What is the cheapest airline that flies from Washington, D.C. to Porto?

United Airlines, Lufthansa, and Delta are the most popular carriers operating from Washington, D.C. to Porto

How long does it take to fly to Porto?

Flight times from Washington, D.C. to Porto vary, but if you’re flying out of Baltimore and flying into Porto (one of the most popular routes), then the duration is 13h 35m on average. Another popular route from Washington, D.C. to Porto is flying from Washington, D.C. to Porto, which will take roughly 13h 45m. Keep in mind that layovers or delays could extend your travel time.

Which layover airport offers the lowest fares from Washington, D.C. to Porto?

Flights via Frankfurt am Main (FRA) offer the lowest average round-trip price of $617.

Which layover airport has the shortest connection time from Washington, D.C. to Porto?

Montreal (YUL) has the shortest average layover time for this route: 1h 53m.

Which airport is the most popular layover for flights between Washington, D.C. and Porto?

Lisbon (LIS) was the most common stop: 77% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest travel time from Washington, D.C. to Porto?

Flights connecting via Montreal (YUL) have the shortest average one-way travel time: 9h 40m.

What airlines fly to Porto?

TAP AIR PORTUGAL, United Airlines and Lufthansa are the top three most popular airlines that fly to Porto from Washington, D.C. according to our data. TAP AIR PORTUGAL is the first choice among our users, with 77% of people opting to fly with this airline when traveling to Porto. Keep in mind that there are 6 different airlines that fly to Porto on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Washington, D.C. to Porto Airport?

Prices for flights from Washington, D.C. to Porto Airport are refreshed on a daily basis.

How many operators does momondo search for flights from Washington, D.C. to Porto Airport?

There are 6 operators available for flights from Washington, D.C. to Porto Airport as of August 2026.

How old do you have to be to fly from Washington, D.C. to Porto Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. to Porto Airport.

What documentation or ID do you need to fly to Porto Airport?

The travel and health documents required for your trip to Porto Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Porto Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$272 Cheap Flights from Washington, D.C. to Porto in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Washington, D.C. to Porto

