OPO - WAS

$294 Find Cheap Flights from Porto to Washington, D.C.

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Porto to Washington, D.C. departing on 9/30. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Washington, D.C.

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

Cheap Flights from Porto to Washington, D.C. (OPO-WAS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Porto to Washington, D.C. 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 Porto to Washington, D.C.

Thu, Sep 4 - Sat, Sep 20
TAP AIR PORTUGAL Logo
7:00 am - 3:20 pmOPO-IAD
13h 20m1 stop
TAP AIR PORTUGAL Logo
5:00 pm - 10:10 amIAD-OPO
12h 10m1 stop
$476TAP AIR PORTUGAL
Find Deal
Thu, Sep 4 - Sat, Sep 20
Delta Logo
6:30 am - 3:35 pmOPO-IAD
14h 05m1 stop
Delta Logo
5:10 pm - 3:30 pmIAD-OPO
17h 20m2 stops
$489Delta
Find Deal
Wed, Oct 8 - Tue, Oct 21
American Airlines Logo
8:15 am - 3:00 pmOPO-IAD
11h 45m1 stop
American Airlines Logo
4:35 pm - 3:55 pmIAD-OPO
18h 20m1 stop
$493American Airlines
Find Deal
Wed, Oct 8 - Tue, Oct 21
Delta Logo
6:15 am - 11:29 pmOPO-DCA
22h 14m2 stops
Delta Logo
5:00 pm - 3:30 pmDCA-OPO
17h 30m2 stops
$494Delta
Find Deal
Wed, Oct 8 - Tue, Oct 21
Delta Logo
11:35 am - 10:19 pmOPO-DCA
15h 44m2 stops
Delta Logo
5:00 pm - 3:30 pmDCA-OPO
17h 30m2 stops
$495Delta
Find Deal
Thu, Sep 4 - Sat, Sep 20
Delta Logo
6:30 am - 7:43 pmOPO-IAD
18h 13m2 stops
Delta Logo
5:10 pm - 3:30 pmIAD-OPO
17h 20m2 stops
$495Delta
Find Deal
Wed, Oct 8 - Tue, Oct 21
American Airlines Logo
8:15 am - 3:00 pmOPO-IAD
11h 45m1 stop
American Airlines Logo
4:35 pm - 11:40 amIAD-OPO
14h 05m1 stop
$496American Airlines
Find Deal
Thu, Sep 4 - Sat, Sep 20
PLAY Logo
9:20 pm - 5:40 pmOPO-BWI
25h 20m1 stop
PLAY Logo
6:50 pm - 8:05 pmBWI-OPO
20h 15m1 stop
$509PLAY
Find Deal
Wed, Jul 30 - Wed, Aug 6
KLM Logo
9:20 am - 4:20 pmOPO-IAD
12h 00m1 stop
KLM Logo
5:25 pm - 10:15 pmIAD-OPO
23h 50m1 stop
$643KLM
Find Deal
Thu, Jul 3 - Thu, Jul 10
Lufthansa Logo
6:15 am - 7:25 pmOPO-IAD
18h 10m1 stop
Lufthansa Logo
10:20 pm - 11:20 pmIAD-OPO
20h 00m1 stop
$681Lufthansa
Find Deal
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KAYAK's insights & trends for Porto to Washington, D.C. flights

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

What’s the cheapest day of the week to fly from Porto to Washington, D.C.?

The average price of all round-trip flights from Porto to Washington, D.C. clicked on KAYAK for each day over the last 12 months.

For Porto to Washington, D.C., Monday is the cheapest day to fly on average and Wednesday is the most expensive. Flying from Washington, D.C. back to Porto, the best deals are generally found on Sunday, with Friday being the most expensive.

Good to know

Low seasonMay
High seasonOctober
Cheapest flight$294
Best time to beat the crowds with an average 21% drop in price.
Most popular time to fly and prices are also 13% lower on average.
Flight from Porto to Baltimore

When to book flights from Porto to Washington, D.C.

Are your dates flexible? Find out the best times to travel from Porto to Washington, D.C. 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 flights from Porto to Washington, D.C.

  • What is the cheapest flight from Porto to Washington, D.C.?

    In the last 3 days, the lowest price for a flight from Porto to Washington, D.C. was $294 for a one-way ticket and $476 for a round-trip.

  • Do I need a passport to fly between Porto and Washington, D.C.?

    Yes

  • Which airports will I be using when flying from Porto to Washington, D.C.?

    On your way to Washington, D.C., you’ll fly out from Porto. You’ll be landing in one of Washington, D.C.’s 2 airports: Washington, D.C. Reagan-National or Washington, D.C. Dulles Intl.

