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Cheap flights from Washington, D.C. Dulles Intl Airport to Porto from $241

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 11/28. 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

United Airlines Logo
5:33 pm - 9:30 amIAD-OPO
10h 57m1 stop
United Airlines Logo
12:35 pm - 8:57 pmOPO-IAD
13h 22m1 stop
$544United Airlines
Find Deal
Thu, Nov 6 - Mon, Nov 17
British Airways Logo
9:45 pm - 7:00 pmIAD-OPO
16h 15m1 stop
British Airways Logo
5:30 pm - 4:35 pmOPO-IAD
27h 05m1 stop
$547British Airways
Find Deal
Fri, Mar 6 - Tue, Mar 10
Delta Logo
6:30 pm - 3:30 pmIAD-OPO
16h 00m1 stop
Delta Logo
11:10 am - 7:15 pmOPO-IAD
13h 05m1 stop
$553Delta
Find Deal
Tue, Oct 7 - Tue, Nov 4
Delta Logo
9:20 pm - 3:30 pmIAD-OPO
13h 10m1 stop
Delta Logo
6:05 am - 4:05 pmOPO-IAD
15h 00m1 stop
$554Delta
Find Deal
Tue, Oct 7 - Tue, Nov 4
Lufthansa Logo
10:55 pm - 10:25 pmIAD-OPO
18h 30m2 stops
Lufthansa Logo
1:45 pm - 8:05 pmOPO-IAD
35h 20m1 stop
$556Lufthansa
Find Deal
Fri, Nov 7 - Tue, Nov 11
TAP AIR PORTUGAL Logo
10:30 pm - 5:00 pmIAD-OPO
13h 30m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 3:35 pmOPO-IAD
12h 40m1 stop
$563TAP AIR PORTUGAL
Find Deal
Fri, Mar 6 - Tue, Mar 10
KLM Logo
9:20 pm - 3:30 pmIAD-OPO
13h 10m1 stop
KLM Logo
11:25 am - 4:35 pmOPO-IAD
34h 10m1 stop
$566KLM
Find Deal
Tue, Oct 7 - Mon, Nov 3
Lufthansa Logo
7:00 pm - 2:45 pmIAD-OPO
15h 45m1 stop
Lufthansa Logo
6:00 am - 9:09 pmOPO-IAD
19h 09m2 stops
$568Lufthansa
Find Deal
Thu, Mar 12 - Tue, Mar 17
TAP AIR PORTUGAL Logo
5:30 pm - 10:10 amIAD-OPO
11h 40m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 3:35 pmOPO-IAD
12h 40m1 stop
$570TAP AIR PORTUGAL
Find Deal
Tue, Mar 3 - Tue, Mar 10
KLM Logo
6:30 pm - 3:30 pmIAD-OPO
16h 00m1 stop
KLM Logo
11:25 am - 4:35 pmOPO-IAD
34h 10m1 stop
$591KLM
Find Deal
Tue, Oct 7 - Mon, Nov 3

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
Oct 7
IAD6:30 pmWashington, D.C. Dulles Intl
16h 00m
1 stop
OPO3:30 pmPorto
Nov 4
OPO11:10 amPorto
13h 05m
1 stop
IAD7:15 pmWashington, D.C. Dulles Intl
$553
Find similar
Delta
Oct 7
IAD9:20 pmWashington, D.C. Dulles Intl
13h 10m
1 stop
OPO3:30 pmPorto
Nov 4
OPO6:05 amPorto
15h 00m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
$554
Find similar
Delta
Oct 7
IAD9:20 pmWashington, D.C. Dulles Intl
13h 10m
1 stop
OPO3:30 pmPorto
Nov 4
OPO11:10 amPorto
29h 47m
2 stops
IAD11:57 amWashington, D.C. Dulles Intl
$564
Find similar

