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Cheap flights from Washington, D.C. to Porto from $296

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 11/24. 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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Find the cheapest flights from Washington, D.C. to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
10:54 am - 10:30 amBWI-OPO
18h 36m2 stops
Delta Logo
6:35 am - 12:41 amOPO-BWI
23h 06m2 stops
$492Delta
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Wed, Jan 14 - Thu, Jan 22
Multiple Airlines Logo
9:45 am - 1:15 pmIAD-OPO
22h 30m2 stops
Multiple Airlines Logo
12:55 pm - 4:21 pmOPO-IAD
31h 26m2 stops
$493Multiple Airlines
Find Deal
Wed, Mar 4 - Wed, Mar 11
Delta Logo
6:05 pm - 3:25 pmIAD-OPO
16h 20m1 stop
Delta Logo
6:30 am - 7:12 pmOPO-IAD
40h 42m2 stops
$494Delta
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Sun, Mar 1 - Fri, Mar 13
United Airlines Logo
4:10 pm - 11:40 amDCA-OPO
38h 30m2 stops
United Airlines Logo
12:30 pm - 2:10 pmOPO-DCA
30h 40m2 stops
$499United Airlines
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Mon, Dec 1 - Fri, Dec 12
TAP AIR PORTUGAL Logo
10:30 pm - 5:00 pmIAD-OPO
13h 30m1 stop
TAP AIR PORTUGAL Logo
10:55 am - 9:00 pmOPO-IAD
15h 05m1 stop
$501TAP AIR PORTUGAL
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Fri, Dec 5 - Wed, Dec 10
United Airlines Logo
6:30 am - 11:40 amBWI-OPO
24h 10m2 stops
United Airlines Logo
6:00 am - 9:42 pmOPO-BWI
19h 42m2 stops
$504United Airlines
Find Deal
Sun, Feb 15 - Tue, Mar 24
TAP AIR PORTUGAL Logo
5:40 pm - 9:00 amIAD-OPO
10h 20m1 stop
TAP AIR PORTUGAL Logo
9:00 am - 3:05 pmOPO-IAD
11h 05m1 stop
$508TAP AIR PORTUGAL
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Sun, Apr 12 - Wed, May 6
American Airlines Logo
12:10 pm - 7:40 amDCA-OPO
14h 30m2 stops
American Airlines Logo
8:20 am - 6:54 pmOPO-DCA
15h 34m2 stops
$560American Airlines
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Thu, Jan 8 - Wed, Jan 21
Iberia Logo
1:35 pm - 11:45 amDCA-OPO
17h 10m2 stops
Iberia Logo
8:40 pm - 6:54 pmOPO-DCA
27h 14m2 stops
$570Iberia
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Thu, Jan 8 - Mon, Jan 12
Iberia Logo
6:59 pm - 11:45 amDCA-OPO
12h 46m2 stops
Iberia Logo
8:20 am - 8:10 pmOPO-DCA
15h 50m2 stops
$635Iberia
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Sun, Mar 15 - Mon, Mar 23

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

Our best Air Canada deals on Washington, D.C. to Porto flight tickets
Air Canada
Dec 1
DCA6:00 amWashington, D.C. Reagan-National
25h 50m
2 stops
OPO12:50 pmPorto
Dec 8
OPO6:00 amPorto
57h 21m
2 stops
DCA10:21 amWashington, D.C. Reagan-National
$495
Find similar
Air Canada
Dec 5
IAD9:45 amWashington, D.C. Dulles Intl
21h 20m
2 stops
OPO12:05 pmPorto
Dec 10
OPO6:00 amPorto
38h 46m
2 stops
IAD3:46 pmWashington, D.C. Dulles Intl
$534
Find similar
Air Canada
Feb 12
IAD9:45 amWashington, D.C. Dulles Intl
21h 20m
2 stops
OPO12:05 pmPorto
Feb 18
OPO6:00 amPorto
43h 54m
2 stops
IAD8:54 pmWashington, D.C. Dulles Intl
$597
Find similar

