WAS - OPO

$259 Find Cheap Flights from Washington, D.C. 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 Washington, D.C. to Porto departing on 8/3. 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

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These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. 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.
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Cheap Flights from Washington, D.C. to Porto (WAS-OPO)

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

Thu, Sep 4 - Mon, Sep 8
 Logo
10:20 pm - 10:05 pmIAD-OPO
18h 45m2 stops
 Logo
9:20 am - 8:50 pmOPO-IAD
16h 30m2 stops
Mon, Oct 6 - Mon, Oct 20
TAP AIR PORTUGAL Logo
5:45 pm - 8:25 pmIAD-OPO
21h 40m1 stop
TAP AIR PORTUGAL Logo
7:00 am - 8:50 pmOPO-IAD
18h 50m1 stop
$501TAP AIR PORTUGAL
Find Deal
Wed, Nov 19 - Wed, Nov 26
United Airlines Logo
10:56 am - 11:40 amBWI-OPO
19h 44m2 stops
United Airlines Logo
6:00 am - 9:59 amOPO-BWI
32h 59m2 stops
$515United Airlines
Find Deal
Wed, Nov 12 - Sun, Nov 16
Lufthansa Logo
11:10 pm - 11:45 pmIAD-OPO
19h 35m1 stop
Lufthansa Logo
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
$546Lufthansa
Find Deal
Sun, Oct 26 - Sun, Nov 2
United Airlines Logo
6:30 am - 3:15 pmIAD-OPO
28h 45m2 stops
United Airlines Logo
5:00 am - 9:20 pmOPO-IAD
44h 20m2 stops
$561United Airlines
Find Deal
Thu, Nov 13 - Sun, Nov 16
Lufthansa Logo
11:10 pm - 11:45 pmIAD-OPO
19h 35m1 stop
Lufthansa Logo
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
$596Lufthansa
Find Deal
Tue, Oct 14 - Thu, Oct 23
Delta Logo
5:30 pm - 3:30 pmBWI-OPO
17h 00m2 stops
Delta Logo
11:35 am - 12:12 amOPO-BWI
17h 37m2 stops
$625Delta
Find Deal
Wed, Oct 22 - Fri, Oct 31
Delta Logo
1:00 pm - 10:40 amBWI-OPO
16h 40m2 stops
Delta Logo
5:00 am - 6:47 pmOPO-BWI
17h 47m2 stops
$651Delta
Find Deal
Tue, Jul 15 - Tue, Jul 22
KLM Logo
6:30 pm - 3:30 pmIAD-OPO
16h 00m1 stop
KLM Logo
6:35 am - 4:20 pmOPO-IAD
14h 45m1 stop
$687KLM
Find Deal
Fri, Jul 11 - Fri, Jul 18
KLM Logo
7:18 pm - 3:35 pmBWI-OPO
15h 17m2 stops
KLM Logo
9:20 am - 10:48 pmOPO-BWI
18h 28m2 stops
$842KLM
Find Deal
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KAYAK's insights & trends for Washington, D.C. to Porto flights

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

What is the cheapest month to fly from Washington, D.C. to Porto?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. to Porto, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Washington, D.C. to Porto is November, where tickets cost $484 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $879 and $852 respectively.

Good to know

Low seasonJanuary
High seasonJuly
Cheapest flight$259
Best time to beat the crowds with an average 16% drop in price.
Most popular time to fly with an average 23% increase in price.
Flight from Washington Dulles Airport to Porto

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

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

  • Which other nearby cities are served by Porto Airport (OPO)?

    Porto Airport (OPO) is the main international airport serving the city of Porto. You can explore several nearby cities within an hour's drive from OPO. The nearby cities are Braga, Guimaraes, and Aveiro. You can get to these cities using either buses, taxis, or car rentals from the airport (OPO). Car rentals, however, provide a more flexible means of transport from the airport to these cities.

  • Which airlines offer family services on trips between Washington and Porto?

    United Airlines, TAP Air Portugal, American Airlines, and Delta Airlines are family-friendly due to their spacious seating options, including extra legroom and seating arrangements designed for families. Furthermore, they feature kid-friendly menus, including meals and snacks, and in-flight entertainment to keep the kids engaged until their arrival in Porto.

