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Cheap flights from Washington, D.C. Dulles Intl Airport to Porto from $297

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 3/2. 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.
TAP AIR PORTUGAL Logo
5:30 pm - 6:55 pm
IAD
-
OPO
20h 25m
1 stop
TAP AIR PORTUGAL Logo
6:55 am - 2:35 pm
OPO
-
IAD
12h 40m
1 stop
$480TAP AIR PORTUGAL
Tue, Feb 24 - Tue, Mar 3
TAP AIR PORTUGAL Logo
10:30 pm - 5:00 pm
IAD
-
OPO
13h 30m
1 stop
TAP AIR PORTUGAL Logo
8:00 pm - 3:35 pm
OPO
-
IAD
23h 35m
1 stop
$497TAP AIR PORTUGAL
Sun, Feb 22 - Mon, Mar 9
TAP AIR PORTUGAL Logo
10:30 pm - 7:00 pm
IAD
-
OPO
15h 30m
1 stop
TAP AIR PORTUGAL Logo
8:00 pm - 4:15 pm
OPO
-
IAD
24h 15m
1 stop
$500TAP AIR PORTUGAL
Sun, Feb 22 - Sun, Mar 8
TAP AIR PORTUGAL Logo
5:30 pm - 10:10 am
IAD
-
OPO
11h 40m
1 stop
TAP AIR PORTUGAL Logo
7:00 am - 3:15 pm
OPO
-
IAD
13h 15m
1 stop
$506TAP AIR PORTUGAL
Tue, Feb 24 - Thu, Mar 5
TAP AIR PORTUGAL Logo
5:05 pm - 7:00 pm
IAD
-
OPO
20h 55m
1 stop
TAP AIR PORTUGAL Logo
10:25 pm - 3:05 pm
OPO
-
IAD
21h 40m
1 stop
$510TAP AIR PORTUGAL
Tue, Apr 7 - Wed, Apr 15
TAP AIR PORTUGAL Logo
5:40 pm - 9:00 am
IAD
-
OPO
10h 20m
1 stop
TAP AIR PORTUGAL Logo
10:25 pm - 8:35 pm
OPO
-
IAD
27h 10m
1 stop
$513TAP AIR PORTUGAL
Sun, Apr 5 - Wed, Apr 15
TAP AIR PORTUGAL Logo
5:05 pm - 7:00 pm
IAD
-
OPO
20h 55m
1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 8:35 pm
OPO
-
IAD
27h 05m
1 stop
$514TAP AIR PORTUGAL
Tue, Apr 7 - Tue, Apr 14
TAP AIR PORTUGAL Logo
10:30 pm - 1:05 pm
IAD
-
OPO
9h 35m
1 stop
TAP AIR PORTUGAL Logo
6:55 am - 2:35 pm
OPO
-
IAD
12h 40m
1 stop
$515TAP AIR PORTUGAL
Wed, Feb 18 - Tue, Feb 24
TAP AIR PORTUGAL Logo
5:30 pm - 10:10 am
IAD
-
OPO
11h 40m
1 stop
TAP AIR PORTUGAL Logo
6:55 am - 4:15 pm
OPO
-
IAD
13h 20m
1 stop
$526TAP AIR PORTUGAL
Tue, Feb 24 - Mon, Mar 9
SWISS Logo
8:20 pm - 7:55 am
IAD
-
OPO
30h 35m
1 stop
SWISS Logo
8:40 am - 4:45 pm
OPO
-
IAD
13h 05m
1 stop
$536SWISS
Wed, Apr 15 - Fri, May 1

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
Feb 24
IAD5:30 pmWashington, D.C. Dulles Intl
14h 40m
1 stop
OPO1:10 pmPorto
Mar 3
OPO6:55 amPorto
12h 40m
1 stop
IAD2:35 pmWashington, D.C. Dulles Intl
$480
TAP AIR PORTUGAL
Feb 8
IAD10:30 pmWashington, D.C. Dulles Intl
15h 30m
1 stop
OPO7:00 pmPorto
Feb 23
OPO4:10 pmPorto
27h 25m
1 stop
IAD2:35 pmWashington, D.C. Dulles Intl
$483
TAP AIR PORTUGAL
Feb 22
IAD10:30 pmWashington, D.C. Dulles Intl
13h 30m
1 stop
OPO5:00 pmPorto
Mar 9
OPO8:00 pmPorto
23h 35m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
$497

