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

Flights via Paris (CDG) offer the lowest average round-trip price of $657.

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

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

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

Lisbon (LIS) was the most common stop: 65% 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.

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 10h 27m on average. Another popular route from Washington, D.C. to Porto is flying from Baltimore to Porto, which will take roughly 13h 45m. 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 July 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.

$255 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 $827 to $1,093. The lowest price recently found on this route was $578.

Discover deals from 900+ travel sites with momondo.

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.

8:30 pm - 8:25 pm

BWI

OPO

18h 55m

2 stops

6:30 am - 10:15 pm

OPO

BWI

20h 45m

2 stops

$578Multiple Airlines

Sat, Sep 26 - Tue, Oct 6

8:30 pm - 8:25 pm

BWI

OPO

18h 55m

2 stops

6:30 am - 10:15 pm

OPO

BWI

20h 45m

2 stops

$583Multiple Airlines

Sat, Sep 26 - Tue, Oct 6

8:30 pm - 8:00 am

BWI

OPO

30h 30m

3 stops

6:30 am - 10:15 pm

OPO

BWI

20h 45m

2 stops

$602Multiple Airlines

Sat, Sep 26 - Tue, Oct 6

8:30 pm - 11:20 pm

BWI

OPO

21h 50m

2 stops

6:15 am - 10:15 pm

OPO

BWI

21h 00m

2 stops

$609Multiple Airlines

Mon, Sep 21 - Tue, Oct 6

6:25 pm - 3:30 pm

IAD

OPO

16h 05m

2 stops

5:00 am - 4:45 pm

OPO

IAD

15h 45m

1 stop

$797Delta

Sun, Oct 11 - Thu, Oct 29

2:56 pm - 7:40 am

DCA

OPO

35h 44m

2 stops

8:40 pm - 5:51 pm

OPO

DCA

25h 11m

2 stops

$798Iberia

Sat, Oct 17 - Sat, Oct 31

10:00 am - 9:30 am

DCA

OPO

19h 30m

1 stop

12:35 pm - 8:38 pm

OPO

DCA

13h 03m

1 stop

$799Brussels Airlines

Wed, Oct 28 - Wed, Nov 4

9:00 am - 9:30 am

DCA

OPO

19h 30m

1 stop

12:35 pm - 10:31 pm

OPO

DCA

14h 56m

1 stop

$800United Airlines

Wed, Nov 4 - Mon, Nov 9

6:00 am - 7:00 am

DCA

OPO

20h 00m

1 stop

6:00 am - 9:59 pm

OPO

DCA

20h 59m

2 stops

$801United Airlines

Mon, Oct 12 - Fri, Oct 23

5:05 pm - 10:25 am

DCA

OPO

12h 20m

1 stop

5:00 am - 7:59 pm

OPO

DCA

18h 59m

2 stops

$802Delta

Sun, Oct 11 - Thu, Oct 29

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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 16

