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

KLM, United Airlines, and TAP AIR PORTUGAL are the most popular carriers operating from Washington, D.C. to Porto

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 $487.

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

Lisbon (LIS) was the most common stop: 59% of momondo users choosing 1-stop flights on this route connected there.

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.

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 11h 02m 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.

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 67% 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 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.

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 April 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.

$354 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 $956 to $553. The lowest price recently found on this route was $625.

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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.

1:20 pm - 3:50 pm

IAD

OPO

21h 30m

1 stop

4:40 pm - 11:35 am

OPO

IAD

23h 55m

1 stop

$625Turkish Airlines

Mon, Sep 21 - Wed, Oct 14

1:20 pm - 3:40 pm

IAD

OPO

21h 20m

1 stop

11:00 am - 11:35 am

OPO

IAD

29h 35m

1 stop

$632Turkish Airlines

Wed, Sep 23 - Thu, Oct 1

9:45 pm - 3:40 pm

IAD

OPO

36h 55m

1 stop

4:50 pm - 11:35 am

OPO

IAD

23h 45m

1 stop

$634Turkish Airlines

Tue, Sep 8 - Tue, Sep 15

6:00 am - 7:00 am

DCA

OPO

20h 00m

1 stop

12:15 pm - 12:42 pm

OPO

DCA

29h 27m

2 stops

$789United Airlines

Tue, Sep 22 - Tue, Oct 13

5:55 pm - 9:45 am

DCA

OPO

10h 50m

1 stop

12:15 pm - 3:23 pm

OPO

DCA

32h 08m

2 stops

$791United Airlines

Sun, Sep 20 - Tue, Oct 13

6:00 pm - 11:45 am

DCA

OPO

12h 45m

2 stops

12:25 pm - 11:02 pm

OPO

DCA

15h 37m

2 stops

$802Iberia

Mon, Sep 21 - Tue, Sep 29

5:00 pm - 10:30 am

DCA

OPO

12h 30m

1 stop

5:00 am - 4:29 pm

OPO

DCA

16h 29m

2 stops

$803Delta

Mon, Sep 21 - Tue, Sep 29

11:00 am - 10:30 am

DCA

OPO

18h 30m

1 stop

5:00 am - 6:05 pm

OPO

DCA

18h 05m

2 stops

$804Delta

Mon, Sep 21 - Thu, Oct 15

9:30 pm - 7:05 pm

BWI

OPO

16h 35m

1 stop

4:40 pm - 7:40 pm

OPO

BWI

32h 00m

2 stops

$830Multiple Airlines

Wed, Oct 7 - Tue, Oct 20

8:30 pm - 11:00 pm

BWI

OPO

21h 30m

3 stops

5:05 am - 7:25 pm

OPO

BWI

19h 20m

3 stops

$855Multiple Airlines

Sun, Apr 26 - Sat, May 2

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

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

United Airlines

Sep 22

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

20h 00m

1 stop

OPO7:00 amPorto

Oct 13

OPO12:15 pmPorto

29h 27m

2 stops

DCA12:42 pmWashington, D.C. Reagan-National

$789

United Airlines

Sep 20

DCA5:55 pmWashington, D.C. Reagan-National

10h 50m

1 stop

OPO9:45 amPorto

Oct 13

OPO12:15 pmPorto

32h 08m

2 stops

DCA3:23 pmWashington, D.C. Reagan-National

$791

United Airlines

Sep 22

DCA11:00 amWashington, D.C. Reagan-National

15h 00m

2 stops

OPO7:00 amPorto

Oct 13

OPO12:15 pmPorto

28h 30m

2 stops

DCA11:45 amWashington, D.C. Reagan-National

$794

Delta flights from Washington, D.C. to Porto

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

Delta

Oct 7

IAD7:59 pmWashington, D.C. Dulles Intl

14h 26m

2 stops

OPO3:25 pmPorto

Nov 6

OPO5:00 amPorto

15h 45m

1 stop

IAD3:45 pmWashington, D.C. Dulles Intl

$768

Delta

Sep 21

DCA5:00 pmWashington, D.C. Reagan-National

12h 30m

1 stop

OPO10:30 amPorto

Sep 29

OPO5:00 amPorto

16h 29m

2 stops

DCA4:29 pmWashington, D.C. Reagan-National

$803

Delta

Sep 21

DCA11:00 amWashington, D.C. Reagan-National

18h 30m

1 stop

OPO10:30 amPorto

Oct 15

OPO5:00 amPorto

18h 05m

2 stops