  • Which eco-friendly practices do airlines use when flying from Washington and Porto?

    The average carbon emission per passenger on the Washington to Porto route is approximately 6865 lb. However, you can fly sustainably with TAP Air Portugal. The airline operates flights that produce 43% less carbon dioxide per passenger on this route. TAP Air Portugal is committed to blending SAFs into their jet fuel supply, which helps to significantly reduce greenhouse gas emissions associated with their flights. They have also implemented recycling programs on board their flights, encouraging passengers to separate and dispose of recyclable waste appropriately.

  • Can I rent a car at Porto Airport (OPO)?

    Yes, you can rent a car at OPO. OPO has a variety of car rental providers onsite, including Avis, Budget, Europcar, Hertz, Sixt, and Thrifty. Upon arrival at the airport, you will find the car rental providers' desks conveniently located in the arrivals area. These providers offer a wide selection of vehicles, including economy cars, sedans, and SUVs.

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

    In the last 3 days, the lowest price for a flight from Washington, D.C. to Porto was $259 for a one-way ticket and $500 for a round-trip.

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

    Yes

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

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

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

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

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

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

  • What is the most popular layover when flying to Porto from Washington, D.C.?

    Lisbon is the most popular layover city among KAYAK users traveling from Washington, D.C. to Porto.

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

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to Porto are Delta and KLM. With an average price for the route of $620 and an overall rating of 8.0, Delta is the most popular choice. KLM is also a great choice for the route, with an average price of $658 and an overall rating of 7.8.

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

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

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

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington, D.C. 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 Washington, D.C. up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Washington, D.C. to Porto

  • Dulles International Airport (IAD) is the hub for United Airlines, and if you are traveling with this airline from Washington, D.C., to Porto, you will depart from Terminal D. United Airlines operates most international flights from Terminal D while operating domestic flights from Terminal C.
  • Parents of Unaccompanied Minors flying from Washington (DCA) to Porto should consider booking them on American Airlines. Unaccompanied Minors between the ages of 5 and 14 years old are accepted by American Airlines at DCA. The minors receive a wristband at check-in with their flight information, and a customer service representative monitors them while accompanying them to the gate.
  • If you intend to take the Metro subway to the airport, you can get to either Reagan-National (DCA), which is connected to the Metro's Blue and Yellow Lines, or Dulles International (IAD), which is connected to the Metro's Silver Line.
  • If you’d like to upgrade your TAP Air Portugal Economy seat when flying from Washington to Porto, consider upgrading your Economy ticket to either EconomyXtra or Executive Cabin for a fee. EconomyXtra and Executive cabins provide passengers with additional legroom, wider seats, an additional baggage allowance, and enhanced in-flight services.
  • When departing from IAD, at least one VIP lounge is in each concourse. Concourse A has Air France-KLM, Etihad, and Virgin Atlantic lounges. Concourse B houses the British Airways lounge, the Lufthansa lounge, and Turkish Airlines amenities. In Concourse C, there are three United Club lounges, one United Polaris lounge, and one United Club lounge in Concourse D.

Top 5 airlines serving from Washington, D.C. 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 Washington, D.C. 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.
8.0
DeltaOverall score based on 7950 reviews
8.2Boarding
7.9Comfort
7.3Food
7.9Entertainment
8.5Crew
Airline reviews

Great overall. There was a bit of turbulence so they could only serve water because too much turbulence for the carts. Was glad they prioritized safety though

10.0 ExcellentTim, Jun 2025MSP - BUF
Read more Delta reviews

Great overall. There was a bit of turbulence so they could only serve water because too much turbulence for the carts. Was glad they prioritized safety though

Excellent flight, the planes were newer, they did a nice job with boarding, great service overall.

Flight was delayed long enough that I was misding my connecting flight. The agents could not get me on a comparable flight, nor could they get me s Main Cabin seat I had paid for, nor could they get me on a comparable connecting flight. The gate agent would not issue meal vouchers, even though I was delayed over six hours! I had to spend over an hour and 15 minutes with customer service on the phone to See if they could get me on a better flight and get a meal voucher. Customer service was not helpful enough in trying to find alternate flights and it Ended up taking me 24 hours for a 12 hour trip!! Delta does not provide upgrades NOR will they even give you a pass for a few hours to their lounge. They claim that they do not issue daily passes to their lounge anymore. I call BS since this would be no extra cost to them to provide excellent customer service and give you a few hours to relax in comfort when you’re sitting in a crowded airport and your flight has been screwed up for that many hours.