Round-trip

One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

10:35 pm - 6:55 pmIAD Washington, D.C. Dulles Intl-OPO Porto

15h 20m1 stop Lisbon Humberto Delgado

11:00 am - 8:35 pmOPO Porto-IAD Washington, D.C. Dulles Intl

14h 35m1 stop Lisbon Humberto Delgado

$657TAP AIR PORTUGAL

Thu, Oct 22 - Wed, Nov 4

10:35 pm - 3:00 pmIAD Washington, D.C. Dulles Intl-OPO Porto

11h 25m1 stop Lisbon Humberto Delgado

12:25 pm - 8:35 pmOPO Porto-IAD Washington, D.C. Dulles Intl

13h 10m1 stop Lisbon Humberto Delgado

$658TAP AIR PORTUGAL

Thu, Oct 22 - Wed, Nov 4

10:35 pm - 11:50 pmIAD Washington, D.C. Dulles Intl-OPO Porto

20h 15m2 stops Lisbon Humberto Delgado Madrid Barajas

2:00 pm - 3:10 pmOPO Porto-IAD Washington, D.C. Dulles Intl

30h 10m2 stops Madrid Barajas Lisbon Humberto Delgado

$667Multiple Airlines

Wed, Oct 14 - Tue, Oct 20

8:25 pm - 5:50 pmIAD Washington, D.C. Dulles Intl-OPO Porto

16h 25m1 stop Madrid Barajas

6:15 am - 6:50 pmOPO Porto-IAD Washington, D.C. Dulles Intl

17h 35m1 stop Madrid Barajas

$668Multiple Airlines

Tue, Oct 13 - Tue, Oct 20

8:37 am - 9:30 amIAD Washington, D.C. Dulles Intl-OPO Porto

19h 53m1 stop Newark

6:00 am - 2:35 pmOPO Porto-IAD Washington, D.C. Dulles Intl

13h 35m1 stop Frankfurt am Main

$696United Airlines

Mon, Nov 30 - Fri, Dec 11

5:20 pm - 9:30 amIAD Washington, D.C. Dulles Intl-OPO Porto

11h 10m1 stop Newark

6:00 am - 3:55 pmOPO Porto-IAD Washington, D.C. Dulles Intl

14h 55m1 stop Frankfurt am Main

$696United Airlines

Tue, Dec 8 - Wed, Dec 16

6:40 pm - 10:35 amIAD Washington, D.C. Dulles Intl-OPO Porto

10h 55m1 stop Paris Charles de Gaulle

11:15 am - 3:55 pmOPO Porto-IAD Washington, D.C. Dulles Intl

33h 40m1 stop Amsterdam Schiphol

$698Delta

Mon, Nov 30 - Thu, Dec 10

9:30 pm - 10:00 pmIAD Washington, D.C. Dulles Intl-OPO Porto

19h 30m1 stop Paris Charles de Gaulle

11:15 am - 3:55 pmOPO Porto-IAD Washington, D.C. Dulles Intl

33h 40m1 stop Amsterdam Schiphol

$698Delta

Wed, Dec 2 - Tue, Dec 8

6:00 pm - 3:20 pmIAD Washington, D.C. Dulles Intl-OPO Porto

16h 20m1 stop Frankfurt am Main

6:00 am - 3:55 pmOPO Porto-IAD Washington, D.C. Dulles Intl

14h 55m1 stop Frankfurt am Main

$745Lufthansa

Sun, Jan 24 - Sun, Jan 31

10:55 pm - 11:55 pmIAD Washington, D.C. Dulles Intl-OPO Porto

20h 00m1 stop Munich Franz Josef Strauss

6:15 am - 3:55 pmOPO Porto-IAD Washington, D.C. Dulles Intl

14h 40m2 stops Munich Franz Josef Strauss Frankfurt am Main

$750Lufthansa

Thu, Dec 3 - Fri, Dec 11

Cheap last minute flights

Enter your travel dates to find the best prices.