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
Apr 15
IAD8:20 pmWashington, D.C. Dulles Intl
30h 35m
1 stop
OPO7:55 amPorto
May 1
OPO8:40 amPorto
13h 05m
1 stop
IAD4:45 pmWashington, D.C. Dulles Intl
$536
SWISS
May 5
IAD8:20 pmWashington, D.C. Dulles Intl
30h 35m
1 stop
OPO7:55 amPorto
May 14
OPO7:20 pmPorto
26h 25m
1 stop
IAD4:45 pmWashington, D.C. Dulles Intl
$549
SWISS
May 13
IAD8:20 pmWashington, D.C. Dulles Intl
30h 35m
1 stop
OPO7:55 amPorto
May 19
OPO8:40 amPorto
13h 05m
1 stop
IAD4:45 pmWashington, D.C. Dulles Intl
$555

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 February 2, 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

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 2/24

5:30 pm-6:55 pm

1 stop20h 25m

Porto

Tue 3/3

6:55 am-2:35 pm

1 stop12h 40m

$480

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 2/22

10:30 pm-5:00 pm

1 stop13h 30m

Porto

Mon 3/9

8:00 pm-3:35 pm

1 stop23h 35m

$497

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 2/22

10:30 pm-7:00 pm

1 stop15h 30m

Porto

Sun 3/8

8:00 pm-4:15 pm

1 stop24h 15m

$500

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 2/24

5:30 pm-10:10 am

1 stop11h 40m

Porto

Thu 3/5

7:00 am-3:15 pm

1 stop13h 15m

$506

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 4/7

5:05 pm-7:00 pm

1 stop20h 55m

Porto

Wed 4/15

10:25 pm-3:05 pm

1 stop21h 40m

$510

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 4/5

5:40 pm-9:00 am

1 stop10h 20m

Porto

Wed 4/15

10:25 pm-8:35 pm

1 stop27h 10m

$513

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 4/7

5:05 pm-7:00 pm

1 stop20h 55m

Porto

Tue 4/14

10:30 pm-8:35 pm

1 stop27h 05m

$514

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 2/18

10:30 pm-1:05 pm

1 stop9h 35m

Porto

Tue 2/24

6:55 am-2:35 pm

1 stop12h 40m

$515

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 2/24

5:30 pm-10:10 am

1 stop11h 40m

Porto

Mon 3/9

6:55 am-4:15 pm

1 stop13h 20m

$526

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 4/15

8:20 pm-7:55 am

1 stop30h 35m

Porto

Fri 5/1

8:40 am-4:45 pm

1 stop13h 05m

$536

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 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 November instead. Flights to Porto in November, while not as cheap as those in October, still average around $593.

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 $718 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 $665 on momondo.

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

As of February 2026, prices for Washington, D.C. Dulles Intl Airport to Porto flights are approximately 141% 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

10h 20m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to Porto takes 10h 20m
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 10h 20m 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 $439Free CancellationRating
7.9
8,135 reviews
Search Delta flights
SWISSPriceFrom $444Free CancellationRating
7.6
1,864 reviews
Search SWISS flights
KLMPriceFrom $477Free CancellationRating
7.7
1,448 reviews
Search KLM flights
United AirlinesPriceFrom $494Free CancellationRating
7.4
9,231 reviews
Search United Airlines flights
TAP AIR PORTUGALPriceFrom $496Free CancellationRating
7.1
2,133 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $514Free CancellationRating
6.8
7,758 reviews
Search Lufthansa flights
IberiaPriceFrom $515Free CancellationRating
7.0
3,101 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
Esposende
Lamego
Guimarães
Espinho
Chaves
Pinhao
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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