ATL - OPO

$340 Find Cheap Flights from Atlanta 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 Atlanta to Porto departing on 11/20. 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 Atlanta to Porto.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Atlanta to Porto.
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Flight Deals

Cheap Flights from Atlanta to Porto (ATL-OPO)

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

Thu, Nov 27 - Fri, Dec 5
Scandinavian Airlines Logo
8:00 pm - 4:55 pmATL-OPO
15h 55m1 stop
Scandinavian Airlines Logo
5:35 pm - 5:25 pmOPO-ATL
28h 50m1 stop
$488Scandinavian Airlines
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Thu, Oct 30 - Fri, Nov 14
Scandinavian Airlines Logo
9:00 pm - 4:55 pmATL-OPO
15h 55m1 stop
Scandinavian Airlines Logo
5:35 pm - 5:25 pmOPO-ATL
28h 50m1 stop
$491Scandinavian Airlines
Find Deal
Mon, Nov 3 - Thu, Feb 12
United Airlines Logo
4:32 pm - 9:30 amATL-OPO
11h 58m1 stop
United Airlines Logo
6:00 am - 11:43 amOPO-ATL
34h 43m2 stops
$536United Airlines
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Wed, Nov 26 - Wed, Dec 3
United Airlines Logo
4:32 pm - 9:30 amATL-OPO
11h 58m1 stop
United Airlines Logo
6:00 am - 7:51 pmOPO-ATL
18h 51m2 stops
$540United Airlines
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Tue, Nov 4 - Tue, Feb 10
United Airlines Logo
10:10 am - 9:30 amATL-OPO
18h 20m2 stops
United Airlines Logo
6:00 am - 11:43 amOPO-ATL
34h 43m2 stops
$541United Airlines
Find Deal
Mon, Nov 3 - Tue, Feb 24
United Airlines Logo
4:32 pm - 9:30 amATL-OPO
11h 58m1 stop
United Airlines Logo
12:35 pm - 8:05 pmOPO-ATL
12h 30m1 stop
$543United Airlines
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Wed, Nov 5 - Tue, Feb 24
Delta Logo
10:45 pm - 10:25 amATL-OPO
30h 40m1 stop
Delta Logo
11:10 am - 7:45 pmOPO-ATL
13h 35m1 stop
$564Delta
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Mon, Nov 3 - Tue, Feb 24
Delta Logo
3:50 pm - 10:15 amATL-OPO
13h 25m1 stop
Delta Logo
11:10 am - 11:42 pmOPO-ATL
17h 32m2 stops
$573Delta
Find Deal
Mon, Nov 3 - Mon, Feb 9
Air France Logo
5:10 pm - 10:30 amATL-OPO
12h 20m1 stop
Air France Logo
11:25 am - 1:05 pmOPO-ATL
30h 40m1 stop
$575Air France
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Thu, Nov 13 - Tue, Nov 18
KLM Logo
5:10 pm - 10:25 amATL-OPO
12h 15m1 stop
KLM Logo
11:10 am - 7:35 pmOPO-ATL
13h 25m1 stop
$612KLM
Find Deal

Everything you should know

Top airlines
Scandinavian Airlines
Cheapest • from $488 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
2 weeks
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 60% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
February
Cheapest • 32% price drop
October
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$488
Overall average: $852
Scandinavian Airlines
Thu 11/27Fri 12/5
ATL - OPO • 1 stop
Cheapest one-way
$340
Typical prices: $514-543
Multiple Airlines
Thu 11/20
ATL - OPO • 1 stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Porto!
Booking Insights

KAYAK's insights & trends for Atlanta to Porto flights

Get data-powered insights and trends into flights from Atlanta to Porto 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 Atlanta to Porto?

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

If you are looking for a flight deal from Atlanta to Porto, look for departures on Tuesdays and avoid leaving on a Saturday, as it's usually the priciest day. When flying back from Porto, Thursday is the cheapest day to fly and Saturday is the most expensive.

What is the cheapest month to fly from Atlanta to Porto?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Atlanta 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 Atlanta to Porto is February, where tickets cost $634 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $1,272 and $1,206 respectively.

How far in advance should I book a flight from Atlanta to Porto?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Atlanta to Porto, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Atlanta to Porto, you should book around 2 weeks before departure, which saves you about 60% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 22 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$340
Best time to beat the crowds with an average 24% drop in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from Atlanta to Porto

When to book flights from Atlanta to Porto

Are your dates flexible? Find out the best times to travel from Atlanta 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 Atlanta to Porto

  • What is the cheapest flight from Atlanta to Porto?

    In the last 3 days, the lowest price for a flight from Atlanta to Porto was $340 for a one-way ticket and $488 for a round-trip.