10:35 pm - 8:25 pmIAD Washington, D.C. Dulles Intl-OPO Porto

16h 50m1 stop Lisbon Humberto Delgado

10:30 pm - 2:25 pmOPO Porto-IAD Washington, D.C. Dulles Intl

20h 55m1 stop Lisbon Humberto Delgado

$777TAP AIR PORTUGAL

Mon, Aug 31 - Thu, Sep 10

10:35 pm - 12:40 amIAD Washington, D.C. Dulles Intl-OPO Porto

21h 05m1 stop Lisbon Humberto Delgado

10:30 pm - 3:10 pmOPO Porto-IAD Washington, D.C. Dulles Intl

21h 40m1 stop Lisbon Humberto Delgado

$811TAP AIR PORTUGAL

Mon, Aug 31 - Tue, Sep 8

10:35 pm - 3:00 pmIAD Washington, D.C. Dulles Intl-OPO Porto

11h 25m1 stop Lisbon Humberto Delgado

7:00 am - 2:25 pmOPO Porto-IAD Washington, D.C. Dulles Intl

36h 25m2 stops Madrid Barajas Lisbon Humberto Delgado

$1,013Multiple Airlines

Mon, Aug 31 - Thu, Sep 10

4:30 pm - 1:35 pmIAD Washington, D.C. Dulles Intl-OPO Porto

16h 05m2 stops Rome Fiumicino Madrid Barajas

7:00 am - 8:25 pmOPO Porto-IAD Washington, D.C. Dulles Intl

18h 25m3 stops Madrid Barajas Halifax Intl Toronto Pearson Intl

$1,042Multiple Airlines

Mon, Aug 31 - Thu, Sep 10

4:20 pm - 7:00 amDCA Washington, D.C. Reagan-National-OPO Porto

9h 40m1 stop Montreal Pierre Elliott Trudeau Intl

11:50 am - 9:46 amOPO Porto-DCA Washington, D.C. Reagan-National

26h 56m2 stops Montreal Pierre Elliott Trudeau Intl Newark

$1,068United Airlines

Mon, Aug 31 - Thu, Sep 10

3:45 pm - 7:00 amIAD Washington, D.C. Dulles Intl-OPO Porto

10h 15m1 stop Montreal Pierre Elliott Trudeau Intl

12:15 pm - 11:26 amOPO Porto-IAD Washington, D.C. Dulles Intl

28h 11m2 stops Montreal Pierre Elliott Trudeau Intl Newark

$1,068United Airlines

Mon, Aug 31 - Tue, Sep 8

7:15 pm - 3:30 pmIAD Washington, D.C. Dulles Intl-OPO Porto

15h 15m2 stops New York John F Kennedy Intl Amsterdam Schiphol

5:00 am - 3:35 pmOPO Porto-IAD Washington, D.C. Dulles Intl

15h 35m1 stop Amsterdam Schiphol

$1,082Delta

Tue, Sep 1 - Thu, Sep 10

5:36 pm - 3:25 pmBWI Baltimore/Washington-OPO Porto

16h 49m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle

5:00 am - 4:55 pmOPO Porto-BWI Baltimore/Washington

16h 55m2 stops Amsterdam Schiphol Detroit Metropolitan Wayne County

$1,086Delta

Mon, Aug 31 - Thu, Sep 10

9:40 pm - 10:00 pmIAD Washington, D.C. Dulles Intl-OPO Porto

19h 20m1 stop Paris Charles de Gaulle

5:00 am - 3:35 pmOPO Porto-IAD Washington, D.C. Dulles Intl

15h 35m1 stop Amsterdam Schiphol

$1,132KLM

Wed, Sep 2 - Mon, Sep 7

9:45 pm - 10:00 pmIAD Washington, D.C. Dulles Intl-OPO Porto

19h 15m1 stop Paris Charles de Gaulle

5:00 am - 3:35 pmOPO Porto-IAD Washington, D.C. Dulles Intl

15h 35m1 stop Amsterdam Schiphol

$1,259KLM

Thu, Sep 3 - Wed, Sep 9

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United Airlines flights from Washington, D.C. to Porto

