ORD - OPO

$242 Find Cheap Flights from Chicago 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 Chicago to Porto departing on 12/7. 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 Chicago to Porto.
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Cheap Flights from Chicago to Porto (ORD-OPO)

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

Mon, Oct 27 - Wed, Nov 12
United Airlines Logo
2:22 pm - 9:30 amORD-OPO
14h 08m1 stop
United Airlines Logo
12:35 pm - 11:43 pmOPO-ORD
17h 08m2 stops
$434United Airlines
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Tue, Nov 25 - Tue, Dec 2
 Logo
7:15 am - 11:15 amORD-OPO
22h 00m2 stops
 Logo
12:05 pm - 4:20 pmOPO-ORD
34h 15m1 stop
Mon, Oct 20 - Wed, Nov 5
United Airlines Logo
7:10 am - 9:45 amORD-OPO
20h 35m1 stop
United Airlines Logo
12:35 pm - 11:43 pmOPO-ORD
17h 08m2 stops
$436United Airlines
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Wed, Nov 26 - Wed, Dec 3
 Logo
12:50 pm - 12:05 pmORD-OPO
17h 15m2 stops
 Logo
12:10 pm - 4:20 pmOPO-ORD
34h 10m1 stop
Wed, Nov 5 - Sun, Nov 16
TAP AIR PORTUGAL Logo
7:10 pm - 1:05 pmORD-OPO
11h 55m1 stop
TAP AIR PORTUGAL Logo
5:00 am - 3:00 pmOPO-ORD
16h 00m1 stop
$476TAP AIR PORTUGAL
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Wed, Oct 29 - Sun, Nov 9
TAP AIR PORTUGAL Logo
8:10 pm - 7:45 amORD-OPO
30h 35m1 stop
TAP AIR PORTUGAL Logo
8:55 am - 3:00 pmOPO-ORD
12h 05m1 stop
$483TAP AIR PORTUGAL
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Mon, Oct 20 - Sat, Nov 15
Iberia Logo
9:41 am - 7:35 amORD-OPO
15h 54m2 stops
Iberia Logo
8:20 am - 2:30 pmOPO-ORD
12h 10m1 stop
$499Iberia
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Tue, Oct 21 - Fri, Oct 31
Lufthansa Logo
9:40 pm - 11:20 pmORD-OPO
19h 40m1 stop
Lufthansa Logo
12:30 pm - 9:05 pmOPO-ORD
13h 35m1 stop
$503Lufthansa
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Wed, Oct 15 - Wed, Oct 22
American Airlines Logo
10:11 am - 7:35 amORD-OPO
15h 24m2 stops
American Airlines Logo
8:15 am - 2:15 pmOPO-ORD
12h 00m1 stop
$506American Airlines
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Tue, Oct 21 - Sat, Nov 1
Lufthansa Logo
3:35 pm - 10:25 amORD-OPO
12h 50m1 stop
Lufthansa Logo
6:00 am - 6:26 pmOPO-ORD
17h 26m2 stops
$524Lufthansa
Find Deal

Everything you should know

Top airlines
United Airlines
Cheapest • from $434 (round-trip)
KLM
Best reviews • 7.8 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 12% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
February
Cheapest • 27% price drop
September
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$434
Overall average: $638
United Airlines
Mon 10/27Wed 11/12
ORD - OPO • 1 stop
Cheapest one-way
$242
Typical prices: $473-787
Multiple Airlines
Sun 12/7
ORD - OPO • 2 stops
Start a new search
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We hope you love your trip to Porto!
Booking Insights

KAYAK's insights & trends for Chicago to Porto flights

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

The average price of all round-trip flights from Chicago O'Hare Intl Airport to Porto clicked on KAYAK for each day over the last 12 months.

When flying from Chicago to Porto, you should consider leaving on a Friday and avoid Thursdays if you are looking for the best rates. For your return to Chicago, you’ll find the best rates on Saturdays and the most expensive ones on Fridays.

What is the cheapest month to fly from Chicago O'Hare Intl Airport to Porto?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Chicago O'Hare Intl Airport 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 Chicago O'Hare Intl Airport to Porto is February, where tickets cost $497 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $906 and $768 respectively.

How far in advance should I book a flight from Chicago O'Hare Intl Airport 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 Chicago O'Hare Intl Airport 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 Chicago O'Hare Intl Airport to Porto, you should book around 2 weeks before departure, which saves you about 12% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 26 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$242
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly with an average 6% increase in price.
Flight from Chicago to Porto

When to book flights from Chicago to Porto

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

  • What are the luggage services available at Porto Airport?

