DCA - OPO

$377 Find Cheap Flights from Reagan Washington National Airport to Porto

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Reagan-National to Porto departing on 2/27. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Porto

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Porto, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Porto, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$445
United Airlines
Tue 2/24Tue 3/3
DCA - OPO • 1 stop
Cheapest one-way
$429
United Airlines
Fri 2/27
DCA - OPO • 1 stop
Top airlines
United Airlines
Cheapest • from $445 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
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+1
Airline reviews
Airline reviews
+1
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We hope you love your trip to Porto!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Reagan-National to Porto (DCA-OPO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Reagan-National to Porto that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Reagan-National to Porto

Tue, Feb 24 - Tue, Mar 3
United Airlines Logo
4:10 pm - 9:30 amDCA-OPO
12h 20m1 stop
United Airlines Logo
12:35 pm - 7:35 pmOPO-DCA
12h 00m1 stop
$445United Airlines
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Sun, Jan 18 - Tue, Feb 3
Air Canada Logo
11:05 am - 12:50 pmDCA-OPO
20h 45m2 stops
Air Canada Logo
6:00 am - 8:55 amOPO-DCA
31h 55m2 stops
$446Air Canada
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Tue, Feb 24 - Tue, Mar 3
British Airways Logo
7:45 pm - 5:35 pmDCA-OPO
16h 50m2 stops
British Airways Logo
8:20 am - 6:58 pmOPO-DCA
15h 38m2 stops
$451British Airways
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Tue, Feb 24 - Tue, Mar 3
Iberia Logo
3:21 pm - 11:45 amDCA-OPO
15h 24m2 stops
Iberia Logo
8:20 am - 10:35 pmOPO-DCA
19h 15m2 stops
$460Iberia
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Mon, Jan 12 - Mon, Jan 26
Air Canada Logo
6:00 am - 12:05 pmDCA-OPO
25h 05m2 stops
Air Canada Logo
6:00 am - 10:23 amOPO-DCA
57h 23m2 stops
$469Air Canada
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Thu, Jan 15 - Thu, Jan 22
Air Canada Logo
6:00 am - 12:05 pmDCA-OPO
25h 05m2 stops
Air Canada Logo
6:00 am - 8:55 amOPO-DCA
31h 55m2 stops
$471Air Canada
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Tue, Feb 24 - Tue, Mar 3
United Airlines Logo
6:00 pm - 9:30 amDCA-OPO
10h 30m1 stop
United Airlines Logo
12:30 pm - 7:35 pmOPO-DCA
36h 05m2 stops
$478United Airlines
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Wed, Mar 4 - Tue, Mar 10
British Airways Logo
1:54 pm - 4:05 pmDCA-OPO
21h 11m2 stops
British Airways Logo
5:30 pm - 4:37 pmOPO-DCA
27h 07m2 stops
$479British Airways
Find Deal
Tue, Jan 13 - Wed, Jan 21
British Airways Logo
7:31 pm - 5:45 pmDCA-OPO
17h 14m2 stops
British Airways Logo
6:35 pm - 4:50 pmOPO-DCA
27h 15m2 stops
$481British Airways
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Sat, Jan 10 - Mon, Jan 19
British Airways Logo
8:45 pm - 4:40 pmDCA-OPO
38h 55m2 stops
British Airways Logo
5:30 pm - 4:50 pmOPO-DCA
28h 20m2 stops
$486British Airways
Find Deal
Booking Insights

KAYAK's insights & trends for Reagan-National to Porto flights

Get data-powered insights and trends into flights from Reagan-National to Porto to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Reagan Washington National Airport to Porto?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Reagan Washington National Airport to Porto were found on United Airlines ($445) and Air Canada ($446).

Which airlines fly non-stop between Washington, D.C. Reagan-National Airport and Porto?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Washington, D.C. Reagan-National Airport to Porto.

There is just one airline that flies from Washington, D.C. Reagan-National Airport to Porto direct and that is United Airlines. The best round-trip deal found from United Airlines for the route is $520.

