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Cheap flights from Washington, D.C. Dulles Intl Airport to Porto from $286

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. Dulles Intl Airport to Porto departing on 12/1. 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. Dulles Intl Airport to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
5:25 pm - 11:15 amIAD-OPO
12h 50m1 stop
Multiple Airlines Logo
12:30 pm - 11:21 pmOPO-IAD
15h 51m2 stops
$488Multiple Airlines
Find Deal
Wed, Nov 19 - Tue, Dec 16
Delta Logo
12:36 pm - 10:30 amIAD-OPO
16h 54m2 stops
Delta Logo
11:15 am - 12:16 amOPO-IAD
18h 01m2 stops
$492Delta
Find Deal
Tue, Nov 11 - Tue, Nov 18
TAP AIR PORTUGAL Logo
5:30 pm - 9:55 amIAD-OPO
11h 25m1 stop
TAP AIR PORTUGAL Logo
10:55 am - 9:00 pmOPO-IAD
15h 05m1 stop
$497TAP AIR PORTUGAL
Find Deal
Thu, Feb 12 - Wed, Feb 18
United Airlines Logo
12:50 pm - 11:40 amIAD-OPO
17h 50m2 stops
United Airlines Logo
6:00 am - 8:26 pmOPO-IAD
43h 26m2 stops
$499United Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 10
United Airlines Logo
12:50 pm - 11:40 amIAD-OPO
17h 50m2 stops
United Airlines Logo
6:00 am - 9:14 pmOPO-IAD
20h 14m2 stops
$503United Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 17
Lufthansa Logo
6:00 pm - 11:40 amIAD-OPO
12h 40m1 stop
Lufthansa Logo
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
$513Lufthansa
Find Deal
Thu, Jan 15 - Sun, Jan 18
Lufthansa Logo
6:00 pm - 2:45 pmIAD-OPO
15h 45m1 stop
Lufthansa Logo
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
$516Lufthansa
Find Deal
Fri, Feb 20 - Sat, Feb 28
TAP AIR PORTUGAL Logo
10:30 pm - 5:00 pmIAD-OPO
13h 30m1 stop
TAP AIR PORTUGAL Logo
8:00 pm - 2:35 pmOPO-IAD
23h 35m1 stop
$519TAP AIR PORTUGAL
Find Deal
Fri, Dec 5 - Mon, Dec 8
KLM Logo
6:50 pm - 10:30 amIAD-OPO
10h 40m1 stop
KLM Logo
11:25 am - 7:15 pmOPO-IAD
12h 50m1 stop
$533KLM
Find Deal
Wed, Nov 12 - Sun, Nov 16
KLM Logo
7:59 pm - 3:25 pmIAD-OPO
15h 26m2 stops
KLM Logo
4:10 pm - 5:05 pmOPO-IAD
28h 55m1 stop
$537KLM
Find Deal
Sun, Mar 8 - Sat, Mar 14

Delta flights from Washington, D.C. Dulles Intl Airport to Porto

Our best Delta deals on Washington, D.C. Dulles Intl Airport to Porto flight tickets
Delta
Nov 11
IAD12:36 pmWashington, D.C. Dulles Intl
16h 54m
2 stops
OPO10:30 amPorto
Nov 18
OPO11:15 amPorto
18h 01m
2 stops
IAD12:16 amWashington, D.C. Dulles Intl
$492
Find similar
Delta
Nov 19
IAD12:11 pmWashington, D.C. Dulles Intl
17h 19m
2 stops
OPO10:30 amPorto
Dec 16
OPO11:15 amPorto
17h 57m
2 stops
IAD12:12 amWashington, D.C. Dulles Intl
$498
Find similar
Delta
Feb 12
IAD6:05 pmWashington, D.C. Dulles Intl
16h 20m
1 stop
OPO3:25 pmPorto
Feb 18
OPO6:00 amPorto
18h 12m
2 stops
IAD7:12 pmWashington, D.C. Dulles Intl
$518
Find similar

United Airlines flights from Washington, D.C. Dulles Intl Airport to Porto

Our best United Airlines deals on Washington, D.C. Dulles Intl Airport to Porto flight tickets
United Airlines
Dec 3
IAD12:50 pmWashington, D.C. Dulles Intl
17h 50m
2 stops
OPO11:40 amPorto
Dec 10
OPO6:00 amPorto
43h 26m
2 stops
IAD8:26 pmWashington, D.C. Dulles Intl
$499
Find similar
United Airlines
Dec 3
IAD12:50 pmWashington, D.C. Dulles Intl
17h 50m
2 stops
OPO11:40 amPorto
Dec 17
OPO6:00 amPorto
20h 14m
2 stops
IAD9:14 pmWashington, D.C. Dulles Intl
$503
Find similar
United Airlines
Dec 29
IAD10:33 pmWashington, D.C. Dulles Intl
32h 07m
2 stops
OPO11:40 amPorto
Jan 9
OPO12:30 pmPorto
28h 23m
2 stops
IAD11:53 amWashington, D.C. Dulles Intl
$504
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport 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 October 30, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 11/19

