deals from Dulles Intl to Porto

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find 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 July 29, 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 July 29, 2025.

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.

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?

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 July 25, 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 July 29, 2025.

What’s the top layover airport for flights from Washington, D.C. Dulles Intl Airport to Porto?

Share of 1-stop round-trip flights from Washington, D.C. Dulles Intl Airport to Porto chosen by Cheapflights users in the past 12 months, using the same layover each way.

What’s the cheapest layover airport for flights from Washington, D.C. Dulles Intl Airport to Porto?

Average round-trip fare for 1-stop flights from Washington, D.C. Dulles Intl Airport to Porto, chosen by Cheapflights users in the past 12 months, with the same layover each way.

What’s the fastest layover option from Washington, D.C. Dulles Intl Airport to Porto?

Shortest average travel time for 1-stop one-way flights from Washington, D.C. Dulles Intl Airport to Porto, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Which airport typically offers the quickest layover for flights from Washington, D.C. Dulles Intl Airport to Porto?

Average layover duration for 1-stop one-way flights from Washington, D.C. Dulles Intl Airport to Porto, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

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 July 29, 2025.

Get a feel of what it's like to fly with Delta, KLM, and Air France 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?

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?

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Alternative routes for Dulles Intl 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 July 29, 2025.