DCA6:05 pmWashington, D.C. Reagan-National

$804

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Mon 9/21

1:20 pm-3:50 pm

1 stop21h 30m

Porto

Wed 10/14

4:40 pm-11:35 am

1 stop23h 55m

$625

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 9/23

1:20 pm-3:40 pm

1 stop21h 20m

Porto

Thu 10/1

11:00 am-11:35 am

1 stop29h 35m

$632

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 9/8

9:45 pm-3:40 pm

1 stop36h 55m

Porto

Tue 9/15

4:50 pm-11:35 am

1 stop23h 45m

$634

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Tue 9/22

6:00 am-7:00 am

1 stop20h 00m

Porto

Tue 10/13

12:15 pm-12:42 pm

2 stops29h 27m

$789

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Sun 9/20

5:55 pm-9:45 am

1 stop10h 50m

Porto

Tue 10/13

12:15 pm-3:23 pm

2 stops32h 08m

$791

Quickest round-trip

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Mon 9/21

6:00 pm-11:45 am

2 stops12h 45m

Porto

Tue 9/29

12:25 pm-11:02 pm

2 stops15h 37m

$802

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Mon 9/21

5:00 pm-10:30 am

1 stop12h 30m

Porto

Tue 9/29

5:00 am-4:29 pm

2 stops16h 29m

$803

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Mon 9/21

11:00 am-10:30 am

1 stop18h 30m

Porto

Thu 10/15

5:00 am-6:05 pm

2 stops18h 05m

$804

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Wed 10/7

9:30 pm-7:05 pm

1 stop16h 35m

Porto

Tue 10/20

4:40 pm-7:40 pm

2 stops32h 00m

$830

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Sun 4/26

8:30 pm-11:00 pm

3 stops21h 30m

Porto

Sat 5/2

5:05 am-7:25 pm

3 stops19h 20m

$855

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 January is, on average, the cheapest month to fly to Porto from Washington, D.C., with most prices found around $552. If you aren’t able to travel during the month of January, then book flights to Porto from Washington, D.C. during October instead. Flights to Porto in October, while not as cheap as those in January, still average around $594.

How far in advance should I book a flight 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 $742 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 10% 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 25m
Direct flights	None

The fastest flight from Washington, D.C. to Porto takes 9h 25m

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 25m.
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 April 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 49% of all bookings. The subsequent popular airlines are United Airlines at 25%, Delta at 7%, and Lufthansa at 6%.

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 1,499 reviews	Search KLM flights
TAP AIR PORTUGAL	PriceFrom $493	Free Cancellation	Rating 7.1 2,205 reviews	Search TAP AIR PORTUGAL flights
United Airlines	PriceFrom $494	Free Cancellation	Rating 7.4 9,587 reviews	Search United Airlines flights
Lufthansa	PriceFrom $514	Free Cancellation	Rating 6.8 7,927 reviews	Search Lufthansa flights
Iberia	PriceFrom $515	Free Cancellation	Rating 7.0 3,180 reviews	Search Iberia flights
Delta	PriceFrom $529	Free Cancellation	Rating 7.9 8,403 reviews	Search Delta flights

Vila Nova de Gaia

Coimbra

Braga

Aveiro

Matosinhos

Lamego

Esposende

Chaves

Pinhao

Guimarães

Espinho

Arcos de Valdevez

Ponte de Lima

Viseu

Curia

Penafiel

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 $354

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 4/25. 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

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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 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

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Why use momondo?

An easier way to manage your Porto trip

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