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Cheap flights from Washington, D.C. Dulles Intl Airport to Porto from $257

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 8/18. 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

KAYAK's recommended round-trip deals from the most popular airlines that fly from Washington, D.C. Dulles Intl Airport to Porto.
5:50 pm - 10:00 amIAD-OPO
11h 10m1 stop
10:00 am - 8:50 pmOPO-IAD
15h 50m1 stop
$537TAP AIR PORTUGAL
Find Deal
Wed, Sep 24 - Tue, Oct 7
10:20 pm - 3:00 pmIAD-OPO
11h 40m1 stop
9:00 am - 3:20 pmOPO-IAD
11h 20m1 stop
$555TAP AIR PORTUGAL
Find Deal
Mon, Sep 8 - Wed, Sep 24
9:55 am - 9:25 amIAD-OPO
18h 30m1 stop
6:00 am - 2:35 pmOPO-IAD
13h 35m1 stop
$610United Airlines
Find Deal
Wed, Sep 17 - Tue, Dec 23
12:35 pm - 9:25 amIAD-OPO
15h 50m2 stops
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
$615United Airlines
Find Deal
Wed, Sep 17 - Wed, Dec 24
12:30 pm - 3:30 pmIAD-OPO
22h 00m2 stops
11:15 am - 3:45 pmOPO-IAD
33h 30m1 stop
$626Delta
Find Deal
Sun, Sep 14 - Wed, Dec 24
9:20 pm - 3:30 pmIAD-OPO
13h 10m1 stop
5:00 am - 3:45 pmOPO-IAD
15h 45m1 stop
$637Delta
Find Deal
Tue, Sep 16 - Thu, Dec 25
5:25 pm - 4:45 pmIAD-OPO
18h 20m1 stop
4:20 pm - 3:35 pmOPO-IAD
28h 15m1 stop
$721KLM
Find Deal
Sun, Jun 8 - Wed, Jun 18
10:20 pm - 11:20 pmIAD-OPO
20h 00m1 stop
6:15 am - 7:25 pmOPO-IAD
18h 10m1 stop
$744Lufthansa
Find Deal
Wed, May 14 - Sun, Jun 1
10:20 pm - 11:20 pmIAD-OPO
20h 00m1 stop
6:15 am - 3:50 pmOPO-IAD
14h 35m2 stops
$760Lufthansa
Find Deal
Sun, Apr 27 - Sun, May 4
9:20 pm - 3:30 pmIAD-OPO
13h 10m1 stop
5:30 pm - 3:35 pmOPO-IAD
27h 05m1 stop
$774KLM
Find Deal
Thu, May 15 - Mon, Jun 2

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
Sep 17
IAD9:55 amWashington, D.C. Dulles Intl
18h 30m
1 stop
OPO9:25 amPorto
Dec 23
OPO6:00 amPorto
13h 35m
1 stop
IAD2:35 pmWashington, D.C. Dulles Intl
United Airlines
Sep 17
IAD12:35 pmWashington, D.C. Dulles Intl
15h 50m
2 stops
OPO9:25 amPorto
Dec 24
OPO6:00 amPorto
14h 50m
1 stop
IAD3:50 pmWashington, D.C. Dulles Intl
United Airlines
Sep 15
IAD9:55 amWashington, D.C. Dulles Intl
18h 40m
1 stop
OPO9:35 amPorto
Dec 23
OPO6:00 amPorto
14h 50m
1 stop
IAD3:50 pmWashington, D.C. Dulles Intl

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

Our best Delta deals on Washington, D.C. Dulles Intl Airport to Porto flight tickets
Delta
Sep 14
IAD12:30 pmWashington, D.C. Dulles Intl
22h 00m
2 stops
OPO3:30 pmPorto
Dec 24
OPO11:15 amPorto
33h 30m
1 stop
IAD3:45 pmWashington, D.C. Dulles Intl
Delta
Sep 16
IAD9:20 pmWashington, D.C. Dulles Intl
13h 10m
1 stop
OPO3:30 pmPorto
Dec 25
OPO5:00 amPorto
15h 45m
1 stop
IAD3:45 pmWashington, D.C. Dulles Intl
Delta
Sep 16
IAD5:10 pmWashington, D.C. Dulles Intl
17h 20m
2 stops
OPO3:30 pmPorto
Dec 24
OPO11:15 amPorto
33h 30m
1 stop
IAD3:45 pmWashington, D.C. Dulles Intl

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 $538. 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 $555.

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 18 weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $733 when searching 18 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 $655 on momondo.

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

As of April 2025, prices for Washington, D.C. Dulles Intl Airport to Porto flights are approximately 42% 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

Best Price Found

$257

Fastest flight time

9h 30m

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 $257. The best round-trip flight deal from Washington, D.C. Dulles Intl Airport to Porto found on momondo in the last 72 hours is $537.
The fastest flight from Washington, D.C. Dulles Intl Airport to Porto takes 9h 30m
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)

  • 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 9h 30m 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
Air FrancePriceFrom $422Free CancellationRating
7.4
1,425 reviews
Search Air France flights
DeltaPriceFrom $423Free CancellationRating
8.0
7,899 reviews
Search Delta flights
KLMPriceFrom $435Free CancellationRating
7.8
1,321 reviews
Search KLM flights
TAP AIR PORTUGALPriceFrom $458Free CancellationRating
7.1
1,831 reviews
Search TAP AIR PORTUGAL flights
United AirlinesPriceFrom $538Free CancellationRating
7.4
8,615 reviews
Search United Airlines flights
LufthansaPriceFrom $538Free CancellationRating
6.7
6,961 reviews
Search Lufthansa flights
American AirlinesPriceFrom $567Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
IberiaPriceFrom $579Free CancellationRating
7.0
2,655 reviews
Search Iberia flights

Traveling to a place near Porto?

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

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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