    The airport offers free-of-charge luggage trolleys within the airport. Go to the landside to get your baggage wrapped to protect it from damages. Do you require a storage area for your bags as you tour the airport? Porto Airport has a storage room and lockers on the landside, 3rd floor of Departure level, available for you to store your bags. To acquire a storage room, you have to pay a fee of around €2 (2$2.04) to €7 ($7.16), depending on your luggage weight. The locker rooms are on the ground floor of the landside and go for roughly a minimum of €2 ($2.04).

  • Does Porto Airport have baby care facilities?

    Porto Airport has baby care rooms that are fully equipped on the landside and airside. If your child is about 15kg or less, the airport provides free-of-charge baby strollers that you can use within the airport premise. The pick-up station for the baby strollers is on the 2nd floor of the airside. The strollers are only allowed in the post-security areas.

  • How can I get to Porto city centre from Porto Airport?

    Regardless of the part of Porto that you would like to visit from the airport, there is always a bus in the bus system that fits your destination needs. If you want a car rental instead, there is a level Zero at the terminal where the service is accessible. You can opt for taxi services at the Arrivals area to access the town from the airport.

  • Does Chicago O’Hare International Airport offer accessibility services?

    ORD provides wheelchairs at the airport to passengers with mobility impairment. The airport also has TSA cares program that helps passengers with special needs in the process of security screening. You can also access all the airport restrooms as they are all wheelchair accessible. I designed the service animal relief area to be accessed by the pet and the owner. Chicago Airport has equipped all terminal elevators with Braille and raised numerals to allow all passengers access and use.

  • What is the cheapest flight from Chicago O'Hare Intl Airport to Porto?

    In the last 3 days, the lowest price for a flight from Chicago O'Hare Intl Airport to Porto was $242 for a one-way ticket and $434 for a round-trip.

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

    Yes

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

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

  • Which airline alliances offer flights from Chicago to Porto?

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

  • What is the most popular layover when flying to Porto from Chicago?

    Lisbon is the most popular layover city among KAYAK users traveling from Chicago to Porto.

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

    The two airlines most popular with KAYAK users for flights from Chicago to Porto are Delta and KLM. With an average price for the route of $828 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 $698 and an overall rating of 7.8.

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

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto from Chicago 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 Chicago 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 Chicago with another airline. Booking your flights between Chicago 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 Chicago 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 Chicago up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Chicago O'Hare Intl Airport to Porto

  • Chicago O’Hare International Airport (ORD) has four accessible terminals 2, 3, 4, and 5 and 9 concourses B, C, E, F, G, H, K, L, and M. The four terminals are interconnected by automated trains that allow you easy access to all the terminals. Terminal 5 is located across the taxi strip, while the first three terminals are in the same building.
  • If you have kids and want them to wear off some of their energy before the flight departure time, you can have them visit the ORD family lounge, equipped with different video games, toys, and climbing structures. The family play area is in the Main Hall of terminal 2.
  • It takes about 4030lbs of carbon emitted per person to fly from Chicago O’Hare Airport to Francisco Sá Carneiro Airport (OPO). Tap Air Portugal is one of the least carbon-emitting flights flying the ORD-OPO route, with 28% less CO₂ hence suitable.
  • Whether you are having your layover in Newmark or Lisbon Humberto Delgado, you still will be traveling for long hours. Having some form of entertainment would come in handy. You can travel with airlines like Spirit Airlines, which offers Wi-Fi to make the journey tolerable.
  • One of the most vital needs as soon as you land in Porto from Chicago is liquid money. Find the Santander bank, located on the 3rd floor of landside, offering automatic banking services. You will need currency exchange services as well. Get to the ground and 3rd floor of the landside area to access Nova Câmbios for currency change.

Reviews of the top 5 airlines serving from Chicago to Porto

 
See real verified KAYAK customer reviews for airlines flying from Chicago 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 Chicago 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 1385 reviews
7.8Boarding
7.2Entertainment
8.4Crew
7.3Food
7.7Comfort
Airline reviews

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.

2.0 MediocrePeter, Aug 2025SAN - AMS
Read more KLM reviews

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.

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!

Klm start boarding while somw air issue in the plan

The service was great. However the lounge only gets passing grade

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.