  • Do I need a passport to fly between Atlanta and Porto?

    Yes, you’ll need a passport to travel to Porto from Atlanta.

  • Which aircraft models fly most regularly from Atlanta to Porto?

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

  • Which airline alliances offer flights from Atlanta to Porto?

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

  • Which is the best airline for flights from Atlanta to Porto, Delta or KLM?

    The two airlines most popular with KAYAK users for flights from Atlanta to Porto are Delta and KLM. With an average price for the route of $1,025 and an overall rating of 7.9, Delta is the most popular choice. KLM is also a great choice for the route, with an average price of $996 and an overall rating of 7.8.

  • How does KAYAK find such low prices on flights from Atlanta 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 Atlanta to Porto.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto from Atlanta 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 Atlanta 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 Atlanta with another airline. Booking your flights between Atlanta and OPO can sometimes prove cheaper using this method.

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

Reviews of the top 5 airlines serving from Atlanta to Porto

 
See real verified KAYAK customer reviews for airlines flying from Atlanta 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 Atlanta 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.
7.9
DeltaOverall score based on 7957 reviews
7.9Comfort
7.9Entertainment
7.3Food
8.5Crew
8.2Boarding
Airline reviews

The food was terrible especially for a 15 hour international flight. The crew was unpleasant as well.

8.0 ExcellentOlaf, Sep 2025ATL - CPT
Read more Delta reviews

The food was terrible especially for a 15 hour international flight. The crew was unpleasant as well.

Crew was good. The reservation got mixed up and they didn't have my TSA number. I am also a Silver Medallion and wasn't able to use Sky Priority.

Delayed due to thunderstorms and no in-flight service due to rough weather — both of which are out of Delta’s control. Flight was good overall.

There was supposed to be a meal served, but there wasn’t and the major toilet was out of order

Always good but we must do something about people in rows ahead of you that don't put their seats back up when they are suppose to. And It's rough to not be able to even lean over to get something out of my purse.

Did not know my son and I had different seating arrangements. He was fine, but it was disappointing.

I'm a tall guy and even the seats with more leg room were not as comfortable as I had hoped.

It was an overnight flight and I desperately needed coffee before we landed, but Delta does only one beverage service, and that is shortly after takeoff, not before landing at 5 am.

Overall, it was okay. Seat was a little cramped. Would’ve liked more substantial snacks or opportunity to buy some.

I was with one of the last zones to board. It was kind of annoying to finally get called to board and my whole section was already on the plane. Clearly they boarded with previous zones. So by the time I got on board, there were no spaces for my luggage above my head. I had to put my luggage 4+ rows behind me, which meant that I had to wait even longer to get off the plane, since I had to wait for those rows to clear the aisle before I could retrieve my luggage and exit the plane. This also held up the plane cleaners, as they couldn't service my row until I cleared it, so they were all standing there waiting for me, while I'm standing there waiting for the other passengers to clear the aisle. Anyways, I wasn't in a rush this time, so I just waited, but I could see that being a problem in the future. Now, I could have checked my luggage, of course, but coincidentally, a friend of mine on the same flight got their luggage damaged (wheel completely knocked off) and was told by the Baggage Attendant in the airport that Delta doesn't "cover wheel damage" on luggage. This was disappointing to hear. I'm glad I didn't check mine through. If it were my luggage, I'd be highly frustrated to hear that. It makes me not want to check my luggage in the future.

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

First of all we couldn’t check in online, then we learn at the airport we were on stand by for KLM’s mistake of overbooking. The seats were not comfy at all. Our luggage got lost.

Ad experience - been flying many years with them but they are losing out to other carriers with their service and bagage / seating policy. My 2 12-yo kids were not placed with the parent. Absurdity.

KLM remains a quality flag carrier airline which maintains its standards whilst all their competitors are lowering theirs.

My flight was delayed by 6 hours then I missed BOTH of my connecting flights, I then had to stay in the AIRPORT at JFK because soooooo many people also suffered from missing flights and there was no hotels available. I would like to be compensated for this experience! I had to stay in the airport for over 16 hours!

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.

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.

I bought business class tickets but the seats are exactly like economy with no comfort seats nor an empty seat next to me provided. Very poor, low quality airline.

I don't understand the concept of paying to get your personal luggage onboard and then asked to check it in.... either sell the space or don't, its a hassle to carry those all through the airport just to make a check in at the last minute.

The food was great and the service and attitude was amazing!!

It was a great experience. The only thing I would have changed was that the bathrooms were never cleaned and they got very dirty.

Old airplanes small seats expensive tickets, not as expected overall and not comfortable according to the price

It was an OK flight with below mediocre service by their flight attendants

Wasted a lot of time trying to find the CDG lounge - it was not next to the connecting flight gate like the Air France staff said.

