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Cheap flights from Washington, D.C. Dulles Intl Airport to Porto from $277

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.
KLM Logo
7:40 pm - 10:35 amIAD  Washington, D.C. Dulles Intl-OPO Porto
10h 55m1 stop Paris Charles de Gaulle
KLM Logo
5:55 am - 7:20 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
18h 25m1 stop Paris Charles de Gaulle
$635KLM
Thu, Oct 29 - Wed, Nov 11
Delta Logo
7:40 pm - 10:35 amIAD  Washington, D.C. Dulles Intl-OPO Porto
10h 55m1 stop Paris Charles de Gaulle
Delta Logo
5:55 am - 4:30 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
15h 35m1 stop Paris Charles de Gaulle
$635Delta
Thu, Oct 29 - Tue, Nov 10
SWISS Logo
8:10 pm - 11:15 amIAD  Washington, D.C. Dulles Intl-OPO Porto
34h 05m1 stop Zurich
SWISS Logo
12:05 pm - 5:00 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
33h 55m1 stop Zurich
$638SWISS
Tue, Nov 24 - Mon, Nov 30
Delta Logo
7:40 pm - 10:35 amIAD  Washington, D.C. Dulles Intl-OPO Porto
10h 55m1 stop Paris Charles de Gaulle
Delta Logo
11:45 am - 3:35 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
32h 50m1 stop Amsterdam Schiphol
$640Delta
Sun, Mar 21 - Sun, Mar 28
Multiple Airlines Logo
10:10 pm - 9:30 amIAD  Washington, D.C. Dulles Intl-OPO Porto
31h 20m1 stop Newark
Multiple Airlines Logo
1:45 pm - 7:25 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
33h 40m1 stop Munich Franz Josef Strauss
$641Multiple Airlines
Sat, Mar 20 - Sat, Mar 27
KLM Logo
7:40 pm - 10:35 amIAD  Washington, D.C. Dulles Intl-OPO Porto
10h 55m1 stop Paris Charles de Gaulle
KLM Logo
5:00 am - 4:26 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
16h 26m2 stops Amsterdam Schiphol Detroit Metropolitan Wayne County
$644KLM
Thu, Oct 29 - Tue, Nov 10
TAP AIR PORTUGAL Logo
10:35 pm - 3:00 pmIAD  Washington, D.C. Dulles Intl-OPO Porto
11h 25m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
9:15 pm - 3:10 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
22h 55m1 stop Lisbon Humberto Delgado
$647TAP AIR PORTUGAL
Mon, Oct 12 - Mon, Oct 19
Lufthansa Logo
10:10 pm - 9:30 amIAD  Washington, D.C. Dulles Intl-OPO Porto
31h 20m1 stop Newark
Lufthansa Logo
6:00 am - 3:55 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
14h 55m1 stop Frankfurt am Main
$658Lufthansa
Sat, Mar 20 - Sun, Mar 28
TAP AIR PORTUGAL Logo
5:25 pm - 10:00 pmIAD  Washington, D.C. Dulles Intl-OPO Porto
23h 35m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
4:00 pm - 2:40 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
27h 40m1 stop Lisbon Humberto Delgado
$666TAP AIR PORTUGAL
Thu, Nov 5 - Mon, Nov 9
Lufthansa Logo
7:00 pm - 12:50 pmIAD  Washington, D.C. Dulles Intl-OPO Porto
13h 50m2 stops Frankfurt am Main Munich Franz Josef Strauss
Lufthansa Logo
6:20 am - 7:25 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
18h 05m1 stop Munich Franz Josef Strauss
$689Lufthansa
Sun, Mar 21 - Sun, Mar 28

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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 12
IAD10:35 pmWashington, D.C. Dulles Intl
11h 25m
1 stop
OPO3:00 pmPorto
Oct 19
OPO9:15 pmPorto
22h 55m
1 stop
IAD3:10 pmWashington, D.C. Dulles Intl
$647
TAP AIR PORTUGAL
Oct 14
IAD5:45 pmWashington, D.C. Dulles Intl
20h 15m
1 stop
OPO7:00 pmPorto
Nov 3
OPO5:00 amPorto
14h 40m
1 stop
IAD2:40 pmWashington, D.C. Dulles Intl
$690
TAP AIR PORTUGAL
Oct 14
IAD5:45 pmWashington, D.C. Dulles Intl
20h 15m
1 stop
OPO7:00 pmPorto
Nov 3
OPO5:00 amPorto
14h 40m
1 stop
IAD2:40 pmWashington, D.C. Dulles Intl
$691

