ATL - OPO

$264 Find Cheap Flights from Atlanta to Porto - 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 Atlanta to Porto departing on 10/11. 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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Everything you should know

Cheapest round-trip
$763
Typical prices: $830-$1,212
Turkish Airlines
Mon 9/7Mon 9/28
ATL - OPO • 1 stop
Cheapest one-way
$264
Typical prices: $421-$558
Multiple Airlines
Sun 10/11
ATL - OPO • 3 stops
Top airlines
Cheapest • from $729 (round-trip)
Best reviews • 7.8 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Atlanta and Porto. You'll need at least 1 connection.
Insights
Insights
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Insights
Top layover airports
Cheapest • Avg $423 (round-trip)
Shortest trip • 10h 45m (one-way)
Insights
Insights
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Insights
When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 33% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 31% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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Flight Deals
Booking Insights
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

Mon, Sep 7 - Mon, Sep 28
Turkish Airlines Logo
9:50 pm - 9:45 am
ATL
-
OPO
30h 55m
1 stop
Turkish Airlines Logo
10:40 am - 7:45 pm
OPO
-
ATL
38h 05m
1 stop
$763Turkish Airlines
Sun, Aug 9 - Tue, Aug 25
Turkish Airlines Logo
9:50 pm - 3:50 pm
ATL
-
OPO
37h 00m
1 stop
Turkish Airlines Logo
4:50 pm - 7:45 pm
OPO
-
ATL
31h 55m
1 stop
$817Turkish Airlines
Sun, Aug 9 - Tue, Aug 25
Turkish Airlines Logo
9:50 pm - 3:50 pm
ATL
-
OPO
37h 00m
1 stop
Turkish Airlines Logo
4:50 pm - 7:45 pm
OPO
-
ATL
31h 55m
1 stop
$822Turkish Airlines
Sun, Aug 9 - Tue, Aug 25
Turkish Airlines Logo
9:50 pm - 9:40 am
ATL
-
OPO
30h 50m
1 stop
Turkish Airlines Logo
4:50 pm - 7:45 pm
OPO
-
ATL
31h 55m
1 stop
$823Turkish Airlines
Tue, Sep 1 - Wed, Sep 30
Turkish Airlines Logo
3:05 pm - 3:40 pm
ATL
-
OPO
19h 35m
1 stop
Turkish Airlines Logo
4:40 pm - 7:45 pm
OPO
-
ATL
32h 05m
1 stop
$832Turkish Airlines
Tue, Sep 1 - Tue, Oct 6
Turkish Airlines Logo
9:50 pm - 11:30 pm
ATL
-
OPO
20h 40m
1 stop
Turkish Airlines Logo
10:40 am - 7:45 pm
OPO
-
ATL
38h 05m
1 stop
$841Turkish Airlines
Sun, Aug 9 - Tue, Aug 25
Turkish Airlines Logo
9:50 pm - 9:40 am
ATL
-
OPO
30h 50m
1 stop
Turkish Airlines Logo
4:50 pm - 7:45 pm
OPO
-
ATL
31h 55m
1 stop
$849Turkish Airlines
Mon, Sep 14 - Tue, Sep 29
Turkish Airlines Logo
9:50 pm - 9:45 am
ATL
-
OPO
30h 55m
1 stop
Turkish Airlines Logo
4:50 pm - 7:45 pm
OPO
-
ATL
31h 55m
1 stop
$859Turkish Airlines
Sun, Sep 13 - Tue, Sep 29
Turkish Airlines Logo
9:50 pm - 3:50 pm
ATL
-
OPO
37h 00m
1 stop
Turkish Airlines Logo
10:40 am - 7:45 pm
OPO
-
ATL
38h 05m
1 stop
$862Turkish Airlines
Wed, Oct 7 - Wed, Oct 21
United Airlines Logo
9:29 am - 9:45 am
ATL
-
OPO
19h 16m
1 stop
United Airlines Logo
11:20 am - 12:27 pm
OPO
-
ATL
30h 07m
2 stops
$864United Airlines
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.

How much is a round-trip flight from Atlanta to Porto?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Atlanta to Porto departing in September.

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 March, where tickets cost $582 (return) on average. On the other hand, the most expensive months are June and September, where the average cost of round-trip tickets is $1,295 and $984 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 33% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 12 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$264
Best time to beat the crowds with an average 26% drop in price.
Most popular time to fly with an average 52% increase in price.
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 5 days, the lowest price for a flight from Atlanta to Porto was $264 for a one-way ticket and $729 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, Star Alliance, and SkyTeam are the airline alliances operating flights between Atlanta and Porto, with oneworld 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 $1,118 and an overall rating of 7.8, Delta is the most popular choice. KLM is also a great choice for the route, with an average price of $881 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.
7.8
KLMOverall score based on 1538 reviews
7.2Entertainment
7.3Food
7.8Boarding
7.7Comfort
8.4Crew
Airline reviews

The crew were unprofessional with a racist element. I was physically abused as well from one of the crew members

2.0 MediocreNewton, Mar 2026
IAD - AMS
Read more KLM reviews

The crew were unprofessional with a racist element. I was physically abused as well from one of the crew members

They forgot to serve food and the crew was very unfriendly. Never experienced such a bad KLM flight. Usually fly from Toronto. New York was different.