My experience was good overall, the quality of the food really decreased! There used to be a choice between meat and fish now it’s between chicken and pasta! In the choices of entertainment meditation has been added which is very good. Soft chair workout to improve blood circulation and avoid phlebitis should be added.

The only reason the overall rating wasn't "excellent" was due to problems in claiming luggage. The bags are delivered to the main area (Cinta 35) for domestic passengers, but to a DIFFERENT ROOM for international arrivees. After waiting 30 minutes, someone (who didn't appear to be from Air France or the airport) told us to go to another area. There we found our bags, which appeared to have been awaiting us for a while. We had to go through a bag check before leaving the airport. If we had been alerted to this possibility, or better yet, been to go directly to Cinta 34, we could have eliminated quite a bit of waiting.

Much better than the major US Carriers especially in Biz Class.

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

Everything was good, except the seats in economy were so close together, you could barely get out when the seat in front of your was reclined. If the airlines keep jamming in more and more seats, it will become intolerable. I will look for another airline that considers customer comfort and does not keep adding more rows of seats for more profit.

The newer screen was super cool and had the option to watch many different shows or movies. Crew was polite and helpful. However again, many children screaming bloody murder and kicking my seat, and parents doing nothing about it as usual.

Flight was good and crew was super polite. However, there were around 5 kids screaming the WHOLE 2 hours. I understand kids have to come but parents need to do something to control their children. They make the experience terrible, especially after finishing 16 hour shifts at the hospital I needed some sleep, which I did not get.

IAD with the archaic people movers is just a place to be avoided.

Great service on board. Boarding a bit slow due to process. Food was pretty average.

Tastless food and too obvious lack of enthusiasm for service in the economy vesus business class

All of the United employees I interacted with were professional and courteous. The aircraft was clean, the food on the flight was good. No complaints here.

I had no checked baggage but was required to hand over carry on baggage at the door of the plane. There was a lot of overboard space in the plane and I was one of the last ones. I ran to get my carry on but it was gone. I was given back at the plane door in Toronto, so the wait was not as long as it would have been at the carousel.

Armrest controller on my seat 35D and nextbooennseat 35E did not work right. Hard to press buttons to recognize and 35D had constantnpressure either upmost down somit was nearly impossible to make selections. .

Rude staff. I would avoid using the word racist but definitely partially or discriminatory. My 72 yrs old mother who is also disabled was traveling on this flight. She was the second passenger boarded to the plane. The First elderly couple ahead of my mother were allowed to use the airplane bathroom but my mother was denied entry stating it was for safety reasons. My mother objected the the couple in front of her were allowed but hostess still stated that due to the flight safety reasons she can’t use it. Even my mother explained that he is using blood pressure medication that’s why she have to use the restroom frequently but the crew continued arguing her. At one point the Mae attendent even suggested that if that’s the case my mother can urinate in her seat. The level of disrespect against an elderly lady is beyond my comprehension. This matter will be taken to the social media to shame the employees involved.

my experience was great with Turkish airlines . the problem i encountered was with kayak booking. When I booked . it showed that im allowed a bag . and when I got to the airport, i had to pay $165 for one bag.

Not up to Business Class standards. Two of the three toilets were out of order. The hostesses were aware and didn’t show any responsible act to do something. Food quality was not what we expect from Turkish hospitality. Overall we were not impressed and disappointed.

During mid flight, try to get a flight attendant to help I couldn’t find one Otherwise, everything was perfect

I was not given basinett seat.The connecting flight was missed due to airline fault i was not accomodated for hotel.Drinks were normt served frewuently.Never travelling again on tirkish airlines.I always travel wiyh family by turkish airline but no more.zero stars

The crew were very hospitable and pleasant. The food was pretty good. Unfortunately, there was a flight delay of more than 2 hours. We're not sure why but it appeared to be outside the control of Turkish Airlines.

Bough tickets with luggage, but made me pay at Airport as well

The economy seat was so uncomfortable, had not enough leg room for 13 hours flight, front seat basket was broken and couldn’t hold anything, food quality was horrible( we got food poisoned ) we charged for logged which used to be free. We paid too much for this flight and very disappointed. Turkish air line better to make satisfy and respect people instead of find different way to scam people.

This is really the rating of two flights. JFK to IST then IST to NQZ. New York to Istanbul was good. Good crew and all positives. The flight to Astana was so bad that brought it all down. Crew was nonexistent above the minimum, seats were cramped, and it was hot on the plane. Turkish Airlines seems to be slipping down to US based carriers level.

The 2 agents on the check in counter were super nice , helpful and very polite. Boarding was like a 1 2 3, I would recommend Turkish airlines for your next trip.

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