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Cheap flights from Washington, D.C. Dulles Intl Airport to Porto from $269

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 9/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

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.
TAP AIR PORTUGAL Logo
10:35 pm - 5:00 pmIAD  Washington, D.C. Dulles Intl-OPO Porto
13h 25m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
9:15 pm - 8:35 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
28h 20m1 stop Lisbon Humberto Delgado
$676TAP AIR PORTUGAL
Tue, Oct 6 - Sun, Oct 11
TAP AIR PORTUGAL Logo
6:25 pm - 12:30 amIAD  Washington, D.C. Dulles Intl-OPO Porto
26h 05m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
7:00 am - 2:45 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
12h 45m1 stop Lisbon Humberto Delgado
$679TAP AIR PORTUGAL
Thu, Oct 29 - Tue, Nov 3
Iberia Logo
6:05 pm - 4:00 pmIAD  Washington, D.C. Dulles Intl-OPO Porto
16h 55m2 stops London Heathrow Madrid Barajas
Iberia Logo
8:20 am - 4:20 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
13h 00m1 stop Madrid Barajas
$707Iberia
Tue, Nov 3 - Thu, Nov 12
Multiple Airlines Logo
4:30 pm - 12:50 pmIAD  Washington, D.C. Dulles Intl-OPO Porto
15h 20m2 stops Toronto Pearson Intl Munich Franz Josef Strauss
Multiple Airlines Logo
8:20 am - 4:20 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
13h 00m1 stop Madrid Barajas
$714Multiple Airlines
Tue, Nov 24 - Mon, Nov 30
Multiple Airlines Logo
6:00 pm - 11:45 amIAD  Washington, D.C. Dulles Intl-OPO Porto
12h 45m1 stop Frankfurt am Main
Multiple Airlines Logo
8:20 am - 4:20 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
13h 00m1 stop Madrid Barajas
$718Multiple Airlines
Tue, Nov 24 - Mon, Nov 30
United Airlines Logo
8:37 am - 9:30 amIAD  Washington, D.C. Dulles Intl-OPO Porto
19h 53m1 stop Newark
United Airlines Logo
6:00 am - 3:55 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
14h 55m1 stop Frankfurt am Main
$731United Airlines
Sun, Nov 8 - Wed, Nov 11
United Airlines Logo
8:37 am - 9:30 amIAD  Washington, D.C. Dulles Intl-OPO Porto
19h 53m1 stop Newark
United Airlines Logo
6:00 am - 3:55 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
14h 55m1 stop Frankfurt am Main
$731United Airlines
Sun, Nov 8 - Tue, Nov 17
Delta Logo
6:40 pm - 10:35 amIAD  Washington, D.C. Dulles Intl-OPO Porto
10h 55m1 stop Paris Charles de Gaulle
Delta Logo
11:15 am - 3:45 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
33h 30m1 stop Amsterdam Schiphol
$733Delta
Mon, Nov 9 - Wed, Nov 11
Delta Logo
6:20 pm - 9:05 amIAD  Washington, D.C. Dulles Intl-OPO Porto
9h 45m1 stop New York John F Kennedy Intl
Delta Logo
11:15 am - 3:45 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
33h 30m1 stop Amsterdam Schiphol
$733Delta
Wed, Nov 25 - Wed, Dec 2
Iberia Logo
6:50 pm - 11:45 amIAD  Washington, D.C. Dulles Intl-OPO Porto
12h 55m1 stop Madrid Barajas
Iberia Logo
8:20 am - 5:20 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
13h 00m1 stop Madrid Barajas
$821Iberia
Mon, Oct 26 - Fri, Oct 30

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

Our best TAP AIR PORTUGAL deals on Washington, D.C. Dulles Intl Airport to Porto flight tickets
TAP AIR PORTUGAL
Oct 6
IAD10:35 pmWashington, D.C. Dulles Intl
13h 25m
1 stop
OPO5:00 pmPorto
Oct 11
OPO9:15 pmPorto
28h 20m
1 stop
IAD8:35 pmWashington, D.C. Dulles Intl
$676
TAP AIR PORTUGAL
Nov 2
IAD5:25 pmWashington, D.C. Dulles Intl
11h 50m
1 stop
OPO10:15 amPorto
Nov 13
OPO2:30 pmPorto
11h 05m
1 stop
IAD8:35 pmWashington, D.C. Dulles Intl
$679
TAP AIR PORTUGAL
Oct 5
IAD5:40 pmWashington, D.C. Dulles Intl
24h 15m
1 stop
OPO10:55 pmPorto
Oct 11
OPO9:00 amPorto
11h 10m
1 stop
IAD3:10 pmWashington, D.C. Dulles Intl
$690

