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Cheap flights from Washington, D.C. Dulles Intl Airport to Porto from $367

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 9/21. 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
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.
Turkish Airlines Logo
9:45 pm - 3:45 pm
IAD
-
OPO
37h 00m
1 stop
Turkish Airlines Logo
4:40 pm - 7:50 pm
OPO
-
IAD
32h 10m
1 stop
$709Turkish Airlines
Wed, Sep 23 - Thu, Oct 1
Turkish Airlines Logo
9:45 pm - 11:30 pm
IAD
-
OPO
20h 45m
1 stop
Turkish Airlines Logo
4:50 pm - 11:35 am
OPO
-
IAD
23h 45m
1 stop
$713Turkish Airlines
Tue, Sep 8 - Tue, Sep 15
Multiple Airlines Logo
8:15 am - 7:00 am
IAD
-
OPO
17h 45m
2 stops
Multiple Airlines Logo
8:40 pm - 7:55 pm
OPO
-
IAD
28h 15m
2 stops
$729Multiple Airlines
Wed, Oct 21 - Mon, Nov 9
United Airlines Logo
8:30 am - 7:00 am
IAD
-
OPO
17h 30m
2 stops
United Airlines Logo
6:00 am - 3:50 pm
OPO
-
IAD
14h 50m
1 stop
$735United Airlines
Wed, Oct 21 - Tue, Nov 10
Turkish Airlines Logo
1:20 pm - 3:50 pm
IAD
-
OPO
21h 30m
1 stop
Turkish Airlines Logo
6:10 am - 11:35 am
OPO
-
IAD
34h 25m
1 stop
$740Turkish Airlines
Mon, Aug 3 - Thu, Sep 3
United Airlines Logo
8:30 am - 7:00 am
IAD
-
OPO
17h 30m
2 stops
United Airlines Logo
12:30 pm - 12:14 am
OPO
-
IAD
16h 44m
2 stops
$745United Airlines
Wed, Oct 21 - Tue, Nov 10
Turkish Airlines Logo
9:45 pm - 3:40 pm
IAD
-
OPO
36h 55m
1 stop
Turkish Airlines Logo
6:30 am - 11:35 am
OPO
-
IAD
34h 05m
1 stop
$746Turkish Airlines
Thu, Sep 17 - Mon, Sep 21
Turkish Airlines Logo
1:20 pm - 11:30 pm
IAD
-
OPO
29h 10m
1 stop
Turkish Airlines Logo
6:30 am - 11:35 am
OPO
-
IAD
34h 05m
1 stop
$748Turkish Airlines
Thu, Sep 17 - Mon, Sep 21
TAP AIR PORTUGAL Logo
10:35 pm - 5:00 pm
IAD
-
OPO
13h 25m
1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 3:10 pm
OPO
-
IAD
21h 40m
1 stop
$749TAP AIR PORTUGAL
Sun, Aug 16 - Tue, Aug 25
Turkish Airlines Logo
9:45 pm - 3:45 pm
IAD
-
OPO
37h 00m
1 stop
Turkish Airlines Logo
4:50 pm - 11:35 am
OPO
-
IAD
23h 45m
1 stop
$750Turkish Airlines
Wed, Sep 2 - Mon, Sep 7

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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
Oct 21
IAD8:35 amWashington, D.C. Dulles Intl
17h 25m
2 stops
OPO7:00 amPorto
Nov 10
OPO6:00 amPorto
14h 50m
1 stop
IAD3:50 pmWashington, D.C. Dulles Intl
$735
United Airlines
Oct 21
IAD8:30 amWashington, D.C. Dulles Intl
17h 30m
2 stops
OPO7:00 amPorto
Nov 10
OPO12:30 pmPorto
16h 44m
2 stops
IAD12:14 amWashington, D.C. Dulles Intl
$745
United Airlines
Oct 13
IAD9:45 amWashington, D.C. Dulles Intl
16h 15m
1 stop
OPO7:00 amPorto
Oct 20
OPO12:15 pmPorto
28h 40m
2 stops
IAD11:55 amWashington, D.C. Dulles Intl
$760