TAP AIR PORTUGAL flights from Washington, D.C. to Porto

Our best TAP AIR PORTUGAL deals on Washington, D.C. to Porto flight tickets
TAP AIR PORTUGAL
Feb 12
IAD5:30 pmWashington, D.C. Dulles Intl
11h 25m
1 stop
OPO9:55 amPorto
Feb 18
OPO10:00 amPorto
16h 00m
1 stop
IAD9:00 pmWashington, D.C. Dulles Intl
$498
Find similar
TAP AIR PORTUGAL
Dec 5
IAD10:30 pmWashington, D.C. Dulles Intl
14h 30m
1 stop
OPO6:00 pmPorto
Dec 10
OPO12:00 pmPorto
14h 00m
1 stop
IAD9:00 pmWashington, D.C. Dulles Intl
$501
Find similar
TAP AIR PORTUGAL
Jan 14
IAD10:30 pmWashington, D.C. Dulles Intl
9h 35m
1 stop
OPO1:05 pmPorto
Jan 19
OPO8:00 pmPorto
23h 35m
1 stop
IAD2:35 pmWashington, D.C. Dulles Intl
$516
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momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to Porto that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated November 17, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Wed 1/14

10:54 am-10:30 am

2 stops18h 36m

Porto

Thu 1/22

6:35 am-12:41 am

2 stops23h 06m

$492

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 3/4

9:45 am-1:15 pm

2 stops22h 30m

Porto

Wed 3/11

12:55 pm-4:21 pm

2 stops31h 26m

$493

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 3/1

6:05 pm-3:25 pm

1 stop16h 20m

Porto

Fri 3/13

6:30 am-7:12 pm

2 stops40h 42m

$494

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Mon 12/1

4:10 pm-11:40 am

2 stops38h 30m

Porto

Fri 12/12

12:30 pm-2:10 pm

2 stops30h 40m

$499

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Fri 12/5

10:30 pm-5:00 pm

1 stop13h 30m

Porto

Wed 12/10

10:55 am-9:00 pm

1 stop15h 05m

$501

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Sun 2/15

6:30 am-11:40 am

2 stops24h 10m

Porto

Tue 3/24

6:00 am-9:42 pm

2 stops19h 42m

$504

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 4/12

5:40 pm-9:00 am

1 stop10h 20m

Porto

Wed 5/6

9:00 am-3:05 pm

1 stop11h 05m

$508

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Thu 1/8

12:10 pm-7:40 am

2 stops14h 30m

Porto

Wed 1/21

8:20 am-6:54 pm

2 stops15h 34m

$560

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Thu 1/8

1:35 pm-11:45 am

2 stops17h 10m

Porto

Mon 1/12

8:40 pm-6:54 pm

2 stops27h 14m

$570

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Sun 3/15

6:59 pm-11:45 am

2 stops12h 46m

Porto

Mon 3/23

8:20 am-8:10 pm

2 stops15h 50m

$635

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Porto from

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

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 October is, on average, the cheapest month to fly to Porto from Washington, D.C., with most prices found around $594. If you aren’t able to travel during the month of October, then book flights to Porto from Washington, D.C. during February instead. Flights to Porto in February, while not as cheap as those in October, still average around $612.

What is the cheapest day to depart on your flight to Porto?

The cheapest day to depart on your flight to Porto is on a Sunday when prices can be found for as low as $613. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $779. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

What is the cheapest time of day to depart on your flight to Porto?

In the afternoon is the cheapest time of day to fly from Washington, D.C. to Porto when you can find flight prices for as low as $698. Flying to Porto in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $836 on average. Flights to Porto from Washington, D.C. at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 $738 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 $702 on momondo.

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

You could potentially save up to 38% 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?

As of November 2025, prices for Washington, D.C. to Porto flights are approximately 5% cheaper when compared to flights at the same time last year.

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

Direct flights

None
There are no direct flights from Washington, D.C. to Porto. There are no popular flight routes from Washington, D.C. to Porto.
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  • 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 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?

  • 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?

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
United AirlinesPriceFrom $493Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
TAP AIR PORTUGALPriceFrom $505Free CancellationRating
7.1
2,065 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $515Free CancellationRating
7.0
3,020 reviews
Search Iberia flights
DeltaPriceFrom $529Free CancellationRating
7.9
8,007 reviews
Search Delta flights
KLMPriceFrom $555Free CancellationRating
7.7
1,411 reviews
Search KLM flights
LufthansaPriceFrom $618Free CancellationRating
6.8
7,576 reviews
Search Lufthansa flights

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Coimbra
Aveiro
Matosinhos
Braga
Lamego
Guimarães
Esposende
Chaves
Espinho
Viseu
Ponte de Lima
Arcos de Valdevez
Pinhao
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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