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Cheap flights from Washington, D.C. Dulles Intl Airport to Porto from $241

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 10/6. 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

Logo
9:45 am - 3:00 pmIAD-OPO
24h 15m2 stops
Logo
11:50 am - 4:15 pmOPO-IAD
33h 25m2 stops
$474
Find Deal
mar., sep. 23 - mar., sep. 30
Logo
8:30 pm - 11:15 amIAD-OPO
33h 45m1 stop
Logo
6:00 am - 8:29 pmOPO-IAD
19h 29m2 stops
$476
Find Deal
dom., nov. 9 - mié., nov. 19
United Airlines Logo
5:33 pm - 9:30 amIAD-OPO
10h 57m1 stop
United Airlines Logo
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
$481United Airlines
Find Deal
dom., nov. 9 - jue., nov. 20
Logo
9:55 am - 12:05 pmIAD-OPO
21h 10m2 stops
Logo
6:00 am - 8:29 pmOPO-IAD
19h 29m2 stops
$482
Find Deal
lun., nov. 17 - mar., nov. 25
Logo
10:20 pm - 10:35 pmIAD-OPO
19h 15m2 stops
Logo
11:50 am - 3:20 pmOPO-IAD
32h 30m2 stops
$485
Find Deal
dom., sep. 21 - mar., oct. 7
United Airlines Logo
5:33 pm - 9:30 amIAD-OPO
10h 57m1 stop
United Airlines Logo
12:30 pm - 7:27 amOPO-IAD
23h 57m2 stops
$491United Airlines
Find Deal
mié., nov. 5 - mar., nov. 11
TAP AIR PORTUGAL Logo
10:20 pm - 5:00 pmIAD-OPO
13h 40m1 stop
TAP AIR PORTUGAL Logo
7:00 am - 3:20 pmOPO-IAD
13h 20m1 stop
$505TAP AIR PORTUGAL
Find Deal
dom., sep. 7 - dom., sep. 14
TAP AIR PORTUGAL Logo
10:20 pm - 3:20 pmIAD-OPO
12h 00m1 stop
TAP AIR PORTUGAL Logo
10:00 am - 8:50 pmOPO-IAD
15h 50m1 stop
$507TAP AIR PORTUGAL
Find Deal
dom., sep. 14 - mar., sep. 23
KLM Logo
6:50 pm - 10:30 amIAD-OPO
10h 40m1 stop
KLM Logo
11:25 am - 11:00 pmOPO-IAD
16h 35m2 stops
$523KLM
Find Deal
dom., nov. 2 - mar., nov. 11
Delta Logo
12:30 pm - 10:30 amIAD-OPO
17h 00m2 stops
Delta Logo
6:30 am - 7:11 pmOPO-IAD
17h 41m2 stops
$542Delta
Find Deal
mié., nov. 19 - vie., nov. 28

Air Canada flights from Washington, D.C. Dulles Intl Airport to Porto

Our best Air Canada deals on Washington, D.C. Dulles Intl Airport to Porto flight tickets
Air Canada
Nov 5
IAD1:20 pmWashington, D.C. Dulles Intl
16h 55m
2 stops
OPO11:15 amPorto
Nov 11
OPO6:00 amPorto
20h 20m
2 stops
IAD9:20 pmWashington, D.C. Dulles Intl
$503
Find similar
Air Canada
Nov 16
IAD1:20 pmWashington, D.C. Dulles Intl
17h 45m
2 stops
OPO12:05 pmPorto
Nov 25
OPO6:00 amPorto
19h 29m
2 stops
IAD8:29 pmWashington, D.C. Dulles Intl
$511
Find similar

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 7
IAD10:20 pmWashington, D.C. Dulles Intl
13h 40m
1 stop
OPO5:00 pmPorto
Sep 14
OPO7:00 amPorto
13h 20m
1 stop
IAD3:20 pmWashington, D.C. Dulles Intl
$505
Find similar
TAP AIR PORTUGAL
Sep 14
IAD10:20 pmWashington, D.C. Dulles Intl
12h 00m
1 stop
OPO3:20 pmPorto
Sep 23
OPO10:00 amPorto
15h 50m
1 stop
IAD8:50 pmWashington, D.C. Dulles Intl
$507
Find similar
TAP AIR PORTUGAL
Oct 14
IAD5:00 pmWashington, D.C. Dulles Intl
12h 00m
1 stop
OPO10:00 amPorto
Oct 23
OPO11:00 amPorto
14h 50m
1 stop
IAD8:50 pmWashington, D.C. Dulles Intl
$513
Find similar