  • Which aircraft models fly most regularly from Porto to Washington, D.C.?

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

  • Which airline alliances offer flights from Porto to Washington, D.C.?

    oneworld, Star Alliance, and SkyTeam are the airline alliances operating flights between Porto and Washington, D.C., with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Porto to Washington, D.C., KLM or Lufthansa?

    The two airlines most popular with KAYAK users for flights from Porto to Washington, D.C. are KLM and Lufthansa. With an average price for the route of $632 and an overall rating of 7.8, KLM is the most popular choice. Lufthansa is also a great choice for the route, with an average price of $814 and an overall rating of 6.8.

  • How does KAYAK find such low prices on flights from Porto to Washington, D.C.?

    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 Porto to Washington, D.C..

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Porto to Washington, D.C.?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington, D.C. from Porto 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 Porto to Washington, D.C.?

    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 Washington, D.C. with an airline and back to Porto with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Porto to Washington, D.C.?

    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 Washington, D.C. from Porto up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top airlines flying from Porto to Washington, D.C.

 
See real verified KAYAK customer reviews for airlines flying from Porto to Washington, D.C.. 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 Porto to Washington, D.C.? 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.
7.8
KLMOverall score based on 1361 reviews
7.2Food
7.8Boarding
7.7Comfort
8.4Crew
7.1Entertainment
Airline reviews

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

8.0 ExcellentShereen, Apr 2025AMS - YUL
Read more KLM reviews

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

Legroom not all it could be, especially when the seat in front is reclined. Otherwise it was good, food and beverage were nice.

This portion of the flight was through Indigo. A local carrier. So all economy seating. No real service some refreshments for purchase standard economy stuff.

You should not have to pay for WiFi in business class

Transfer at Amsterdam airport is very convenient and the airport is easy to navigate. Boarding was also quick and easy. Cabin crew were excellent and the meals were good, although lacking in options.

Overall very positive. Boarding was quick and organized. Cabin was clean and seats were reasonably comfortable. Cabin crew was excellent and the meals provided were also of good quality

This fight left ahead of time which meant it arrived early which was great. Staff were very professional, but as with all these Short hop Flights the food was a disappointing snack There was no entertainment on this flight, but I did not expect any

I flew premium economy and this was a good option. Although the seats didn’t recline much, I was able to get some sleep with my head propped against the window. The food was good and the entertainment was wonderful The staff were very attentive and professional

Overall very poor. Flight was disorganised, staff were rude and this is my second experience with KLM that I've had baggage go missing. It feels like, if you are an economy customer, KLM staff do not show you any care. I shall never fly with KLM again. Worst airline in Europe

I was very grateful for Lufthansa's role in organizing mobility support. The touchscreen on my seat was faulty: slow, stained (I couldn't get it clean), and glitchy. This made selecting movies extremely time consuming, and twice I had to start all over from the beginning.

Beautifully maintained airplane, good food, professional crew, top-notch communication. I highly recommend Lufthansa for intercontinental flights between the United States and Europe.

Lufthansa is my favorite airline and have flown oversea with them for the past 25 years: i always found them so professional and incredibly efficient from checking in to arrival. I also love their Munich or Frankfurt airports.

The United flight was excellent! The flight attendants were attentive and nice, and the food was very good! And the glasses are larger than on Lufthansa flights! I don’t want to have to ask for 15 glasses of water because their glasses are ridiculously small!

The food not that great. Did not like the fact that we could not purchase upgrade at the airport

We paid for business class, and my seat did not work at all. Each time I wanted to adjust the position, an attendant had to come to physically force the seat into its new position. They tried to fix it by fiddling with the electronics (military reset, for example), to no avail. Also, the food was just mediocre. We were at the end of a serving section, so they ran out of several choices. (This was on the flight from Los Angeles to Munich.)

The crew was the best I’ve ever encountered. Business class was spacious, immaculate, and very modern.

The plane was very clean. The bathroom was clean as well. The land crew were very polite and informative and helpful. They informed me that there is a long way and challenging to go from international terminal to national terminal and in addition to getting my suitcases and going through customs and dropping them again for my second leg of trip which was San Francisco to Los Angeles . I have left knee issue and had a recent fall with aching muscles all over, the land crew suggested wheelchair help for me, God bless her. If I did not have help, I could not make it to my last terminal. Thank you UNITED AIRLINE!

I like the service and the efficiency. I am lactose intolerant and the lactose intolerant meal in business class was not astounding. Also, the business class fully reclining seats are not that comfortable.

Food was great but they didn't clear my meal tray for 3 hours. You'd think they could check though the cabin now and then.

Everything you need to know for your flight from Porto to Washington, D.C.

Information on your arrival and departure airports

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