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Cheap flights from Washington, D.C. Dulles Intl Airport to Porto from $294

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 1/30. 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.
Lufthansa Logo
5:40 pm - 12:50 pm
IAD
-
OPO
14h 10m1 stop
Lufthansa Logo
6:00 am - 2:35 pm
OPO
-
IAD
13h 35m1 stop
$436Lufthansa
mar., janv. 20 - mar., janv. 27
SWISS Logo
10:15 pm - 11:15 am
IAD
-
OPO
32h 00m2 stops
SWISS Logo
12:05 pm - 4:40 pm
OPO
-
IAD
33h 35m1 stop
$442SWISS
lun., janv. 12 - lun., janv. 19
SWISS Logo
5:45 pm - 11:15 am
IAD
-
OPO
12h 30m1 stop
SWISS Logo
7:25 pm - 3:05 pm
OPO
-
IAD
24h 40m1 stop
$444SWISS
mer., févr. 18 - mar., févr. 24
Multiple Airlines Logo
5:45 pm - 12:05 pm
IAD
-
OPO
13h 20m1 stop
Multiple Airlines Logo
6:00 am - 3:50 pm
OPO
-
IAD
14h 50m1 stop
$457Multiple Airlines
mar., janv. 20 - mar., janv. 27
Multiple Airlines Logo
5:45 pm - 12:05 pm
IAD
-
OPO
13h 20m1 stop
Multiple Airlines Logo
12:05 pm - 4:40 pm
OPO
-
IAD
33h 35m1 stop
$458Multiple Airlines
lun., janv. 12 - lun., janv. 19
Lufthansa Logo
6:00 pm - 11:40 am
IAD
-
OPO
12h 40m1 stop
Lufthansa Logo
1:45 pm - 3:35 pm
OPO
-
IAD
30h 50m1 stop
$459Lufthansa
lun., janv. 12 - lun., janv. 19
Multiple Airlines Logo
4:30 pm - 1:15 pm
IAD
-
OPO
15h 45m2 stops
Multiple Airlines Logo
6:00 am - 3:50 pm
OPO
-
IAD
14h 50m1 stop
$461Multiple Airlines
mer., févr. 25 - mer., mars 4
Multiple Airlines Logo
9:45 am - 12:05 pm
IAD
-
OPO
21h 20m2 stops
Multiple Airlines Logo
12:05 pm - 4:40 pm
OPO
-
IAD
33h 35m1 stop
$462Multiple Airlines
lun., janv. 12 - lun., janv. 19
SWISS Logo
8:30 pm - 11:15 am
IAD
-
OPO
33h 45m1 stop
SWISS Logo
12:10 pm - 4:40 pm
OPO
-
IAD
33h 30m1 stop
$463SWISS
mar., janv. 13 - mer., janv. 21
Multiple Airlines Logo
9:45 am - 12:05 pm
IAD
-
OPO
21h 20m2 stops
Multiple Airlines Logo
12:05 pm - 4:40 pm
OPO
-
IAD
33h 35m1 stop
$464Multiple Airlines
lun., janv. 12 - lun., janv. 26

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

Our best Lufthansa deals on Washington, D.C. Dulles Intl Airport to Porto flight tickets
Lufthansa
Jan 20
IAD5:40 pmWashington, D.C. Dulles Intl
14h 10m
1 stop
OPO12:50 pmPorto
Jan 27
OPO6:00 amPorto
13h 35m
1 stop
IAD2:35 pmWashington, D.C. Dulles Intl
$436
Find similar
Lufthansa
Jan 12
IAD6:00 pmWashington, D.C. Dulles Intl
12h 40m
1 stop
OPO11:40 amPorto
Jan 19
OPO1:45 pmPorto
30h 50m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
$459
Find similar
Lufthansa
Jan 14
IAD5:40 pmWashington, D.C. Dulles Intl
14h 35m
1 stop
OPO1:15 pmPorto
Jan 22
OPO6:00 amPorto
13h 35m
1 stop
IAD2:35 pmWashington, D.C. Dulles Intl
$475
Find similar

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
Jan 12
IAD10:15 pmWashington, D.C. Dulles Intl
32h 00m
2 stops
OPO11:15 amPorto
Jan 19
OPO12:05 pmPorto
33h 35m
1 stop
IAD4:40 pmWashington, D.C. Dulles Intl
$442
Find similar
SWISS
Feb 18
IAD5:45 pmWashington, D.C. Dulles Intl
12h 30m
1 stop
OPO11:15 amPorto
Feb 24
OPO7:25 pmPorto
24h 40m
1 stop
IAD3:05 pmWashington, D.C. Dulles Intl
$444
Find similar
SWISS
Jan 13
IAD8:30 pmWashington, D.C. Dulles Intl
33h 45m
1 stop
OPO11:15 amPorto
Jan 21
OPO12:10 pmPorto
33h 30m
1 stop
IAD4:40 pmWashington, D.C. Dulles Intl
$463
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 décembre 18, 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. 1/20

5:40 pm-12:50 pm

1 stop14h 10m

Porto

mar. 1/27

6:00 am-2:35 pm

1 stop13h 35m

$436

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

lun. 1/12

10:15 pm-11:15 am

2 stops32h 00m

Porto

lun. 1/19

12:05 pm-4:40 pm

1 stop33h 35m

$442

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

mer. 2/18

5:45 pm-11:15 am

1 stop12h 30m

Porto

mar. 2/24

7:25 pm-3:05 pm

1 stop24h 40m

$444

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

mar. 1/20

5:45 pm-12:05 pm

1 stop13h 20m

Porto

mar. 1/27

6:00 am-3:50 pm

1 stop14h 50m

$457

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

lun. 1/12

5:45 pm-12:05 pm

1 stop13h 20m

Porto

lun. 1/19

12:05 pm-4:40 pm

1 stop33h 35m

$458

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

lun. 1/12

6:00 pm-11:40 am

1 stop12h 40m

Porto

lun. 1/19

1:45 pm-3:35 pm

1 stop30h 50m

$459

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

mer. 2/25

4:30 pm-1:15 pm

2 stops15h 45m

Porto

mer. 3/4

6:00 am-3:50 pm

1 stop14h 50m

$461

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

lun. 1/12

9:45 am-12:05 pm

2 stops21h 20m

Porto

lun. 1/19

12:05 pm-4:40 pm

1 stop33h 35m

$462

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

mar. 1/13

8:30 pm-11:15 am

1 stop33h 45m

Porto

mer. 1/21

12:10 pm-4:40 pm

1 stop33h 30m

$463

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

lun. 1/12

9:45 am-12:05 pm

2 stops21h 20m

Porto

lun. 1/26

12:05 pm-4:40 pm

1 stop33h 35m

$464

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 $551.

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 $719 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 $663 on momondo.

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

11h 25m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to Porto takes 11h 25m
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 11h 25m 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
8,005 reviews
Search Delta flights
SWISSPriceFrom $444Free CancellationRating
7.5
1,815 reviews
Search SWISS flights
United AirlinesPriceFrom $493Free CancellationRating
7.4
9,093 reviews
Search United Airlines flights
TAP AIR PORTUGALPriceFrom $504Free CancellationRating
7.2
2,091 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $515Free CancellationRating
7.0
3,053 reviews
Search Iberia flights
KLMPriceFrom $555Free CancellationRating
7.7
1,428 reviews
Search KLM flights
LufthansaPriceFrom $615Free CancellationRating
6.8
7,635 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
Braga
Aveiro
Matosinhos
Guimarães
Esposende
Lamego
Chaves
Viseu
Espinho
Ponte de Lima
Arcos de Valdevez
Pinhao
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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