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
Mar 1
IAD8:15 amWashington, D.C. Dulles Intl
20h 15m
1 stop
OPO9:30 amPorto
Mar 27
OPO12:30 pmPorto
30h 35m
1 stop
IAD3:05 pmWashington, D.C. Dulles Intl
$659
United Airlines
Nov 5
IAD6:00 pmWashington, D.C. Dulles Intl
12h 45m
1 stop
OPO11:45 amPorto
Nov 12
OPO6:00 amPorto
14h 55m
1 stop
IAD3:55 pmWashington, D.C. Dulles Intl
$662
United Airlines
Oct 31
IAD10:35 pmWashington, D.C. Dulles Intl
30h 55m
1 stop
OPO9:30 amPorto
Nov 7
OPO12:30 pmPorto
32h 25m
1 stop
IAD3:55 pmWashington, D.C. Dulles Intl
$666

momondo Fare Finder

 
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

Thu 10/29

7:40 pm-10:35 am

1 stop10h 55m

Porto

Wed 11/11

5:55 am-7:20 pm

1 stop18h 25m

$635
Quickest round-trip

Washington, D.C.Porto

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

IADOPO

Washington, D.C. Dulles Intl

Thu 10/29

7:40 pm-10:35 am

1 stop10h 55m

Porto

Tue 11/10

5:55 am-4:30 pm

1 stop15h 35m

$635

Washington, D.C.Porto

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

IADOPO

Washington, D.C. Dulles Intl

Tue 11/24

8:10 pm-11:15 am

1 stop34h 05m

Porto

Mon 11/30

12:05 pm-5:00 pm

1 stop33h 55m

$638

Washington, D.C.Porto

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

IADOPO

Washington, D.C. Dulles Intl

Sun 3/21

7:40 pm-10:35 am

1 stop10h 55m

Porto

Sun 3/28

11:45 am-3:35 pm

1 stop32h 50m

$640

Washington, D.C.Porto

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

IADOPO

Washington, D.C. Dulles Intl

Sat 3/20

10:10 pm-9:30 am

1 stop31h 20m

Porto

Sat 3/27

1:45 pm-7:25 pm

1 stop33h 40m

$641

Washington, D.C.Porto

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

IADOPO

Washington, D.C. Dulles Intl

Thu 10/29

7:40 pm-10:35 am

1 stop10h 55m

Porto

Tue 11/10

5:00 am-4:26 pm

2 stops16h 26m

$644

Washington, D.C.Porto

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

IADOPO

Washington, D.C. Dulles Intl

Mon 10/12

10:35 pm-3:00 pm

1 stop11h 25m

Porto

Mon 10/19

9:15 pm-3:10 pm

1 stop22h 55m

$647

Washington, D.C.Porto

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

IADOPO

Washington, D.C. Dulles Intl

Sat 3/20

10:10 pm-9:30 am

1 stop31h 20m

Porto

Sun 3/28

6:00 am-3:55 pm

1 stop14h 55m

$658

Washington, D.C.Porto

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

IADOPO

Washington, D.C. Dulles Intl

Thu 11/5

5:25 pm-10:00 pm

1 stop23h 35m

Porto

Mon 11/9

4:00 pm-2:40 pm

1 stop27h 40m

$666

Washington, D.C.Porto

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

IADOPO

Washington, D.C. Dulles Intl

Sun 3/21

7:00 pm-12:50 pm

2 stops13h 50m

Porto

Sun 3/28

6:20 am-7:25 pm

1 stop18h 05m

$689

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?

Prices are currently low for flights on this route.

Typical prices usually range from $709 to $1,072.
The lowest price recently found on this route was $635.

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 November instead. Flights to Porto in November, while not as cheap as those in January, still average around $666.

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 $843 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 $608 on momondo.

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

As of September 2026, prices for Washington, D.C. Dulles Intl Airport to Porto flights are approximately 22% 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

Best Price Found

$277

Fastest flight time

10h 50m

Direct flights

None
The best one-way flight to Porto from Washington, D.C. Dulles Intl Airport in the past 72 hours is $277. The best round-trip flight deal from Washington, D.C. Dulles Intl Airport to Porto found on momondo in the last 72 hours is $635.
The fastest flight from Washington, D.C. Dulles Intl Airport to Porto takes 10h 50m
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

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 10h 50m 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
1,575 reviews
Search KLM flights
TAP AIR PORTUGALPriceFrom $499Free CancellationRating
7.2
2,377 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $514Free CancellationRating
6.8
8,237 reviews
Search Lufthansa flights
United AirlinesPriceFrom $532Free CancellationRating
7.4
10,220 reviews
Search United Airlines flights
DeltaPriceFrom $533Free CancellationRating
7.8
8,593 reviews
Search Delta flights
Air FrancePriceFrom $642Free CancellationRating
7.5
1,650 reviews
Search Air France flights

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Coimbra
Vila Nova de Gaia
Aveiro
Braga
Pinhao
Matosinhos
Esposende
Chaves
Viseu
Arcos de Valdevez
Espinho
Guimarães
Lamego
Ponte de Lima
Penafiel
Caminha
Baiao
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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