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Cheap flights from Washington, D.C. Dulles Intl Airport to Porto from $255

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.
TAP AIR PORTUGAL Logo
10:20 pm - 3:00 pmIAD-OPO
11h 40m1 stop
TAP AIR PORTUGAL Logo
10:35 pm - 3:20 pmOPO-IAD
21h 45m1 stop
$501TAP AIR PORTUGAL
Find Deal
Thu, Sep 18 - Mon, Sep 22
TAP AIR PORTUGAL Logo
10:20 pm - 11:00 pmIAD-OPO
19h 40m1 stop
TAP AIR PORTUGAL Logo
9:15 pm - 3:20 pmOPO-IAD
23h 05m1 stop
$502TAP AIR PORTUGAL
Find Deal
Thu, Sep 18 - Mon, Sep 22
TAP AIR PORTUGAL Logo
5:50 pm - 10:55 amIAD-OPO
12h 05m1 stop
TAP AIR PORTUGAL Logo
9:15 pm - 8:50 pmOPO-IAD
28h 35m1 stop
$508TAP AIR PORTUGAL
Find Deal
Thu, Sep 25 - Sun, Oct 5
United Airlines Logo
5:25 pm - 9:45 amIAD-OPO
11h 20m1 stop
United Airlines Logo
12:50 pm - 11:53 amOPO-IAD
28h 03m2 stops
$690United Airlines
Find Deal
Tue, Jul 8 - Tue, Jul 22
United Airlines Logo
4:00 pm - 9:35 amIAD-OPO
12h 35m2 stops
United Airlines Logo
12:10 pm - 11:55 amOPO-IAD
28h 45m2 stops
$700United Airlines
Find Deal
Mon, Jun 16 - Thu, Jun 26
Delta Logo
5:10 pm - 3:30 pmIAD-OPO
17h 20m2 stops
Delta Logo
5:00 am - 11:00 pmOPO-IAD
22h 00m2 stops
$720Delta
Find Deal
Wed, Oct 15 - Wed, Oct 29
KLM Logo
6:30 pm - 3:30 pmIAD-OPO
16h 00m1 stop
KLM Logo
4:20 pm - 3:35 pmOPO-IAD
28h 15m1 stop
$726KLM
Find Deal
Mon, Jul 7 - Tue, Jul 15
Delta Logo
5:10 pm - 3:30 pmIAD-OPO
17h 20m2 stops
Delta Logo
6:15 am - 11:00 pmOPO-IAD
21h 45m2 stops
$729Delta
Find Deal
Wed, Oct 1 - Wed, Oct 8
Air France Logo
8:33 pm - 3:30 pmIAD-OPO
13h 57m2 stops
Air France Logo
9:20 am - 7:15 pmOPO-IAD
14h 55m1 stop
$806Air France
Find Deal
Wed, Jul 2 - Sat, Jul 12
KLM Logo
5:25 pm - 3:35 pmIAD-OPO
17h 10m1 stop
KLM Logo
11:25 am - 3:35 pmOPO-IAD
33h 10m1 stop
$811KLM
Find Deal
Thu, Jun 26 - Thu, Jul 3

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

Our best British Airways deals on Washington, D.C. Dulles Intl Airport to Porto flight tickets
British Airways
Oct 8
IAD7:25 pmWashington, D.C. Dulles Intl
15h 30m
2 stops
OPO3:55 pmPorto
Oct 22
OPO8:15 amPorto
11h 45m
1 stop
IAD3:00 pmWashington, D.C. Dulles Intl
British Airways
Apr 25
IAD8:14 pmWashington, D.C. Dulles Intl
30h 21m
2 stops
OPO7:35 amPorto
May 3
OPO8:15 amPorto
11h 45m
1 stop
IAD3:00 pmWashington, D.C. Dulles Intl

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 18
IAD10:20 pmWashington, D.C. Dulles Intl
11h 40m
1 stop
OPO3:00 pmPorto
Sep 22
OPO10:35 pmPorto
21h 45m
1 stop
IAD3:20 pmWashington, D.C. Dulles Intl
TAP AIR PORTUGAL
Sep 18
IAD10:20 pmWashington, D.C. Dulles Intl
19h 40m
1 stop
OPO11:00 pmPorto
Sep 22
OPO9:15 pmPorto
23h 05m
1 stop
IAD3:20 pmWashington, D.C. Dulles Intl
TAP AIR PORTUGAL
Sep 25
IAD5:50 pmWashington, D.C. Dulles Intl
12h 05m
1 stop
OPO10:55 amPorto
Oct 5
OPO9:15 pmPorto
28h 35m
1 stop
IAD8:50 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 $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 18 weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $727 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 $632 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

$255

Fastest flight time

10h 00m

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 $255. The best round-trip flight deal from Washington, D.C. Dulles Intl Airport to Porto found on momondo in the last 72 hours is $501.
The fastest flight from Washington, D.C. Dulles Intl Airport to Porto takes 10h 00m
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 10h 00m 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
1,442 reviews
Search Air France flights
DeltaPriceFrom $423Free CancellationRating
8.0
7,920 reviews
Search Delta flights
KLMPriceFrom $435Free CancellationRating
7.8
1,333 reviews
Search KLM flights
TAP AIR PORTUGALPriceFrom $457Free CancellationRating
7.1
1,844 reviews
Search TAP AIR PORTUGAL flights
United AirlinesPriceFrom $538Free CancellationRating
7.4
8,685 reviews
Search United Airlines flights
American AirlinesPriceFrom $567Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
IberiaPriceFrom $579Free CancellationRating
7.0
2,684 reviews
Search Iberia flights
LufthansaPriceFrom $603Free CancellationRating
6.7
7,027 reviews
Search Lufthansa flights

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Coimbra
Aveiro
Matosinhos
Vila Nova de Gaia
Caminha
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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