Great service. Flight was delayed while we sat on the runway for a couple of hours. Weather related. Staff made is very bearable. The steward servicing the first class cabin was exceptional. Thank you! 💗

5 hours of delay that could've been much shorter if Delta had taken the 1 hour delay they imposed on the flight before boarding to run any of the plane checks required for flight to find the hydraulic issue that required nearly 3 hours to fix. $24 of meal credit buys a sandwich and a soft drink. Poor communication within the terminal about what gate we'd be re-boarding from and when we'd be re-boarding.

Great flight! Only complaint I had was that I didn’t get breakfast that morning because I don’t eat eggs for breakfast.. I ate an energy bar I bought in the airport which I had never done before. Otherwise, another great Delta flight!

Amazing flight! I have never noticed the uniforms of the attendants before in twenty years of flying except today when one female had the most amazing dress on. It was beautifully designed and showed she was in charge. I never dreamed I would google who designed Delta uniforms . The ultimate compliment is when another woman admires your outfit. . I hope your designer puts it on the market

It would be nice if was given wires ear buds. Overall was a good experience was able to sleep on the plane

My flight was 6 pm 6/6. Every hour they delayed it again - air condition issues then no pilot then the crew had worked too many hours and cancelled the flight at 11 pm. Sent customers to NJ a 45 minutes uber ride to a hotel. Had to be back by 5 am for a 7 am flight and again no pilot etc with another three hours of delays.

The entertainment and wifi mostly didn't work on this flight.

Klm start boarding while somw air issue in the plan

The service was great. However the lounge only gets passing grade

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

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

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

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

It was fine, definitely older planes with no charging or anything. There’s no entertainment set up on board, but it is nice that they allow you to access the in flight entertainment from your phone without having to pay for the Wi-Fi and they do offer free texting.

Terrible. Out flight was delayed for 21 (twenty one) hours. United is a joke.

Boarding was mayhem. Late boarding by 15 minutes because of lack of staff (missing 1 flight attendant. We had to wait for an arrival of another plane before we could board). Flight was a little rough, but cannot blame on airlines.

Impressed with the service despite turbulence because of the weather. Both flights arrived before their scheduled times.

I fly UAL 7-8 times per year. This flight was not up to snuff because it boarded very late "due to unexpected delays in restocking the plane" and yet Flight Aware showed the plane had landed some 10 hours earlier--so I think they could have planned accordingly. The FA's were nice but harried. The video system had to be rebooted 3-4 times. The food service was rather abrupt; they forgot my row and when I asked for my meal, they brought it with some impatience. Overall, the flight was fine, but the little details made it feel somewhat mundane and hurried.

I didn’t get on plane. Passport being processed by consulate with visa application. Tried to cancel through underpricer after purchasing cacelling for any reason. No dice, they are thieves.

When I booked it on Kayak it aaid that I wasn't allowed hamd luggage. I called United Airlines and it took them 6 minutes to figure out if I was allowed free hand luggage. Surely something that simple they should be able to tell me instantly.

We were delayed in Toronto on the tarmac for THREE hours with no clear indication as to why except that it was not a safety hazard. Pilot did apologize more than once but even he was unable to explain why exactly we were delayed. I overheard the stewards saying that the captain was very frustrated with the situation as well because he was not able to explain why except it had something to do with water supply or system on the aircraft and now we needed to wait for an engineer to approve the aircraft for flight. It was very frustrating and distressing as a passenger and we should have been given complimentary meals at the very least.

Flight was cramped with every seat taken. The food was fine, nothing crazy to write home about. The plane felt dated and needing some TLC, the button for the window shade didn't work and there were no AC outlets to use. When communicating with staff all except one nice lady never seemed happy to help me almost like I was bothering them when asked for things like a glass of water or a snack. The flight was overall fine. It did what was needed which is get me from point A to point B. But it certainly was not special. I don't expect much in economy but I believe economy on a host of other airlines is more memorable and better experience.

I’ve never had worse food in business class ever!