Find deals

Good to know

Cheapest flight$429
Flight from Reagan Washington National Airport to Porto

When to book flights from Reagan-National to Porto

Are your dates flexible? Find out the best times to travel from Reagan-National to Porto based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Reagan Washington National Airport to Porto flights

  • What is the cheapest flight from Washington, D.C. Reagan-National Airport to Porto?

    In the last 3 days, the lowest price for a flight from Washington, D.C. Reagan-National Airport to Porto was $377 for a one-way ticket and $445 for a round-trip.

  • Do I need a passport to fly between Reagan Washington National Airport and Porto?

    Yes, you’ll need a passport to travel to Porto from Reagan Washington National Airport.

  • Which airports will I be using when flying from Reagan Washington National Airport to Porto?

    When flying out of Reagan Washington National Airport you will be using Washington, D.C. Reagan-National. You will be landing at Porto, also known as Porto.

  • Which aircraft models fly most regularly from Reagan Washington National Airport to Porto?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Reagan Washington National Airport to Porto?

    Star Alliance is the only airline alliance operating flights between Reagan Washington National Airport and Porto.

  • How does KAYAK find such low prices on flights from Reagan Washington National Airport to Porto?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Reagan Washington National Airport to Porto.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Reagan Washington National Airport to Porto?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto from Reagan Washington National Airport is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Reagan Washington National Airport to Porto?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Porto with an airline and back to Reagan Washington National Airport with another airline. Booking your flights between Reagan Washington National Airport and OPO can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Reagan Washington National Airport to Porto?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Porto from Reagan Washington National Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Reagan-National to Porto

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Porto. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Reagan-National to Porto? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9063 reviews
7.7Boarding
8.1Crew
7.3Comfort
6.6Food
7.1Entertainment
Airline reviews

Starlink wifi on the Embraer E175 is an excellent experience. I was able to connect and work from IAD all the way to approach into BTV.

10.0 ExcellentDavid, Nov 2025IAD - BTV
Read more United Airlines reviews

Starlink wifi on the Embraer E175 is an excellent experience. I was able to connect and work from IAD all the way to approach into BTV.

7 hours delayed due to operational issues on United’s end. Basically laziness.

Short flight but an "eager to help" crew made the journey more enjoyable!

During booking, I kept trying submitting my payment from the Mexican website and it didn't work. After I had the idea to change it to the Canadian website, it worked but I had to be charged the equivalent of 50 CAD more. I received the clear instruction that I would only be able to check-in at the airport and that it was impossible to select a seat 24 hours before departure, that I had to pay 144 CAD to do so, although not only was I able to check-in 24 hours before departure, but I could have selected my seats for free then. All in all, I almost threw $200 out the window due to misleading information. Besides, the app kept crashing, the information to get to the gate on the app was inaccurate, my gate was switched and I was only informed once in the air (luckily I had noticed the departure pannel), I was not addressed in my language beforehand and even if I tried I was immediately answered in English (which meant the crew understood but didn't want to answer accordingly), there was only one snack & beverage service on my medium haul flight and no beverage service on my short haul flight. To be fair, the planes were comfortable, the crew apart from the language issue was helpful, dynamic and engaging, the plane was clean and the directions were clear and direct. United has a lot of potential to be one of my favourite airlines, but the devil is in the details and a lot of them missed the target.

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

Food was poorly timed and not good.. Hand held snacks, really. I kept asking for water and never got any. Service was rushed for a 7-hour flight.

Great service on board. Boarding a bit slow due to process. Food was pretty average.

Very small cramped plane for an international flight. Everything else was good, but it was maybe the smallest comfort-wise I've ever been on for longer than 3-4 hours and the trip was 7.5

Flight was delayed 3 hours. No food and drink vouchers was provided. They offered a mini pretzel bag and water .

Staff was rude. Didn’t give water for 2 hours. Worst service

Everything you need to know for your flight from Reagan-National to Porto

Information on your arrival and departure airports

Reagan Washington National Airport (DCA)
Porto (OPO)