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Cheap flights from Washington, D.C. Dulles Intl Airport to Porto from $325

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 4/24. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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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.
TAP AIR PORTUGAL Logo
10:35 pm - 7:00 pm
IAD
-
OPO
15h 25m
1 stop
TAP AIR PORTUGAL Logo
7:00 am - 3:10 pm
OPO
-
IAD
13h 10m
1 stop
$587TAP AIR PORTUGAL
Sun, Sep 13 - Thu, Sep 24
Turkish Airlines Logo
9:45 pm - 3:40 pm
IAD
-
OPO
36h 55m
1 stop
Turkish Airlines Logo
10:40 am - 7:50 pm
OPO
-
IAD
38h 10m
1 stop
$589Turkish Airlines
Tue, Apr 14 - Fri, Apr 24
Turkish Airlines Logo
9:45 pm - 11:30 pm
IAD
-
OPO
20h 45m
1 stop
Turkish Airlines Logo
6:10 am - 7:50 pm
OPO
-
IAD
18h 40m
1 stop
$594Turkish Airlines
Sat, Apr 25 - Thu, May 7
TAP AIR PORTUGAL Logo
10:50 pm - 8:25 pm
IAD
-
OPO
16h 35m
1 stop
TAP AIR PORTUGAL Logo
5:05 am - 8:05 pm
OPO
-
IAD
20h 00m
1 stop
$597TAP AIR PORTUGAL
Fri, Sep 4 - Sat, Sep 12
Turkish Airlines Logo
9:45 pm - 11:30 pm
IAD
-
OPO
20h 45m
1 stop
Turkish Airlines Logo
6:10 am - 7:50 pm
OPO
-
IAD
18h 40m
1 stop
$598Turkish Airlines
Sat, Apr 25 - Thu, May 7
Turkish Airlines Logo
1:20 pm - 3:40 pm
IAD
-
OPO
21h 20m
1 stop
Turkish Airlines Logo
4:40 pm - 11:35 am
OPO
-
IAD
23h 55m
1 stop
$606Turkish Airlines
Tue, Apr 7 - Wed, Apr 15
Turkish Airlines Logo
1:20 pm - 3:50 pm
IAD
-
OPO
21h 30m
1 stop
Turkish Airlines Logo
10:45 am - 11:35 am
OPO
-
IAD
29h 50m
1 stop
$607Turkish Airlines
Sun, Apr 12 - Wed, Apr 29
TAP AIR PORTUGAL Logo
5:45 pm - 10:10 am
IAD
-
OPO
11h 25m
1 stop
TAP AIR PORTUGAL Logo
12:00 pm - 8:35 pm
OPO
-
IAD
13h 35m
1 stop
$608TAP AIR PORTUGAL
Wed, Aug 19 - Fri, Aug 28
TAP AIR PORTUGAL Logo
10:35 pm - 8:25 pm
IAD
-
OPO
16h 50m
1 stop
TAP AIR PORTUGAL Logo
9:00 am - 3:10 pm
OPO
-
IAD
11h 10m
1 stop
$611TAP AIR PORTUGAL
Sun, May 3 - Sun, May 10
Turkish Airlines Logo
9:45 pm - 3:40 pm
IAD
-
OPO
36h 55m
1 stop
Turkish Airlines Logo
4:40 pm - 11:35 am
OPO
-
IAD
23h 55m
1 stop
$616Turkish Airlines
Mon, Apr 13 - Sun, Apr 19

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

Our best Turkish Airlines deals on Washington, D.C. Dulles Intl Airport to Porto flight tickets
Turkish Airlines
Apr 14
IAD9:45 pmWashington, D.C. Dulles Intl
36h 55m
1 stop
OPO3:40 pmPorto
Apr 24
OPO10:40 amPorto
38h 10m
1 stop
IAD7:50 pmWashington, D.C. Dulles Intl
$589
Turkish Airlines
Apr 25
IAD9:45 pmWashington, D.C. Dulles Intl
20h 45m
1 stop
OPO11:30 pmPorto
May 7
OPO6:10 amPorto
18h 40m
1 stop
IAD7:50 pmWashington, D.C. Dulles Intl
$594
Turkish Airlines
Apr 25
IAD9:45 pmWashington, D.C. Dulles Intl
20h 45m
1 stop
OPO11:30 pmPorto
May 7
OPO6:10 amPorto
18h 40m
1 stop
IAD7:50 pmWashington, D.C. Dulles Intl
$598