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.

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 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!

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

Transfer at CDG to connecting KLM flight to Amsterdam was a NIGHTMARE. LONG WALKWAYS, NO MOVING WALKWAYS, POOR signage, Have to take a train & No staff visible to help navigate the maze. AVOID TRANSFER AT CDG AT ALL COST.

Seats were comfortable crew members support was very good but AVML ordered or selected by us needs a lot of improvement.

The plane was clean and the staff was friendly. Food and drinks as expected on international flights. The entertainment system was old style, with a pullout controller, and selections not as extensive as on other flights.

Friendly flight attendant Quick checking for baggage drop Quick TSA lines

It was okay. We were delayed for weather reasons, but the pilots and the flight control staff figured a way around the storm and were able to get us to Los Angeles safely. Not all the staff members were polite, but the entertainment on the flight was good.

So terrible. My flight was 4 hours delayed and we weren't notified til last second within an hour of boarding. WE had to sit on the plane for 4 hours. ridiculous.

Missed the Flight from Atlanta to Roanoke due to initial flight from Houston being 2hr. late. Now waiting 17hrs. till my first available flight.

Internet didn’t work for this leg either. The seat was fine but didn’t have seatback screen, which I knew when I booked it. The biggest letdown is Deltas new policy on beverage/snack service not being served for flights less than 350 miles. I know this is a cost cutting measure, but how much does it really cost to give a drink and a snack for inflated airfare? I really am surprised that with Delta Comfort they don’t provide beverage/snack service given these seats cost extra to purchase. Really need to reconsider this, even if it’s for the Delta Comfort and above.

The team was wonderful. The entertainment screens were not working, so they recommended that we use the plane wifi to watch entertainment on our phones and none of the Delta entertainment links worked. Extremely frustrating process.

The plane was not clean. Vomit was removed from seat-back pocket right in front of me. The flight attendants were rude to one another. 3 children were seated together with their parents across the aisle. The children fought physically with one slamming another’s head into the plane wall at one point. The parents were aware, but took no action to intervene. Delays occurred in Atlanta after boarding before takeoff, in the air, and in Detroit after landing (no ground crew assigned). Flight attendants offered no support for connecting flights. There were weather conditions on each end of the flight, but I didn’t mark down my ratings for these.

London to Atlanta was good. Atlanta to Phoenix was not. Poor boarding as I had to check my rollerboard even though there was plenty of room in the bins. Crew seemed inexperienced. Sat just off the gate for nearly 30 minutes with no explanation from the pilot while the cabin got hot. I typically have a much better experience with Delta.

The flights are constantly late anymore, and they won't even give you a glass of water on the plane. For years, they were able to do a service on this flight from Atlanta to Knoxville and Knoxville Atlanta now they say it's too short of a flight. You can't even get a quick drink of water.

Original flight was delayed, then cancelled and the gate staff did not expedite rebooking. Also, no instructions were given that a ticket number was needed before being called to facilitate rebooking. This could have been much more organized.

Seats! The eternal problem in economy. They are like stones!!

Everything is good except the seats are tightened no rooms for the legs,

The plane's pilots, including the captain himself, thanked me for the flight. I know it's just marketing, but it was really nice to see these people. It's a great idea. Airplane food is never "good," but the entire crew and flight organization were top-notch. I really liked Delta, and I think I've traveled all over the world, and that was something new for me. Maybe even the old planes, the B767, but next time I have a choice, Delta will be my first choice. Thank you, a satisfied passenger :)

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

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.

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.

I did not get my baggage at my final destination..poor coordination with connecting flights with partner airlines (Saudi airways). Also the food was very mediocre.

Not great , just ok . I expected better food but it did not deliver . Flight staff was ok . The guy at the drop off bag counter was the only saving grace in this whole trip . He was pleasant, friendly and very helpful . You couldn’t ask for a better assistance from him .

The first half from DC to Paris was very good and the staff were very helpful and humble BUT flight from Paris to Mumbai was sad. 1) it was packed. 2) no space on head compartment 3) crews were unresponsive to the calls 4) one crew member literally banged the bottle of water after giving me glass of water. A little water splashed on me and she was unapologetic 5) with so many hours of flight, little leg space should be taken care else don’t fill your airline till brim which affects your crew and they remove anger on us. 6) huge line for washrooms. 7) 2nd half journey was pathetic

We flew business class and it was impressive. So comfortable with delicious food and very attentive and polite staff. Will definitely fly Turkish airlines again.

To get to jet blue at JFK from any connecting flight you have to go through security again.

Amazing! One of the best kept secrets in air travel!

