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

KLM, United Airlines, and British Airways are the most popular carriers operating from Washington, D.C. to Porto

What airlines fly to Porto?

TAP AIR PORTUGAL, United Airlines and Delta 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 74% 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.

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 $683.

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

Madrid (MAD) has the shortest average layover time for this route: 1h 05m.

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.

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

Lisbon (LIS) was the most common stop: 61% of momondo users choosing 1-stop flights on this route connected there.

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 Washington, D.C. and flying into Porto (one of the most popular routes), then the duration is 10h 30m on average. Another popular route from Washington, D.C. to Porto is flying from Baltimore to Porto, which will take roughly 13h 55m. Keep in mind that layovers or delays could extend your travel time.

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 May 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.

$305 Cheap Flights from Washington, D.C. to Porto in 2026

Q: 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 $1,111 to $839. The lowest price recently found on this route was $748.

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

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

1:00 pm - 10:30 am

BWI

OPO

16h 30m

2 stops

11:15 am - 11:46 pm

OPO

BWI

17h 31m

2 stops

$748Delta

Sun, Nov 15 - Wed, Nov 25

1:00 pm - 10:30 am

BWI

OPO

16h 30m

2 stops

11:25 am - 10:55 pm

OPO

BWI

16h 30m

2 stops

$755Delta

Tue, Nov 3 - Tue, Nov 10

9:00 am - 10:30 am

BWI

OPO

20h 30m

2 stops

5:00 am - 10:55 pm

OPO

BWI

22h 55m

2 stops

$777Delta

Mon, Nov 23 - Tue, Dec 1

8:35 pm - 5:45 pm

BWI

OPO

16h 10m

1 stop

6:35 pm - 6:45 pm

OPO

BWI

29h 10m

1 stop

$791British Airways

Tue, Nov 24 - Wed, Dec 2

10:45 am - 9:30 am

BWI

OPO

17h 45m

2 stops

12:35 pm - 12:38 am

OPO

BWI

17h 03m

2 stops

$805United Airlines

Mon, Nov 2 - Mon, Nov 9

7:10 pm - 9:45 am

BWI

OPO

57h 35m

2 stops

11:20 am - 8:57 pm

OPO

BWI

38h 37m

2 stops

$806United Airlines

Fri, Oct 2 - Wed, Oct 14

10:35 pm - 8:25 pm

IAD

OPO

16h 50m

1 stop

9:00 am - 3:10 pm

OPO

IAD

11h 10m

1 stop

$879TAP AIR PORTUGAL

Thu, Aug 27 - Sun, Sep 20

6:00 am - 7:00 am

DCA

OPO

20h 00m

1 stop

6:00 am - 9:50 pm

OPO

DCA

20h 50m

2 stops

$882Air Canada

Mon, Aug 31 - Wed, Sep 16

10:10 pm - 7:00 am

IAD

OPO

27h 50m

2 stops

6:00 am - 9:24 pm

OPO

IAD

20h 24m

2 stops

$886Air Canada

Sun, Aug 30 - Fri, Sep 11

10:35 pm - 3:00 pm

IAD

OPO

11h 25m

1 stop

9:00 am - 3:10 pm

OPO

IAD

11h 10m

1 stop

$888TAP AIR PORTUGAL

Thu, Oct 1 - Sun, Oct 4

Delta flights from Washington, D.C. to Porto

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

Delta

Nov 15

BWI1:00 pmBaltimore/Washington

16h 30m

2 stops

OPO10:30 amPorto

Nov 25

OPO11:15 amPorto

17h 31m

2 stops

BWI11:46 pmBaltimore/Washington

$748

Delta

Nov 3

BWI1:00 pmBaltimore/Washington

16h 30m

2 stops

OPO10:30 amPorto

Nov 10

OPO11:25 amPorto

16h 30m

2 stops

BWI10:55 pmBaltimore/Washington

$755

Delta

Nov 23

BWI9:00 amBaltimore/Washington

20h 30m

2 stops

OPO10:30 amPorto

Dec 1

OPO5:00 amPorto

22h 55m

2 stops

BWI10:55 pmBaltimore/Washington

$777

Air Canada flights from Washington, D.C. to Porto

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

Air Canada

Aug 31

DCA6:00 amWashington, D.C. Reagan-National

20h 00m

1 stop

OPO7:00 amPorto

Sep 16

OPO6:00 amPorto

20h 50m

2 stops

DCA9:50 pmWashington, D.C. Reagan-National

$882

Air Canada

Aug 30

IAD10:10 pmWashington, D.C. Dulles Intl

27h 50m

2 stops

OPO7:00 amPorto

Sep 11

OPO6:00 amPorto

20h 24m

2 stops

IAD9:24 pmWashington, D.C. Dulles Intl

$886

Air Canada

Aug 31

IAD8:15 amWashington, D.C. Dulles Intl

17h 45m

2 stops