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
Aug 16
IAD12:35 pmWashington, D.C. Dulles Intl
16h 10m
1 stop
OPO9:45 amPorto
Aug 25
OPO12:15 pmPorto
28h 11m
2 stops
IAD11:26 amWashington, D.C. Dulles Intl
$962
United Airlines
Aug 12
IAD12:43 pmWashington, D.C. Dulles Intl
13h 17m
1 stop
OPO7:00 amPorto
Aug 27
OPO6:00 amPorto
14h 15m
1 stop
IAD3:15 pmWashington, D.C. Dulles Intl
$963

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 August 7, 2026.
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

Cheapest round-trip

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Tue 10/6

10:35 pm-5:00 pm

1 stop13h 25m

Porto

Sun 10/11

9:15 pm-8:35 pm

1 stop28h 20m

$676

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Thu 10/29

6:25 pm-12:30 am

1 stop26h 05m

Porto

Tue 11/3

7:00 am-2:45 pm

1 stop12h 45m

$679

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Tue 11/3

6:05 pm-4:00 pm

2 stops16h 55m

Porto

Thu 11/12

8:20 am-4:20 pm

1 stop13h 00m

$707

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Tue 11/24

4:30 pm-12:50 pm

2 stops15h 20m

Porto

Mon 11/30

8:20 am-4:20 pm

1 stop13h 00m

$714
Quickest round-trip

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Tue 11/24

6:00 pm-11:45 am

1 stop12h 45m

Porto

Mon 11/30

8:20 am-4:20 pm

1 stop13h 00m

$718

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Sun 11/8

8:37 am-9:30 am

1 stop19h 53m

Porto

Wed 11/11

6:00 am-3:55 pm

1 stop14h 55m

$731

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Sun 11/8

8:37 am-9:30 am

1 stop19h 53m

Porto

Tue 11/17

6:00 am-3:55 pm

1 stop14h 55m

$731

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Mon 11/9

6:40 pm-10:35 am

1 stop10h 55m

Porto

Wed 11/11

11:15 am-3:45 pm

1 stop33h 30m

$733

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Wed 11/25

6:20 pm-9:05 am

1 stop9h 45m

Porto

Wed 12/2

11:15 am-3:45 pm

1 stop33h 30m

$733

Washington, D.C.Porto

IAD Washington, D.C. Dulles Intl - OPO Porto

IADOPO

Washington, D.C. Dulles Intl

Mon 10/26

6:50 pm-11:45 am

1 stop12h 55m

Porto

Fri 10/30

8:20 am-5:20 pm

1 stop13h 00m

$821

Flights are sorted by cheapest round-trip flights 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?

Prices are currently low for flights on this route.

Typical prices usually range from $696 to $914.
The lowest price recently found on this route was $676.

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. Dulles Intl Airport, with most prices found around $613. If you aren’t able to travel during the month of January, 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 January, still average around $625.

How far in advance should I book a flight from Washington, D.C. Dulles Intl Airport 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 $832 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 $721 on momondo.

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

As of August 2026, prices for Washington, D.C. Dulles Intl Airport to Porto flights are approximately 3% 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

Fastest flight time

9h 55m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to Porto takes 9h 55m
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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Frequently asked questions about flying from Washington, D.C. Dulles Intl Airport to Porto

  • 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 9h 55m 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
KLMPriceFrom $477Free CancellationRating
7.8
1,555 reviews
Search KLM flights
United AirlinesPriceFrom $480Free CancellationRating
7.4
10,080 reviews
Search United Airlines flights
TAP AIR PORTUGALPriceFrom $500Free CancellationRating
7.2
2,358 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $514Free CancellationRating
6.8
8,178 reviews
Search Lufthansa flights
DeltaPriceFrom $533Free CancellationRating
7.8
8,497 reviews
Search Delta flights
IberiaPriceFrom $602Free CancellationRating
7.0
3,264 reviews
Search Iberia 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
Braga
Aveiro
Matosinhos
Pinhao
Esposende
Lamego
Chaves
Arcos de Valdevez
Guimarães
Viseu
Espinho
Ponte de Lima
Mesao Frio
Penafiel
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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