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
Aug 16
IAD10:35 pmWashington, D.C. Dulles Intl
13h 25m
1 stop
OPO5:00 pmPorto
Aug 25
OPO10:30 pmPorto
21h 40m
1 stop
IAD3:10 pmWashington, D.C. Dulles Intl
$749
TAP AIR PORTUGAL
Aug 31
IAD10:35 pmWashington, D.C. Dulles Intl
13h 25m
1 stop
OPO5:00 pmPorto
Sep 8
OPO7:00 amPorto
13h 10m
1 stop
IAD3:10 pmWashington, D.C. Dulles Intl
$774
TAP AIR PORTUGAL
Aug 8
IAD10:35 pmWashington, D.C. Dulles Intl
15h 25m
1 stop
OPO7:00 pmPorto
Aug 29
OPO9:00 amPorto
11h 10m
1 stop
IAD3:10 pmWashington, D.C. Dulles Intl
$780

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 May 4, 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

Wed 9/23

9:45 pm-3:45 pm

1 stop37h 00m

Porto

Thu 10/1

4:40 pm-7:50 pm

1 stop32h 10m

$709

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 9/8

9:45 pm-11:30 pm

1 stop20h 45m

Porto

Tue 9/15

4:50 pm-11:35 am

1 stop23h 45m

$713

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 10/21

8:15 am-7:00 am

2 stops17h 45m

Porto

Mon 11/9

8:40 pm-7:55 pm

2 stops28h 15m

$729
Quickest round-trip

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 10/21

8:30 am-7:00 am

2 stops17h 30m

Porto

Tue 11/10

6:00 am-3:50 pm

1 stop14h 50m

$735

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Mon 8/3

1:20 pm-3:50 pm

1 stop21h 30m

Porto

Thu 9/3

6:10 am-11:35 am

1 stop34h 25m

$740

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 10/21

8:30 am-7:00 am

2 stops17h 30m

Porto

Tue 11/10

12:30 pm-12:14 am

2 stops16h 44m

$745

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Thu 9/17

9:45 pm-3:40 pm

1 stop36h 55m

Porto

Mon 9/21

6:30 am-11:35 am

1 stop34h 05m

$746

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Thu 9/17

1:20 pm-11:30 pm

1 stop29h 10m

Porto

Mon 9/21

6:30 am-11:35 am

1 stop34h 05m

$748

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 8/16

10:35 pm-5:00 pm

1 stop13h 25m

Porto

Tue 8/25

10:30 pm-3:10 pm

1 stop21h 40m

$749

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 9/2

9:45 pm-3:45 pm

1 stop37h 00m

Porto

Mon 9/7

4:50 pm-11:35 am

1 stop23h 45m

$750

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 $564. 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 January instead. Flights to Porto in January, while not as cheap as those in October, still average around $613.

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 $773 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 $629 on momondo.

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

As of May 2026, prices for Washington, D.C. Dulles Intl Airport to Porto flights are approximately 3% 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.
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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 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
KLMPriceFrom $477Free CancellationRating
7.8
1,511 reviews
Search KLM flights
United AirlinesPriceFrom $493Free CancellationRating
7.4
9,680 reviews
Search United Airlines flights
TAP AIR PORTUGALPriceFrom $497Free CancellationRating
7.2
2,230 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $514Free CancellationRating
6.8
7,972 reviews
Search Lufthansa flights
IberiaPriceFrom $515Free CancellationRating
7.0
3,208 reviews
Search Iberia flights
DeltaPriceFrom $533Free CancellationRating
7.9
8,461 reviews
Search Delta 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
Lamego
Esposende
Chaves
Pinhao
Guimarães
Espinho
Arcos de Valdevez
Ponte de Lima
Viseu
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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