$347 Find Cheap Flights from Porto to District of Columbia - Compare and Save

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 District of Columbia departing on 9/22. 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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Book Cheap Porto to District of Columbia Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Porto to District of Columbia 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 District of Columbia

Thu, Sep 3 - Wed, Sep 16
SWISS Logo
8:40 am - 4:45 pm
OPO
-
IAD
13h 05m
1 stop
SWISS Logo
8:20 pm - 6:30 pm
IAD
-
OPO
17h 10m
1 stop
$556SWISS
Thu, Sep 17 - Sat, Oct 3
Lufthansa Logo
11:05 am - 7:25 pm
OPO
-
IAD
13h 20m
1 stop
Lufthansa Logo
10:20 pm - 11:25 pm
IAD
-
OPO
20h 05m
1 stop
$568Lufthansa
Fri, Oct 30 - Wed, Nov 18
TAP AIR PORTUGAL Logo
6:00 pm - 4:15 pm
OPO
-
IAD
26h 15m
1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 1:30 pm
IAD
-
OPO
10h 00m
1 stop
$572TAP AIR PORTUGAL
Thu, Oct 1 - Tue, Oct 13
TAP AIR PORTUGAL Logo
9:00 am - 3:10 pm
OPO
-
IAD
11h 10m
1 stop
TAP AIR PORTUGAL Logo
5:05 pm - 9:00 am
IAD
-
OPO
10h 55m
1 stop
$575TAP AIR PORTUGAL
Thu, Sep 17 - Mon, Sep 28
TAP AIR PORTUGAL Logo
9:00 am - 8:35 pm
OPO
-
IAD
16h 35m
1 stop
TAP AIR PORTUGAL Logo
5:40 pm - 10:00 am
IAD
-
OPO
11h 20m
1 stop
$578TAP AIR PORTUGAL
Thu, Sep 17 - Wed, Sep 30
TAP AIR PORTUGAL Logo
11:00 am - 8:35 pm
OPO
-
IAD
14h 35m
1 stop
TAP AIR PORTUGAL Logo
10:35 pm - 5:00 pm
IAD
-
OPO
13h 25m
1 stop
$581TAP AIR PORTUGAL
Thu, Sep 17 - Wed, Sep 30
TAP AIR PORTUGAL Logo
7:00 am - 3:10 pm
OPO
-
IAD
13h 10m
1 stop
TAP AIR PORTUGAL Logo
10:35 pm - 8:25 pm
IAD
-
OPO
16h 50m
1 stop
$582TAP AIR PORTUGAL
Thu, Sep 17 - Wed, Sep 30
TAP AIR PORTUGAL Logo
7:00 am - 8:35 pm
OPO
-
IAD
18h 35m
1 stop
TAP AIR PORTUGAL Logo
10:35 pm - 11:10 pm
IAD
-
OPO
19h 35m
1 stop
$585TAP AIR PORTUGAL
Thu, Oct 1 - Tue, Oct 13
Multiple Airlines Logo
10:00 pm - 8:35 pm
OPO
-
IAD
27h 35m
2 stops
Multiple Airlines Logo
5:05 pm - 9:20 pm
IAD
-
OPO
23h 15m
2 stops
$595Multiple Airlines
Thu, Sep 17 - Wed, Sep 30
Multiple Airlines Logo
7:00 am - 8:35 pm
OPO
-
IAD
18h 35m
2 stops
Multiple Airlines Logo
10:35 pm - 11:50 pm
IAD
-
OPO
20h 15m
2 stops
$614Multiple Airlines
Booking Insights

KAYAK's insights & trends for Porto to District of Columbia flights

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

What is the cheapest month to fly from Porto to District of Columbia?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Porto to District of Columbia, 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 Porto to District of Columbia is March, when tickets cost $554 (return) on average. On the other hand, the most expensive months are January and September, when the average cost of round-trip tickets is $1,077 and $993 respectively.

Good to know

Low season

February

Cheapest flight

$347
Best time to beat the crowds with an average 24% drop in price.
Most popular time to fly with an average 1% increase in price.
Flight from Porto to Washington Dulles Airport

FAQs - booking District of Columbia flights

  • How does KAYAK find such low prices on flights from Porto to District of Columbia?

    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 District of Columbia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Porto to District of Columbia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Porto to District of Columbia 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 District of Columbia?

    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 Porto to District of Columbia 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 Porto to District of Columbia?

    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 Porto to District of Columbia 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 Porto to District of Columbia

 
See real verified KAYAK customer reviews for airlines flying from Porto to District of Columbia. 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 District of Columbia? 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.
7.2
TAP AIR PORTUGALOverall score based on 2352 reviews
6.3Food
7.0Boarding
7.1Comfort
7.8Crew
6.4Entertainment
Airline reviews

They left our luggage uncovered on tarmac in pouring rain during an hour delay of departure! At our final destination, we found ALL OF OUR CLOTHES/SHOES soaked all the way through!! Our 1st connection plane was a great business class accommodation but only 50 minutes long. Our 2nd connection from Lisbon (another delay with luggage uncovered on tarmac) had only the extra legroom and mediocre food in business class - no entertainment and no extra comfort seating. Will not use TAP Air Portugal again!

2.0 MediocreCharis, Apr 2026
OPO - LIS
Read more TAP AIR PORTUGAL reviews

They left our luggage uncovered on tarmac in pouring rain during an hour delay of departure! At our final destination, we found ALL OF OUR CLOTHES/SHOES soaked all the way through!! Our 1st connection plane was a great business class accommodation but only 50 minutes long. Our 2nd connection from Lisbon (another delay with luggage uncovered on tarmac) had only the extra legroom and mediocre food in business class - no entertainment and no extra comfort seating. Will not use TAP Air Portugal again!

The cabin crew were curt, not with me, but observed with other passengers. They were unduly rude and it was unprovoked and when they realized they were wrong, they made no attempt to apologize for their own confusion.

I was disappointed of the crew, not friendly and attentive. Delay one way for fuel leakage and the plane is so hot. Not that great all around but I’m glad I experienced it so now know better.

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.

Flight from FNC to OBO was cancelled. We were rebooked to Lisbon later in the day. It was inconvenient but it worked out ok in the end.

Flight delayed by >1 hour. Long boarding involving riding a shuttle to the plane.

TAP is a good, decent airline for international journeys. No complaints about the service, the crew, the comfort, or the baggage handling.

I like: The food provided was really good. I really enjoyed it Dislike: I couldn't open my window during the whole trip. Every time I wanted to do it, one of the crew came to me saying "please close it" It was a day flight. I wanted to have my window open and they didn't let me.

Everything you need to know for your flight from Porto to District of Columbia

Information on your arrival and departure airports