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

Our best SWISS deals on Washington, D.C. Dulles Intl Airport to Porto flight tickets
SWISS
Oct 7
IAD8:45 pmWashington, D.C. Dulles Intl
30h 00m
1 stop
OPO7:45 amPorto
Nov 5
OPO12:10 pmPorto
33h 30m
1 stop
IAD4:40 pmWashington, D.C. Dulles Intl
$549
Find similar
SWISS
Nov 7
IAD8:30 pmWashington, D.C. Dulles Intl
33h 20m
1 stop
OPO10:50 amPorto
Nov 16
OPO6:35 pmPorto
51h 05m
2 stops
IAD4:40 pmWashington, D.C. Dulles Intl
$550
Find similar
SWISS
Nov 7
IAD8:30 pmWashington, D.C. Dulles Intl
33h 20m
1 stop
OPO10:50 amPorto
Nov 15
OPO12:00 pmPorto
33h 40m
1 stop
IAD4:40 pmWashington, D.C. Dulles Intl
$551
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 September 16, 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

Thu 11/6

5:33 pm-9:30 am

1 stop10h 57m

Porto

Mon 11/17

12:35 pm-8:57 pm

1 stop13h 22m

$544

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Fri 3/6

9:45 pm-7:00 pm

1 stop16h 15m

Porto

Tue 3/10

5:30 pm-4:35 pm

1 stop27h 05m

$547

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 10/7

6:30 pm-3:30 pm

1 stop16h 00m

Porto

Tue 11/4

11:10 am-7:15 pm

1 stop13h 05m

$553

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 10/7

9:20 pm-3:30 pm

1 stop13h 10m

Porto

Tue 11/4

6:05 am-4:05 pm

1 stop15h 00m

$554

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Fri 11/7

10:55 pm-10:25 pm

2 stops18h 30m

Porto

Tue 11/11

1:45 pm-8:05 pm

1 stop35h 20m

$556

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Fri 3/6

10:30 pm-5:00 pm

1 stop13h 30m

Porto

Tue 3/10

6:55 am-3:35 pm

1 stop12h 40m

$563

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 10/7

9:20 pm-3:30 pm

1 stop13h 10m

Porto

Mon 11/3

11:25 am-4:35 pm

1 stop34h 10m

$566

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Thu 3/12

7:00 pm-2:45 pm

1 stop15h 45m

Porto

Tue 3/17

6:00 am-9:09 pm

2 stops19h 09m

$568

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 3/3

5:30 pm-10:10 am

1 stop11h 40m

Porto

Tue 3/10

6:55 am-3:35 pm

1 stop12h 40m

$570

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 10/7

6:30 pm-3:30 pm

1 stop16h 00m

Porto

Mon 11/3

11:25 am-4:35 pm

1 stop34h 10m

$591

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 October is, on average, the cheapest month to fly to Porto from Washington, D.C. Dulles Intl Airport, with most prices found around $530. If you aren’t able to travel during the month of October, then book flights to Porto from Washington, D.C. Dulles Intl Airport during February instead. Flights to Porto in February, while not as cheap as those in October, still average around $543.

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 $735 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 $672 on momondo.

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

As of September 2025, prices for Washington, D.C. Dulles Intl Airport to Porto flights are approximately 22% more expensive 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 57m 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
DeltaPriceFrom $418Free CancellationRating
7.9
7,957 reviews
Search Delta flights
KLMPriceFrom $430Free CancellationRating
7.8
1,386 reviews
Search KLM flights
TAP AIR PORTUGALPriceFrom $469Free CancellationRating
7.1
1,975 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $515Free CancellationRating
7.0
2,924 reviews
Search Iberia flights
United AirlinesPriceFrom $543Free CancellationRating
7.4
8,924 reviews
Search United Airlines flights
LufthansaPriceFrom $629Free CancellationRating
6.8
7,407 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
Aveiro
Coimbra
Braga
Matosinhos
Caminha
Guimarães
Esposende
Lamego
Chaves
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
Pinhao
Santa Maria da Feira
Curia
Penafiel
Mesao Frio
Mira

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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