Once we got in the air the pilot made up some of the time of the delay. So that was really nice.

We had a layover from YVR to Denver. We bought 4 bottles of Absolut Vodka at the YVR Duty Free for $116.20, after going through security and American Customs Pre Clearance at YVR, Vancouver. When we landed in Denver, United put us behind the American Customs as well as TSA again for some reason. We were forced to go through American Customs and TSA again. TSA confiscated our rightfully owned Duty Free Absolut Vodka bottles. Because United incorrectly forced our flight behind American border and TSA again, we missed the connecting flight. After United put us on a later flight, we eventually arrived in Chicago very late, with hardly any sleep. I am looking for compensation from United for our incorrectly confiscated Absolut Vodka bottles worth $116.20, as well as compensation for incorrectly putting us behind American Customs and TSA again, causing us to miss our connecting flight, making us arrive extremely late in Chicago.

Excellent flight. Boarding was efficient and departure was on time. Smooth flight with on time arrival. Deplaning was also efficient.

It was delayed instead of departing at 9:20pm, we departed at 11pm… putting us in Columbus after 2am! It was awful. Had I known about the delay, I could have spent some time in the United Lounge… I was starving because I started my journey in Budapest… so I was exhausted and hungry. Plus I had to make new arrangements to be picked up at the airport in Columbus, instead of midnight it was 2:30 am after getting luggage and out of airport. Not feasible. I would have just stayed in Chicago for the night and gotten a morning flight.

It was great, I’m very grateful for the pilots and crew flight attendants for everything.

Evidently, my seat had the only broken TV. I couldn’t plug it in, get it to come on, or watch anything, and of course, no one could fix it while we were on the plane. The service was good and the boarding was quick

The boarding of took of late.The presentation of the food was horrable as was the tast of the food was cold and tastless.

Delay and keep changing gates. I have to run around from B to C then to E.

I was charged for my daughters bag when I am supposed to receive two free checked bags with my United Explorer card.

The schedule to Moline changed 5 times. The gate changed 6 times. That is a pathetic way to run an airline. No wonder that no one in our company flies on United Express to or from Moline. Changes happen most of the time. I learned my lesson on this trip…never again!

An old airplane with very uncomfortable seats in the Comfort “class! Small, narrow, and hard seat. Entertainment options are inferior, old movies. Boarding started at the back of the airplane, as we entered the aircraft last instead of after business class, risking the possibility that the comfort section would not have room for carry-on in the overhead bin. The food was ok. White wine was terrible. Overall, the flight felt worse than cheap airliners, and the price was as high as premium carriers.

I will avoid TAP if I can, the ground experience was very poor with bad behaviour from the ground crew and it was only a bit better on the aircraft.

I had a business class ticket from EWR to Madrid with a layover at LIS for 11 hours. It was obvious that I needed to pick up my luggage in Lisbon for 11 hours and check it in again when boarding the second flight to Madrid. Before buying the ticket, I called TAP customer service. Customer service assured me that I could get my luggage in Lisbon. When I arrived at Newark airport, I immediately asked to check my luggage to Lisbon. However, the TAP employee refused me, saying that I should resolve this issue upon arrival in Lisbon. She checked my luggage to Madrid. I asked the TAP employee at the gate to help me when boarding the plane, I asked the flight attendants manager on board the plane to help me. All the employees refused to help me and said that I should resolve this issue in Lisbon. It took me 4 hours to resolve this issue in Lisbon. I arrived at 11am and they didn't give me my luggage until 3pm. As a result, I was so tired after a sleepless night on the plane and 4 hours on my feet at the airport and all my plans were ruined that I couldn't fly to Madrid. It was a terrible experiance,

The seats were not designed to comfortably see people in coach for more than 10 minutes

A good, comfortable flight with friendly crew and good entertainment options.

Very rude person at the boarding desk; flight attendant coughing 3 inches from my face three times- not even covering her mouth; boarding process very unacceptable for older people with stairs to all planes (are you all stuck in the 1960’s?). I am sure that I am not remembering all of the negative things, but I am sure you get the message!

There was chaos at the Naples airport. We arrived three hours early for the flight but there was no invitation available about where to go to check bags until an hour later. Then we had to go to a different terminal to check our bags and check in and back to the first to board.