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
Sep 13
IAD5:40 pmWashington, D.C. Dulles Intl
11h 20m
1 stop
OPO10:00 amPorto
Sep 22
OPO9:00 amPorto
11h 10m
1 stop
IAD3:10 pmWashington, D.C. Dulles Intl
$587
TAP AIR PORTUGAL
Sep 4
IAD10:50 pmWashington, D.C. Dulles Intl
16h 35m
1 stop
OPO8:25 pmPorto
Sep 12
OPO5:05 amPorto
20h 00m
1 stop
IAD8:05 pmWashington, D.C. Dulles Intl
$597
TAP AIR PORTUGAL
Aug 19
IAD5:45 pmWashington, D.C. Dulles Intl
11h 25m
1 stop
OPO10:10 amPorto
Aug 28
OPO12:00 pmPorto
13h 35m
1 stop
IAD8:35 pmWashington, D.C. Dulles Intl
$608

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 March 24, 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 - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 9/13

10:35 pm-7:00 pm

1 stop15h 25m

Porto

Thu 9/24

7:00 am-3:10 pm

1 stop13h 10m

$587

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 4/14

9:45 pm-3:40 pm

1 stop36h 55m

Porto

Fri 4/24

10:40 am-7:50 pm

1 stop38h 10m

$589

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sat 4/25

9:45 pm-11:30 pm

1 stop20h 45m

Porto

Thu 5/7

6:10 am-7:50 pm

1 stop18h 40m

$594

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Fri 9/4

10:50 pm-8:25 pm

1 stop16h 35m

Porto

Sat 9/12

5:05 am-8:05 pm

1 stop20h 00m

$597

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sat 4/25

9:45 pm-11:30 pm

1 stop20h 45m

Porto

Thu 5/7

6:10 am-7:50 pm

1 stop18h 40m

$598

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 4/7

1:20 pm-3:40 pm

1 stop21h 20m

Porto

Wed 4/15

4:40 pm-11:35 am

1 stop23h 55m

$606

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 4/12

1:20 pm-3:50 pm

1 stop21h 30m

Porto

Wed 4/29

10:45 am-11:35 am

1 stop29h 50m

$607
Quickest round-trip

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 8/19

5:45 pm-10:10 am

1 stop11h 25m

Porto

Fri 8/28

12:00 pm-8:35 pm

1 stop13h 35m

$608

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 5/3

10:35 pm-8:25 pm

1 stop16h 50m

Porto

Sun 5/10

9:00 am-3:10 pm

1 stop11h 10m

$611

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Mon 4/13

9:45 pm-3:40 pm

1 stop36h 55m

Porto

Sun 4/19

4:40 pm-11:35 am

1 stop23h 55m

$616

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 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 $543. 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 November instead. Flights to Porto in November, while not as cheap as those in October, still average around $543.

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 $727 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 $644 on momondo.

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

As of March 2026, prices for Washington, D.C. Dulles Intl Airport to Porto flights are approximately 38% 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

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.
Search flight deals

  • 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
1,477 reviews
Search KLM flights
TAP AIR PORTUGALPriceFrom $490Free CancellationRating
7.1
2,175 reviews
Search TAP AIR PORTUGAL flights
United AirlinesPriceFrom $494Free CancellationRating
7.4
9,469 reviews
Search United Airlines flights
IberiaPriceFrom $515Free CancellationRating
7.0
3,150 reviews
Search Iberia flights
DeltaPriceFrom $533Free CancellationRating
7.9
8,320 reviews
Search Delta flights
LufthansaPriceFrom $564Free CancellationRating
6.8
7,864 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
Esposende
Lamego
Chaves
Pinhao
Guimarães
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
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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