Checked bG chstgr was extremely high. Over $120. It was s bsit and switch knowing an international passenger would have t9 check a bag.

First, communication was terrible. The gate on our ticket was not what was reflected on the airport screens and TAP personnel were not present at either gate to answer questions. The flight was delayed and there was no announcement. Also, there was an equipment swap to a smaller airframe which affected our level of comfort. The root of all these issues was as a lack of communication. With air travel in foreign countries already being a stressful affair, lack of communication needlessly raises the level of difficulty.

Checkin was very slow, we had checked in online and hoping we could do a bag drop at the airport. However everyone with checked bags had to queue up and it took over 40mins. Our advice arrive extra early or you will be rushing to the gate.

On time, politeness, food okay but entertneiment mediocre with only old movie and the so called new we’re 2 or 3…

Do you have a bad service And And treat customers terrible

Awful. I told them to cancel my return flight and they didn’t then charged me +$800 days before the flight for a biz class upgrade bid. When I called to confirm cancellation and get refund on buz class upgrade they said I had to go thru orbitz and it was too late. Scammers. Beware.

Little leg room in business. I am tall and could use more.

Was a cheap flight and it got me to Portugal on time. For economy there was ample leg room and the flight attendants were pleasant and helpful.

Flight was packed. This was a very uncomfortable experience. Boarding process could be explained better. Despite recommending a window seat when travelling with a pet in the cabin, the seat in front of me had less space than the center and aisle seats. For Premium Economy, the seats were crammed with minimal legroom. I hate to think what Regular Economy was like. The cabin crew missed me at first when handing out meals. When my meal eventually came, there were no utensils. I'd originally booked to fly Business Class; those seats didn't look that great either.

Flight was 1.5 hours late to depart so changed flights to Swiss Air.

The United Airlines crew that operated this flight was subpar. They didn’t

Very small and uncomfortable seats, Hard to hear entertainment system sound. Horrible food. Staff doesn't care much about the passengers. 2nd time they didn't give me my vegetarian meal. They asked me regular food with meat. The airline and staff was from United airlines.

Checkin took along timen only.few angents available at.checkin desk. Customer support over phone no existence

At baggage claim, I was given the wrong printed ticket. The ticket belonged to another passenger for a different flight — to Zurich instead of Frankfurt (layover). I was even allowed to pass security, and when I asked the Lufthansa employee if I was on the correct flight, and why it was changed. The employee said everything was correct and I should board. When I got on the plane, there was someone in my seat, and the crew on the plane finally realized that I was on the wrong plane. When I got off the plane, nobody was willing to help, and the security refused to provide my original printed ticket. That was until I showed them that I took a photo of the ticket; once they realized I had photographic evidence, they were suddenly ready to help me. The Lufthansa employee began communicating with other airlines and found a flight that would take me to my destination via Polish Airlines. I was required to once again go through security, re-check my bag, and once again pay for my checked bag and weight overage fees. This experience was incredibly stressful and very frustrating, as you can imagine. A Lufthansa employee told me I would be eligible for a refund. Please tell me what steps I need to take in order to make that happen. Thank you!

The row of seats were so cramped it was difficult to get in and out of your seat. I even upgraded. A long flight and sad accommodations 😵‍💫 the shorter flight was very comfortable and the seating was spacious

I bought a ticket and paid for for our luggage but I had to pay for my luggage again. I’m so disappointed! We had a 30 min delay and because of that we missed our connecting flight and were told that we would be on the next flight (9am flight ) but we were landed we were booked at 12pm flight. I had a little baby w me, it was very stressful. I begged to leave at 10 am at least. I was emailed that we get a voucher but they didn’t work when we were at a breakfast store. I’ve been always happy w Lufthansa but this time was awful.

Good service … bus transfer upon arrival from plane to terminal: atrocious!!!

helpful and friendly. The Lufthanza people I dealt with before my holiday were so unhelpful by comparison.

We had a 1 1/2 hour delay before we left Denver. When we arrive to Frankfort, they didn’t announce that people with connecting flights to exit the plane first. My next flight was already boarding when we we taxiing in to the gate. I waited another 10 minutes to get off the plane. I had to run to catch my next flight. I mean run! I made it with one minute to spare, but my luggage did not. My luggage came two hours later on a different flight.

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

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