We flew TAP last October from Newark to Lisbon. The meal was bad. This flight had good food. Also, this flight was delayed. There were TAP employees waiting at Lisbon to make sure we made our connecting flight. I find the TAP website and app frustrating, but the service once we reached the airport was very good

The airport temperature at the airport and on the flight was too warm

Boarding too way too long. Biggest peeve: zero in-seat power in economy! No plug sockets, no USB ports. Plane was an A330, so not old.

It was fortunate that the flight arrived in London in accordance with schedule, and the luggage was promptly transferred to the luggage carousel. However, I find it concerning that even minor issues in economy cabins are prevalent within the industry. American Airlines, in particular, appears to have the least legroom and feels more crowded due to the proximity of neighboring passengers. Additionally, the crew’s adherence to protocol is inconsistent. While they may enforce certain rules set by the FAA on a select few individuals, they often overlook numerous violations, such as failing to reset seat recline during landing.

We liked the flight but while we purchased an aisle seat, our seats had a different configuration on this flight. A fellow passenger suggested that the airplane had been changed. Too bad we were not informed and had no chance to modify our seat preferences. We were stuck in the window and middle seats with no chance to walk around and go to the bathroom without disturbing our sleeping fellow passenger.

The crew were not very personable. The crew did not serve tea or coffee. The bathroom was not kept clean. Two out of the 5 toilets in the cabin weren't working.

It was extremely cold in the back of the plane. The seats are uncomfortable and space very small. Crew was excellent as usual.

Check in needed to be in person, not nice. Also I won’t do connections in Charlotte again because you need to go through security again and short connections become a problem

Iberia lost my bag, said they found it in another country, said they sent it to me, but never did. Went my whole trip without my stuff, but expecting it to show up because that’s what they said would happen. Their communication sucks, their website sucks, and to top it all off, their seats are small and uncomfortable. They’re bad at their jobs and they should feel bad about themselves. Do not even get me started on the flight home. AVOID!

I described my experience in the previous window. I didn't realize that there would be another opportunity for this flight. Please look at my response in the previous window.

Boarding was 2 1/2 late no explanation Captain said he did not know why, but he rested at home for an extra couple of hours. Food was edible, Nothing more.

I liked the comfort of the plane. It was unexpected from past experiences.

BEWARE!!! Iberia changes your seats at random. I paid for a window seat and they changed it to one in the middle aisle resting against the bathroom- can’t lean back + hear every flush. This on a 11 hour flight.. There were families that were broken up with separate seats all over the plane. Lots of upset passengers showing their seat confirmation to the besieged and helpless airline steward. Also, the gluten free meal was tasteless.

I liked Quiet people around me. Crew could have helped people with overhead luggage so they aren't moving other peoples bags around and causing problems for people that had there bags there first

The flight and crew were good. The customer experience on the ground could have been better. We had to reschedule our flight because of a delay on the previous flight. The attendants working the desk in Washington DC were not helpful. They told us to scan a QR code and that would get us rebooked. Why couldn't two people standing at their computers do this? We had to chat with someone to get everything figured out. It was extremely confusing.

The plane was delayed by two hours in Chicago which led to us missing the next flight. Lufthansa rebooked the flight and booked us a hotel for the night in Frankfurt. The level of customer service and getting us taken care of was superb. The flight crew and the service on the ground was superb.

It was a short flight, everything was good with it.

Flight was delayed over one hour and I had to pay to select my seat, even though my booking supposedly had free selection (I paid extra for this at time of booking)

Stop charging for alcohol overseas flights and start taking cash again not everyone wants to pay with card if the person is bigger give him seat on the outside seats not the middle in between the people is common sense and mainly if you fly for Lufthansa provides the sam service and experience...

good entertainment package but rather small seats for business class

The male attendant has zero personality. It seemed like he was over worked or hated his job, not once did he smile or made any contact with the people on the plane. Strictly business and call it a day!

Booked Economy but it translated to economy light for Lufthansa so now we are stuck paying an extra $75 per person both ways for our checked bags. If I had known that, I would have never booked these tickets because it came out to be more than other options. The booking in the kayak side clearly says Economy and has a link to the inormation for Lufthansa which states Economy included a checked bag. Super annoyed about that.

The flight from Dulles to Munich was just okay. The seats were comfortable and extra foot room was noticeable in comfort plus. Disappointed in the booking in so much I requested an aisle seat and then was assigned a middle seat. The food was inedible. Movie choices were moderate. I usually fly Delta, but this WA flight was cheaper. Next time, I'll happily pay the extra to fly Delta.

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