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 julio 31, 2025.
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

mar. 9/23

9:45 am-3:00 pm

2 stops24h 15m

Porto

mar. 9/30

11:50 am-4:15 pm

2 stops33h 25m

$474

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

dom. 11/9

8:30 pm-11:15 am

1 stop33h 45m

Porto

mié. 11/19

6:00 am-8:29 pm

2 stops19h 29m

$476

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

dom. 11/9

5:33 pm-9:30 am

1 stop10h 57m

Porto

jue. 11/20

6:00 am-3:50 pm

1 stop14h 50m

$481

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

lun. 11/17

9:55 am-12:05 pm

2 stops21h 10m

Porto

mar. 11/25

6:00 am-8:29 pm

2 stops19h 29m

$482

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

dom. 9/21

10:20 pm-10:35 pm

2 stops19h 15m

Porto

mar. 10/7

11:50 am-3:20 pm

2 stops32h 30m

$485

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

mié. 11/5

5:33 pm-9:30 am

1 stop10h 57m

Porto

mar. 11/11

12:30 pm-7:27 am

2 stops23h 57m

$491

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

dom. 9/7

10:20 pm-5:00 pm

1 stop13h 40m

Porto

dom. 9/14

7:00 am-3:20 pm

1 stop13h 20m

$505

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

dom. 9/14

10:20 pm-3:20 pm

1 stop12h 00m

Porto

mar. 9/23

10:00 am-8:50 pm

1 stop15h 50m

$507

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

dom. 11/2

6:50 pm-10:30 am

1 stop10h 40m

Porto

mar. 11/11

11:25 am-11:00 pm

2 stops16h 35m

$523

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

mié. 11/19

12:30 pm-10:30 am

2 stops17h 00m

Porto

vie. 11/28

6:30 am-7:11 pm

2 stops17h 41m

$542

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 February 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 February, 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 February, still average around $554.

What is the cheapest day to depart on your flight to Porto?

The cheapest day to depart on your flight to Porto is on a Sunday when prices can be found for as low as $613. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $779. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

What is the cheapest time of day to depart on your flight to Porto?

In the afternoon is the cheapest time of day to fly from Washington, D.C. Dulles Intl Airport to Porto when you can find flight prices for as low as $698. Flying to Porto in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $836 on average. Flights to Porto from Washington, D.C. Dulles Intl Airport at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 $733 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 $640 on momondo.

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

As of July 2025, 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

$241

Fastest flight time

10h 40m

Direct flights

None

Airports in Porto

1 airport
The best one-way flight to Porto from Washington, D.C. Dulles Intl Airport in the past 72 hours is $241. The best round-trip flight deal from Washington, D.C. Dulles Intl Airport to Porto found on momondo in the last 72 hours is $474.
The fastest flight from Washington, D.C. Dulles Intl Airport to Porto takes 10h 40m
There are no direct flights from Washington, D.C. Dulles Intl Airport to Porto. Popular non-direct route for this connection is Washington, D.C. Dulles Intl Airport - Porto Airport.
There is 1 airport near Porto: Porto (OPO)
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 40m 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 $418Free CancellationRating
8.0
7,981 reviews
Search Delta flights
KLMPriceFrom $424Free CancellationRating
7.8
1,383 reviews
Search KLM flights
TAP AIR PORTUGALPriceFrom $473Free CancellationRating
7.1
1,933 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $515Free CancellationRating
7.0
2,859 reviews
Search Iberia flights
SWISSPriceFrom $542Free CancellationRating
7.5
1,686 reviews
Search SWISS flights
United AirlinesPriceFrom $543Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights
American AirlinesPriceFrom $573Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
LufthansaPriceFrom $603Free CancellationRating
6.8
7,275 reviews
Search Lufthansa flights

Traveling to a place near Porto?

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