5:25 pm-11:15 am

1 stop12h 50m

Porto

Tue 12/16

12:30 pm-11:21 pm

2 stops15h 51m

$488

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 11/11

12:36 pm-10:30 am

2 stops16h 54m

Porto

Tue 11/18

11:15 am-12:16 am

2 stops18h 01m

$492

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Thu 2/12

5:30 pm-9:55 am

1 stop11h 25m

Porto

Wed 2/18

10:55 am-9:00 pm

1 stop15h 05m

$497

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 12/3

12:50 pm-11:40 am

2 stops17h 50m

Porto

Wed 12/10

6:00 am-8:26 pm

2 stops43h 26m

$499

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 12/3

12:50 pm-11:40 am

2 stops17h 50m

Porto

Wed 12/17

6:00 am-9:14 pm

2 stops20h 14m

$503

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Thu 1/15

6:00 pm-11:40 am

1 stop12h 40m

Porto

Sun 1/18

6:00 am-3:50 pm

1 stop14h 50m

$513

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Fri 2/20

6:00 pm-2:45 pm

1 stop15h 45m

Porto

Sat 2/28

6:00 am-3:50 pm

1 stop14h 50m

$516

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

Mon 12/8

8:00 pm-2:35 pm

1 stop23h 35m

$519

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 11/12

6:50 pm-10:30 am

1 stop10h 40m

Porto

Sun 11/16

11:25 am-7:15 pm

1 stop12h 50m

$533

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 3/8

7:59 pm-3:25 pm

2 stops15h 26m

Porto

Sat 3/14

4:10 pm-5:05 pm

1 stop28h 55m

$537

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. Dulles Intl Airport 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. Dulles Intl Airport and Porto?

What is the cheapest month to fly to Porto?

The month of February is, on average, the cheapest month to fly to Porto from Washington, D.C. Dulles Intl Airport, with most prices found around $543. If you aren’t able to travel during the month of February, then book flights to Porto from Washington, D.C. Dulles Intl Airport during October instead. Flights to Porto in October, while not as cheap as those in February, still average around $573.

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. Dulles Intl Airport 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. Dulles Intl Airport 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. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $749 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. Dulles Intl Airport for as low as $683 on momondo.

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

As of October 2025, prices for Washington, D.C. Dulles Intl Airport to Porto flights are approximately 30% cheaper when compared to flights at the same time last year.

When to book flights from Washington, D.C. Dulles Intl Airport to Porto

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport to Porto (IAD to OPO) flight deals and tips

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

Direct flights

None
There are no direct flights from Washington, D.C. Dulles Intl Airport to Porto. There are no popular flight routes from Washington, D.C. Dulles Intl Airport to Porto.
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  • How far is Washington, D.C. Dulles Intl to Porto by plane?

    Washington, D.C. Dulles Intl and Porto are 3541.8 mi apart from one another. Typically, this will take 10h 25m by plane in normal conditions.

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

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

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport to Porto?

Best airlines flying from Washington, D.C. Dulles Intl Airport to Porto

Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to Porto with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $493Free CancellationRating
7.4
8,996 reviews
Search United Airlines flights
TAP AIR PORTUGALPriceFrom $506Free CancellationRating
7.1
2,040 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $515Free CancellationRating
7.0
3,004 reviews
Search Iberia flights
DeltaPriceFrom $533Free CancellationRating
7.9
7,998 reviews
Search Delta flights
KLMPriceFrom $555Free CancellationRating
7.7
1,406 reviews
Search KLM flights
LufthansaPriceFrom $618Free CancellationRating
6.8
7,542 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
Braga
Matosinhos
Lamego
Esposende
Guimarães
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?

Finding the right flight to Porto from Washington, D.C. is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Porto quick and easy, saving you time and money.

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

Yes. momondo allows you to filter the results for Washington, D.C. to Porto flights to just show those with flexible booking policies.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Porto from Washington, D.C..

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

Price alerts on flights to Porto from Washington, D.C. are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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