$300 Find Cheap Flights from Reagan Washington National Airport to Portugal

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 Portugal departing on 1/17. 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

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Cheap Flights from Reagan-National to Portugal

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Lisbon
Lisbon2 stops$634
Porto
Porto1 stop$445
Ponta Delgada
Ponta Delgada3 stops$705
Faro
Faro3 stops$748
Funchal
Funchal3 stops$722
Lisbon
Lisbon2 stops$634
Porto
Porto1 stop$445
Ponta Delgada
Ponta Delgada3 stops$705
Faro
Faro3 stops$748
Funchal
Funchal3 stops$722

Book Cheap Reagan-National to Portugal Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Reagan-National to Portugal 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 Portugal

Mon, Mar 9 - Tue, Mar 17
United Airlines Logo
8:10 pm - 9:30 amDCA-OPO
9h 20m1 stop
United Airlines Logo
12:35 pm - 9:35 pmOPO-DCA
13h 00m1 stop
$445United Airlines
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Mon, Mar 2 - Tue, Mar 10
Multiple Airlines Logo
11:05 am - 11:15 amDCA-OPO
19h 10m2 stops
Multiple Airlines Logo
6:00 am - 8:55 amOPO-DCA
30h 55m2 stops
$449Multiple Airlines
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Wed, Jan 14 - Wed, Jan 21
American Airlines Logo
12:10 pm - 7:40 amDCA-OPO
14h 30m2 stops
American Airlines Logo
8:20 am - 6:56 pmOPO-DCA
15h 36m2 stops
$451American Airlines
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Mon, Mar 2 - Tue, Mar 10
United Airlines Logo
4:10 pm - 9:30 amDCA-OPO
12h 20m1 stop
United Airlines Logo
6:00 am - 8:59 pmOPO-DCA
18h 59m2 stops
$459United Airlines
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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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Sun, Mar 8 - Wed, Mar 18
United Airlines Logo
6:00 pm - 9:30 amDCA-OPO
11h 30m1 stop
United Airlines Logo
12:35 pm - 9:35 pmOPO-DCA
13h 00m1 stop
$470United Airlines
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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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Fri, Jan 16 - Fri, Jan 23
TAP AIR PORTUGAL Logo
5:20 pm - 11:00 amDCA-TER
37h 40m2 stops
TAP AIR PORTUGAL Logo
11:50 am - 9:51 amTER-DCA
26h 01m2 stops
$1,135TAP AIR PORTUGAL
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Tue, Mar 3 - Sat, Mar 7
TAP AIR PORTUGAL Logo
2:05 pm - 11:00 amDCA-TER
16h 55m2 stops
TAP AIR PORTUGAL Logo
11:50 am - 7:01 amTER-DCA
23h 11m2 stops
$1,180TAP AIR PORTUGAL
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Booking Insights

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

Get data-powered insights and trends into flights from Reagan-National to Portugal 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. Reagan-National Airport to Portugal?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Reagan-National Airport to Portugal, 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. Reagan-National Airport to Portugal is November, when tickets cost $664 (return) on average. On the other hand, the most expensive months are June and August, when the average cost of round-trip tickets is $1,541 and $1,213 respectively.

Good to know

Low seasonJuly
Cheapest flight$295
Best time to beat the crowds with an average 2% drop in price.
Flight from Reagan Washington National Airport to Lisbon

FAQs - booking Portugal flights

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

    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 Portugal.

  • 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 Portugal?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Reagan Washington National Airport to Portugal 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 Portugal?

    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 from Reagan Washington National Airport to Portugal with an airline and back with another airline.

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

    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 from Reagan Washington National Airport to Portugal up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Portugal?

    The cheapest time of day to fly to Portugal is generally at night, when round-trip flights cost $1,008 on average. On average, there is no price difference when choosing to fly in the morning or the evening on this flight route. The most expensive time of day to fly to Portugal is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $1,302.

Reviews of the top airlines flying from Reagan-National to Portugal

 
Need help choosing which airline to fly with from Reagan-National to Portugal? 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 9062 reviews
6.6Food
7.1Entertainment
8.1Crew
7.7Boarding
7.3Comfort
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.

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

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

Wonderful just hope the had more direct flights to Boston

Boarding process was fast and efficient. Short flight but on time and well organized. I would certainly fly TAP again.

Very borderline, low budget airline without low budget prices There are no counts of soda, everything is dispensed enlarged bottles and poured into tiny cups about 70 mL so in order to keep hydrated you have to take 3-4 cups at a time. Also, there was only one food item offered, pasta, they ran out of chicken right away. Snack was very poor. It was called tuna sandwich, which is truly borderline. The flight attend attendance seemed to be overworked and tired.

TAP‘s flight attendants seem to be among the least ambitious of all the international flight crews we’ve flown with. . When we left US and went to Portugal, and when we returned from Portugal, flight attendants were not very visible. Then did not offer frequent water breaks and when we had to go back to request water, I was almost an imposition. Meal quality was just average. The dinners were fine. Breakfast wraps were presented soggy.

Did not enjoy the meal provided. The aircraft was dirty. For instance, the screen seemed to have been cleaned with a dirty rag. Disgusting.

The business class seats were smaller and closer together than other airlines.

Boarding- Good Seat Comfort - OK Crew - Good Food - Mediocre On Time - Very Good

Didn't like much. Wheelchair assistance was almost nonexistent. No one at TAP check in process helpful. On the plane, stewards were not friendly and disorganized. Food was terrible for 8 hr flight. We were skipped at snack time and even though we tried to get attention using overhead call system no one even looked up at us to acknowledge. Being at the back of first section and by the lavatory we only were able to request when they came to pick up everyone else's garbage and they were nonchalant...no apology or even choice. The 1/2 half bread with slice of cheese was a waste. Deplaning was horrible but I'll blame lisbon airport for that. Plane left late at made good time still arrived about 15 behind schedule and for using remote deplaning and bus to terminal took another 20 min to gate. Those with connections were highly stressed. Took us 2 hrs from landing to get to ground transportation and exit airport. And that was with wheelchair assistance.

Bad boarding, threat to force bag check mid journey, lines, late, buses, more waiting awful end to end.

Check in was excellent thanks to the team at the check in counter. I was disappointed to see that one has to pay for coffee on the flight. This is the first time I have seen that after 60 years of flying.

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

Information on your arrival and departure airports