OPO7:00 amPorto

Sep 8

OPO12:15 pmPorto

24h 28m

2 stops

IAD7:43 amWashington, D.C. Dulles Intl

$890

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Sun 11/15

1:00 pm-10:30 am

2 stops16h 30m

Porto

Wed 11/25

11:15 am-11:46 pm

2 stops17h 31m

$748

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Tue 11/3

1:00 pm-10:30 am

2 stops16h 30m

Porto

Tue 11/10

11:25 am-10:55 pm

2 stops16h 30m

$755

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Mon 11/23

9:00 am-10:30 am

2 stops20h 30m

Porto

Tue 12/1

5:00 am-10:55 pm

2 stops22h 55m

$777

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Tue 11/24

8:35 pm-5:45 pm

1 stop16h 10m

Porto

Wed 12/2

6:35 pm-6:45 pm

1 stop29h 10m

$791

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Mon 11/2

10:45 am-9:30 am

2 stops17h 45m

Porto

Mon 11/9

12:35 pm-12:38 am

2 stops17h 03m

$805

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Fri 10/2

7:10 pm-9:45 am

2 stops57h 35m

Porto

Wed 10/14

11:20 am-8:57 pm

2 stops38h 37m

$806

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Thu 8/27

10:35 pm-8:25 pm

1 stop16h 50m

Porto

Sun 9/20

9:00 am-3:10 pm

1 stop11h 10m

$879

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Mon 8/31

6:00 am-7:00 am

1 stop20h 00m

Porto

Wed 9/16

6:00 am-9:50 pm

2 stops20h 50m

$882

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 8/30

10:10 pm-7:00 am

2 stops27h 50m

Porto

Fri 9/11

6:00 am-9:24 pm

2 stops20h 24m

$886

Quickest round-trip

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Thu 10/1

10:35 pm-3:00 pm

1 stop11h 25m

Porto

Sun 10/4

9:00 am-3:10 pm

1 stop11h 10m

$888

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?

What is the cheapest month to fly to Porto?

The month of December is, on average, the cheapest month to fly to Porto from Washington, D.C., with most prices found around $274. If you aren’t able to travel during the month of December, then book flights to Porto from Washington, D.C. during April instead. Flights to Porto in April, while not as cheap as those in December, still average around $318.

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 $784 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 $629 on momondo.

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

You could potentially save up to 11% 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

Fastest flight time	9h 55m
Direct flights	None

The fastest flight from Washington, D.C. to Porto takes 9h 55m

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 9h 55m.
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 May 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 51% of all bookings. The subsequent popular airlines are United Airlines at 25%, Lufthansa at 6%, and Delta at 5%.

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 1,525 reviews	Search KLM flights
United Airlines	PriceFrom $493	Free Cancellation	Rating 7.4 9,750 reviews	Search United Airlines flights
TAP AIR PORTUGAL	PriceFrom $498	Free Cancellation	Rating 7.2 2,262 reviews	Search TAP AIR PORTUGAL flights
Lufthansa	PriceFrom $514	Free Cancellation	Rating 6.8 8,032 reviews	Search Lufthansa flights
Iberia	PriceFrom $515	Free Cancellation	Rating 7.0 3,222 reviews	Search Iberia flights
Delta	PriceFrom $529	Free Cancellation	Rating 7.9 8,425 reviews	Search Delta flights

Vila Nova de Gaia

Coimbra

Aveiro

Braga

Matosinhos

Lamego

Chaves

Esposende

Pinhao

Guimarães

Espinho

Arcos de Valdevez

Viseu

Ponte de Lima

Curia

Mesao Frio

Mira

Baiao

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.

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Cheap flights from Washington, D.C. to Porto from $329

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 10/21. 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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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

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

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

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