Our best United Airlines deals on Washington, D.C. to Porto flight tickets

United Airlines

Nov 30

IAD8:37 amWashington, D.C. Dulles Intl

19h 53m

1 stop

OPO9:30 amPorto

Dec 11

OPO6:00 amPorto

13h 35m

1 stop

IAD2:35 pmWashington, D.C. Dulles Intl

$696

United Airlines

Dec 8

IAD8:15 amWashington, D.C. Dulles Intl

20h 15m

1 stop

OPO9:30 amPorto

Dec 16

OPO6:00 amPorto

13h 35m

1 stop

IAD2:35 pmWashington, D.C. Dulles Intl

$697

United Airlines

Nov 9

IAD5:50 pmWashington, D.C. Dulles Intl

10h 40m

1 stop

OPO9:30 amPorto

Nov 20

OPO12:35 pmPorto

14h 50m

1 stop

IAD10:25 pmWashington, D.C. Dulles Intl

$716

Delta flights from Washington, D.C. to Porto

Our best Delta deals on Washington, D.C. to Porto flight tickets

Delta

Nov 30

IAD6:40 pmWashington, D.C. Dulles Intl

10h 55m

1 stop

OPO10:35 amPorto

Dec 10

OPO11:15 amPorto

33h 40m

1 stop

IAD3:55 pmWashington, D.C. Dulles Intl

$698

Delta

Dec 2

IAD12:35 pmWashington, D.C. Dulles Intl

17h 00m

2 stops

OPO10:35 amPorto

Dec 14

OPO11:15 amPorto

33h 30m

1 stop

IAD3:45 pmWashington, D.C. Dulles Intl

$703

Delta

Nov 30

IAD6:40 pmWashington, D.C. Dulles Intl

10h 55m

1 stop

OPO10:35 amPorto

Dec 9

OPO5:55 amPorto

18h 25m

1 stop

IAD7:20 pmWashington, D.C. Dulles Intl

$705

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Thu 10/22

10:35 pm-6:55 pm

1 stop15h 20m

Porto

Wed 11/4

11:00 am-8:35 pm

1 stop14h 35m

$657

Quickest round-trip

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Thu 10/22

10:35 pm-3:00 pm

1 stop11h 25m

Porto

Wed 11/4

12:25 pm-8:35 pm

1 stop13h 10m

$658

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Wed 10/14

10:35 pm-11:50 pm

2 stops20h 15m

Porto

Tue 10/20

2:00 pm-3:10 pm

2 stops30h 10m

$667

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Tue 10/13

8:25 pm-5:50 pm

1 stop16h 25m

Porto

Tue 10/20

6:15 am-6:50 pm

1 stop17h 35m

$668

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Mon 11/30

8:37 am-9:30 am

1 stop19h 53m

Porto

Fri 12/11

6:00 am-2:35 pm

1 stop13h 35m

$696

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Tue 12/8

5:20 pm-9:30 am

1 stop11h 10m

Porto

Wed 12/16

6:00 am-3:55 pm

1 stop14h 55m

$696

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Mon 11/30

6:40 pm-10:35 am

1 stop10h 55m

Porto

Thu 12/10

11:15 am-3:55 pm

1 stop33h 40m

$698

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Wed 12/2

9:30 pm-10:00 pm

1 stop19h 30m

Porto

Tue 12/8

11:15 am-3:55 pm

1 stop33h 40m

$698

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Sun 1/24

6:00 pm-3:20 pm

1 stop16h 20m

Porto

Sun 1/31

6:00 am-3:55 pm

1 stop14h 55m

$745

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Thu 12/3

10:55 pm-11:55 pm

1 stop20h 00m

Porto

Fri 12/11

6:15 am-3:55 pm

2 stops14h 40m

$750

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Washington, D.C. to Porto

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Layovers

Other information

What is the typical price of a round-trip flight between Washington, D.C. and Porto?

Prices are currently low for flights on this route.

Typical prices usually range from $667 to $925.
The lowest price recently found on this route was $657.

What is the cheapest month to fly to Porto?

The month of January is, on average, the cheapest month to fly to Porto from Washington, D.C., with most prices found around $613. If you aren’t able to travel during the month of January, then book flights to Porto from Washington, D.C. during February instead. Flights to Porto in February, while not as cheap as those in January, still average around $659.

How far in advance should I book a flight from Washington, D.C. to Porto?

You are more likely to see cheaper flights to Porto from Washington, D.C. when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $832 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from Washington, D.C. for as low as $721 on momondo.

Can stopping save me money on Washington, D.C. to Porto flights?

You could potentially save up to 13% on your flight if you consider stops on a Washington, D.C. to Porto flight.

How have Washington, D.C. to Porto flight prices changed over time?

When to book flights from Washington, D.C. to Porto

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. to Porto according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Washington, D.C. to Porto (WAS to OPO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to Porto

Best Price Found	$272
Fastest flight time	12h 20m
Direct flights	None

The best one-way flight to Porto from Washington, D.C. in the past 72 hours is $272. The best round-trip flight deal from Washington, D.C. to Porto found on momondo in the last 72 hours is $657.

The fastest flight from Washington, D.C. to Porto takes 12h 20m

There are no direct flights from Washington, D.C. to Porto. There are no popular flight routes from Washington, D.C. to Porto.

