$358 Find Cheap Flights from Porto to District of Columbia

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 3/24. 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 District of Columbia

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Porto to District of Columbia, 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 District of Columbia, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
Flight Deals

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

Fri, Jan 30 - Fri, Feb 6
TAP AIR PORTUGAL Logo
2:20 pm - 9:00 pm
OPO
-
IAD
11h 40m1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 5:00 pm
IAD
-
OPO
13h 30m1 stop
$506TAP AIR PORTUGAL
Thu, Jan 15 - Wed, Jan 28
TAP AIR PORTUGAL Logo
7:00 am - 3:15 pm
OPO
-
IAD
13h 15m1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 5:00 pm
IAD
-
OPO
13h 30m1 stop
$508TAP AIR PORTUGAL
Thu, Jan 15 - Wed, Jan 28
Air Canada Logo
6:00 am - 8:55 am
OPO
-
DCA
31h 55m2 stops
Air Canada Logo
4:15 pm - 1:15 pm
DCA
-
OPO
16h 00m2 stops
$596Air Canada
Thu, Jan 15 - Wed, Jan 28
Multiple Airlines Logo
6:00 am - 3:46 pm
OPO
-
IAD
38h 46m2 stops
Multiple Airlines Logo
9:45 am - 11:15 am
IAD
-
OPO
20h 30m2 stops
$596Multiple Airlines
Thu, Mar 5 - Mon, Mar 9
United Airlines Logo
6:00 am - 8:55 am
OPO
-
DCA
31h 55m2 stops
United Airlines Logo
8:10 pm - 9:30 am
DCA
-
OPO
9h 20m1 stop
$597United Airlines
Mon, Jan 12 - Mon, Jan 19
KLM Logo
11:15 am - 4:05 pm
OPO
-
IAD
33h 50m1 stop
KLM Logo
6:50 pm - 10:30 am
IAD
-
OPO
10h 40m1 stop
$599KLM
Thu, Mar 5 - Mon, Mar 9
Air Canada Logo
6:00 am - 7:45 pm
OPO
-
DCA
42h 45m2 stops
Air Canada Logo
11:05 am - 12:50 pm
DCA
-
OPO
21h 45m2 stops
$604Air Canada
Fri, Jan 23 - Sun, Jan 25
United Airlines Logo
12:30 pm - 3:50 pm
OPO
-
IAD
32h 20m1 stop
United Airlines Logo
5:15 pm - 11:40 am
IAD
-
OPO
13h 25m1 stop
$616United Airlines
Mon, Jan 12 - Mon, Jan 19
KLM Logo
6:30 am - 7:09 pm
OPO
-
IAD
17h 39m2 stops
KLM Logo
7:30 pm - 3:25 pm
IAD
-
OPO
14h 55m2 stops
$678KLM
Thu, Jan 15 - Wed, Jan 28
Multiple Airlines Logo
6:35 am - 9:56 pm
OPO
-
DCA
20h 21m2 stops
Multiple Airlines Logo
11:05 am - 6:00 pm
DCA
-
OPO
25h 55m3 stops
$724Multiple 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’s the cheapest day of the week to fly from Porto to District of Columbia?

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

If you are looking for a flight deal from Porto to District of Columbia, look for departures on Mondays and avoid leaving on a Wednesday, as it's usually the priciest day. When flying back from District of Columbia, Sunday is the cheapest day to fly and Friday is the most expensive.

Good to know

Low seasonMay
Cheapest flight$358
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly and prices are also 4% lower on average.
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.

  • What is the cheapest time of day to fly to District of Columbia?

    The cheapest time of day to fly to District of Columbia is generally in the morning, when round-trip flights cost $735 on average. Morning departures are around 31% cheaper than evening flights, on average. The most expensive time of day to fly to District of Columbia is generally in the evening, which is peak travel time and where the average cost of a ticket is $1,068.

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 2091 reviews
6.2Food
6.3Entertainment
7.1Comfort
7.0Boarding
7.8Crew
Airline reviews

Flew Business class and did not like anything, flight attendants were rude and not helpful. Food was of poor quality and I did not eat meals.

2.0 MediocreAnonymous, Dec 2025
LIS - LAX
Read more TAP AIR PORTUGAL reviews

Flew Business class and did not like anything, flight attendants were rude and not helpful. Food was of poor quality and I did not eat meals.

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 long line at the gate, moved slowly. I had expected that boarding a flagship A330neo would be with a jetway directly at the gate, and not a long bus ride to the airplane.

The layover was only one hour and a huge line for passport control. If I didn’t cut the line and argue was every single official, I would’ve spent the night in this one. Obviously.TAP AIR people. do not take into account.this problem with their flight scheduling, which is extremely frustrating. Poor food choices, on the pasta was offered, they ran out of chicken right away. All the sodas and water poured in a tiny 70 mL cups, which is not enough to keep hydrated on the long flight. I had to ask for 34 cups at a time. Flight attendant seemed to be tired and overworked.

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.

I am not very tall, and had a difficult time getting my carry-on placed in the overhead bin while passengers were behind me waiting to get to their seats. After struggling with the luggage, I turned it around, and left it, knowing it was not properly placed, but believing there was adequate room for it in the bin. When the flight attendant came through the cabin, she asked whose bag it was, and scolded me for not positioning it correctly. She turned it around and moved on. I thought that her approach was totally unprofessional, calling out a passenger in that manner.

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.

There was no warning that they have added passport control after check in, the line was enormous and after 46 mins wait we missed our flight. Were forced to leave the airport and purchase new tickets at full price to board a later flight. TAP were unsympathetic and unhelpful.

Boarding we were jammed into a hot crowded bus waiting too long while another bus went in front of us. Appreciated blanket and pillow, movie available helped time pass, the food was not appealing so I had my own snacks, the flight is long, but nothing they can do about that. Staff adequate, flight good.

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

Information on your arrival and departure airports