We fly Bussines class and we didn’t feel like it is. Out luggage didn’t arrive and we have to return again next day from our hotel to airport to get them. Still waiting. No information from Turkish airlines Very poor customer service I think booking through kayak it was wrong decision

Three screaming and crying children in business class made it very difficult to rest. The crew made no attempt to address the situation. I might as well have saved the money and flown economy. The parents were oblivious to the discomfort their children were causing. The lounge in Istanbul is wonderful, but did not make up for the misery on the flight. My business class seat power outlet was broken and I have a cpap. The crew couldn't fix it or move me to better seat. Fortunately , the passenger in front of me allowed me to plug into his power outlet.

Could have been better. Bag rechecking could have been eliminated. Gate location and direction need to be clearly stated.

After arriving in Istanbul, the transit information on the electronic board showed a tight departure time, and the gate changed in the middle, making it difficult to make it on time.

Paying extra for premium seats was wasted. Turkish Airlines takes 2 seats for bassinet. The lady next to me had a baby with bassinet Bassinet was in front of my seat

This flight was in the air when the national power outage happened on 28 April 2025 in Spain and Portugal. As a result Lisbon airport was closed and the flight was diverted to Porto. There were no phones, internet or ATMs working and the Turkish Airlines ground crew in Porto were trying to find alternative transport to Lisbon (by bus). This did not materialise until late in the evening. The Turkish Airlines ground crew suggested that passengers may find their own way of getting to Lisbon. That in itself is a failure of Turkish Airlines, but understandable as there were no means of communication. The Turkish Airlines ground crew also said that any expenses insured for travel to Lisbon will be refunded by the Airline through their website. Unfortunately, I could find no way to travel back to Lisbon other than to hitch hike with an Uber driver. Because no systems were available and no credit card payment possible I paid the driver 140 Euros in cash with no receipt as systems were down. I arrived at my Lisbon hotel at 23:30 (flight was scheduled to land at 12:30). Upon contacting Turkish Airlines for compensation they are not willing to do anything as I do not have an invoice for my expenses. They do not even consider the 10 hours of delay and inactivity on their part as a reason to provide any sort of curtesy towards me. I find their behaviour appalling.

Very bad from ISTACC leg of flight specifically the seats. These seats are for economy not for Business class. I suppose when flying to a third world country you can fly any craft and no one questions it. I was very disappointed for that leg of the flight. This needs to change.

I had a terrible experience. My flight got delayed from Atlanta to Chicago on Monday April 6, 2026, and that led to me missing my next flight to Brussels. United Airlines didn’t provide me with any accommodation for shelter. I had to sleep at the airport in Chicago. The next flight I was put on didn’t leave until the evening hours of Tuesday 4/7/2026.

Just a bad day to fly. Flight was delayed from scheduled 6:50 pm departure to 8:50 pm. Combination of factors mostly related to weather at the destination airport (which is where the incoming flight originated) which delayed the inbound flight over an hour. Once on board, we taxied but had to hold again on the taxiway for 10 minutes or so. We did not get wheels up until after 9 pm. The flight was smooth but about 18 minutes from our destination, we had to hold for several minutes more due to weather at ORD. We finally landed at ORD about 11:08 pm (accounting for the time difference, that was about a 3 hour delay from our scheduled departure time). It felt like we were never going to get to our destination. But the flight crew and attendants were very good. The movie selection onboard was also very nice. Got to watch half of a movie just during our taxi from the gate at ATL due to the delay!

Everything was great except for the boarding process. Everyone is lining up all at the same time and it’s hard to tell between the groups as they are way too large.

Gate agent at Frankfurt was terrible. She denied PRE boarding even as it was printed on the boarding pass. Refused to look at the boarding pass and literally shouting for no reason. Frankfurt airport has horrible and rude staff who avoids trying to answer any question at all. Overall, horrible experience.

Food was poorly timed and not good.. Hand held snacks, really. I kept asking for water and never got any. Service was rushed for a 7-hour flight.

Excellent experience. Starting with the agent at the Premier bag drop who noticed I was very early for my scheduled flight and offered to rebook me on an earlier flight with my seat preference. She would not let me leave the counter until she knew that all of the changes and new boarding pass showed up on my United app. At the gate, the flight boarded quickly such that we departed early and the flight was smooth. We arrived 20 minutes early at ORD and I was able to be home in time for dinner. One of the best flights I've had.

Cramped seat even in economy plus seat 10A. Over booked flight, no space for the bags

The agents was very rude and they charged me $50 for a carry-on bag saying that it was too big and then I saw someone going on a plane with the same size bag as me

Great onboard crew. Boarding was a zoo, I got in line before pre boarding in Group 2, still had my bag force checked. WiFi was glitchy all flight. Seat and bathroom are both tiny unless you pay $$$ for first class.

The passenger in the row in front of me was listening to a political speech on his phone at full volume with no headphones and it was disturbing all of the passengers around him for several rows. I asked 2 of the flight attendants to speak to this passenger but they only shrugged. It was obvious that they were afraid there might be conflict and would not say anything. I had to take it upon myself to tell the passenger that he needed to turn it off or wear headphones as it was disturbing everyone around him not wearing their own headphones. I was very disappointed in the United flight attendants.

Everything you need to know for your flight from Atlanta to Porto

Information on your arrival and departure airports