Search flight deals

Frequently asked questions about flying from Washington, D.C. to Porto

How far is Washington, D.C. to Porto by plane?
The straight-line distance from Washington, D.C. to Porto is 3523.1 mi. By plane, this route typically takes 12h 20m.
When did momondo last update prices for flights from Washington, D.C. to Porto Airport?
Prices for flights from Washington, D.C. to Porto Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Washington, D.C. to Porto Airport?
There are 6 operators available for flights from Washington, D.C. to Porto Airport as of August 2026.
How old do you have to be to fly from Washington, D.C. to Porto Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. to Porto Airport.
What documentation or ID do you need to fly to Porto Airport?
The travel and health documents required for your trip to Porto Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Porto Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Washington, D.C. to Porto?
momondo data reveals that the most frequently booked airline on the route from Washington, D.C. to Porto is TAP AIR PORTUGAL, representing 61% of all bookings. The subsequent popular airlines are United Airlines at 19%, Lufthansa at 6%, and KLM at 3%.

Best airlines flying from Washington, D.C. to Porto

Compare and see reviews for airlines that fly from Washington, D.C. to Porto with momondo

Airline	Rating	Free Cancellation	Price
KLM	PriceFrom $477	Free Cancellation	Rating 7.8 1,568 reviews	Search KLM flights
United Airlines	PriceFrom $480	Free Cancellation	Rating 7.4 10,148 reviews	Search United Airlines flights
TAP AIR PORTUGAL	PriceFrom $498	Free Cancellation	Rating 7.2 2,376 reviews	Search TAP AIR PORTUGAL flights
Lufthansa	PriceFrom $514	Free Cancellation	Rating 6.8 8,227 reviews	Search Lufthansa flights
Delta	PriceFrom $533	Free Cancellation	Rating 7.8 8,538 reviews	Search Delta flights
Air France	PriceFrom $642	Free Cancellation	Rating 7.5 1,644 reviews	Search Air France flights

Vila Nova de Gaia

Coimbra

Aveiro

Braga

Pinhao

Matosinhos

Esposende

Chaves

Arcos de Valdevez

Viseu

Espinho

Guimarães

Lamego

Ponte de Lima

Mesao Frio

Penafiel

Caminha

Baiao

Mira

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Porto?

It is quick and easy to find Washington, D.C. to Porto flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Porto that suits you.

Can I find flights from Washington, D.C. to Porto with flexible booking policies on momondo?

Flights from Washington, D.C. to Porto with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Washington, D.C. to Porto?

momondo provides multiple filters to help you find the best flight to Porto from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Washington, D.C. to Porto right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Washington, D.C. to Porto now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Porto and let you know when they change.

An easier way to manage your Porto trip

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Cheap flights from Washington, D.C. to Porto from $272

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to Porto departing on 10/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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United Airlines flights from Washington, D.C. to Porto

Our best United Airlines deals on Washington, D.C. to Porto flight tickets

Delta flights from Washington, D.C. to Porto

Our best Delta deals on Washington, D.C. to Porto flight tickets

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How to get the cheapest flight ticket from Washington, D.C. to Porto

What is the typical price of a round-trip flight between Washington, D.C. and Porto?

What is the cheapest month to fly to Porto?

How far in advance should I book a flight from Washington, D.C. to Porto?

Can stopping save me money on Washington, D.C. to Porto flights?

How have Washington, D.C. to Porto flight prices changed over time?

What is the cheapest airline that flies from Washington, D.C. to Porto?

What airlines fly to Porto?

Which airport is the most popular layover for flights between Washington, D.C. and Porto?

Which layover airport offers the lowest fares from Washington, D.C. to Porto?

Which layover airport has the shortest travel time from Washington, D.C. to Porto?

Which layover airport has the shortest connection time from Washington, D.C. to Porto?

How long does it take to fly to Porto?

When to book flights from Washington, D.C. to Porto

Cheap Washington, D.C. to Porto (WAS to OPO) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Washington, D.C. to Porto

Best airlines flying from Washington, D.C. to Porto

Compare and see reviews for airlines that fly from Washington, D.C. to Porto with momondo

Traveling to a place near Porto?

Why use momondo?

An easier way to manage your Porto trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

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List of cabin classes available on flights landing in Porto. Availability may vary depending on flight origin and airline.

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