BWI6:10 amBaltimore/Washington

22h 20m

2 stops

OPO9:30 amPorto

Nov 19

OPO12:35 pmPorto

26h 59m

2 stops

BWI10:34 amBaltimore/Washington

$754

United Airlines

Nov 16

BWI10:10 amBaltimore/Washington

18h 20m

2 stops

OPO9:30 amPorto

Nov 19

OPO12:35 pmPorto

26h 59m

2 stops

BWI10:34 amBaltimore/Washington

$755

United Airlines

Nov 4

DCA9:00 amWashington, D.C. Reagan-National

19h 30m

1 stop

OPO9:30 amPorto

Nov 9

OPO12:35 pmPorto

14h 56m

1 stop

DCA10:31 pmWashington, D.C. Reagan-National

$800

KLM flights from Washington, D.C. to Porto

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

KLM

Oct 18

DCA5:05 pmWashington, D.C. Reagan-National

12h 20m

1 stop

OPO10:25 amPorto

Oct 31

OPO11:30 amPorto

15h 39m

2 stops

DCA11:09 pmWashington, D.C. Reagan-National

$840

KLM

Oct 31

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

13h 30m

2 stops

OPO10:30 amPorto

Nov 7

OPO11:00 amPorto

17h 04m

1 stop

DCA11:04 pmWashington, D.C. Reagan-National

$858

KLM

Sep 28

DCA3:05 pmWashington, D.C. Reagan-National

14h 35m

2 stops

OPO10:40 amPorto

Oct 9

OPO11:25 amPorto

15h 35m

2 stops

DCA10:00 pmWashington, D.C. Reagan-National

$871

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Sat 9/26

8:30 pm-8:25 pm

2 stops18h 55m

Porto

Tue 10/6

6:30 am-10:15 pm

2 stops20h 45m

$578

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Sat 9/26

8:30 pm-8:25 pm

2 stops18h 55m

Porto

Tue 10/6

6:30 am-10:15 pm

2 stops20h 45m

$583

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Sat 9/26

8:30 pm-8:00 am

3 stops30h 30m

Porto

Tue 10/6

6:30 am-10:15 pm

2 stops20h 45m

$602

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Mon 9/21

8:30 pm-11:20 pm

2 stops21h 50m

Porto

Tue 10/6

6:15 am-10:15 pm

2 stops21h 00m

$609

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 10/11

6:25 pm-3:30 pm

2 stops16h 05m

Porto

Thu 10/29

5:00 am-4:45 pm

1 stop15h 45m

$797

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Sat 10/17

2:56 pm-7:40 am

2 stops35h 44m

Porto

Sat 10/31

8:40 pm-5:51 pm

2 stops25h 11m

$798

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Wed 10/28

10:00 am-9:30 am

1 stop19h 30m

Porto

Wed 11/4

12:35 pm-8:38 pm

1 stop13h 03m

$799

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Wed 11/4

9:00 am-9:30 am

1 stop19h 30m

Porto

Mon 11/9

12:35 pm-10:31 pm

1 stop14h 56m

$800

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Mon 10/12

6:00 am-7:00 am

1 stop20h 00m

Porto

Fri 10/23

6:00 am-9:59 pm

2 stops20h 59m

$801

Quickest round-trip

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Sun 10/11

5:05 pm-10:25 am

1 stop12h 20m

Porto

Thu 10/29

5:00 am-7:59 pm

2 stops18h 59m

$802

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 October instead. Flights to Porto in October, while not as cheap as those in December, still average around $364.

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 $818 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 $703 on momondo.

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

You could potentially save up to 20% 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 30m
Direct flights	None

The fastest flight from Washington, D.C. to Porto takes 9h 30m

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 30m.
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 July 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 56% of all bookings. The subsequent popular airlines are United Airlines at 22%, Lufthansa at 6%, and KLM at 4%.

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 1,538 reviews	Search KLM flights
United Airlines	PriceFrom $480	Free Cancellation	Rating 7.4 9,983 reviews	Search United Airlines flights
TAP AIR PORTUGAL	PriceFrom $501	Free Cancellation	Rating 7.2 2,336 reviews	Search TAP AIR PORTUGAL flights
Lufthansa	PriceFrom $514	Free Cancellation	Rating 6.8 8,131 reviews	Search Lufthansa flights
Delta	PriceFrom $533	Free Cancellation	Rating 7.8 8,470 reviews	Search Delta flights
Iberia	PriceFrom $593	Free Cancellation	Rating 7.0 3,255 reviews	Search Iberia flights

Vila Nova de Gaia

Coimbra

Braga

Aveiro

Matosinhos

Esposende

Lamego

Chaves

Pinhao

Arcos de Valdevez

Guimarães

Espinho

Ponte de Lima

Viseu

Curia

Mesao Frio

Penafiel

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 $255

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 8/27. 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

KLM flights from Washington, D.C. to Porto

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

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See travel insights to Porto from

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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