$305 Find Cheap Flights from Portugal to Chicago O'Hare Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Chicago departing on 2/9. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Chicago O'Hare Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results for flights to Chicago, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results for flights to Chicago, as well as popular online travel agencies
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Cheap Flights from Portugal to Chicago

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

Fri, Nov 14 - Thu, Nov 27
Scandinavian Airlines Logo
5:35 pm - 4:45 pmOPO-ORD
29h 10m1 stop
Scandinavian Airlines Logo
7:20 pm - 4:55 pmORD-OPO
15h 35m1 stop
$461Scandinavian Airlines
Find Deal
Fri, Nov 14 - Thu, Nov 27
Scandinavian Airlines Logo
5:35 pm - 4:45 pmOPO-ORD
29h 10m1 stop
Scandinavian Airlines Logo
7:20 pm - 4:55 pmORD-OPO
15h 35m1 stop
$464Scandinavian Airlines
Find Deal
Tue, Nov 11 - Sun, Nov 16
TAP AIR PORTUGAL Logo
6:00 pm - 3:00 pmOPO-ORD
27h 00m1 stop
TAP AIR PORTUGAL Logo
8:25 pm - 3:20 pmORD-OPO
12h 55m1 stop
$548TAP AIR PORTUGAL
Find Deal
Tue, Nov 11 - Sun, Nov 16
Aer Lingus Logo
10:50 am - 5:55 pmLIS-ORD
13h 05m1 stop
Aer Lingus Logo
3:50 pm - 10:10 amORD-LIS
12h 20m1 stop
$548Aer Lingus
Find Deal
Tue, Nov 11 - Sun, Nov 16
TAP AIR PORTUGAL Logo
6:00 pm - 3:00 pmOPO-ORD
27h 00m1 stop
TAP AIR PORTUGAL Logo
8:25 pm - 1:00 pmORD-OPO
10h 35m1 stop
$550TAP AIR PORTUGAL
Find Deal
Fri, Nov 7 - Fri, Nov 14
Aer Lingus Logo
10:50 am - 5:55 pmLIS-ORD
13h 05m1 stop
Aer Lingus Logo
3:50 pm - 10:10 amORD-LIS
12h 20m1 stop
$560Aer Lingus
Find Deal
Mon, Nov 24 - Mon, Dec 1
KLM Logo
6:30 am - 2:20 pmOPO-ORD
13h 50m1 stop
KLM Logo
5:20 pm - 10:30 amORD-OPO
11h 10m1 stop
$741KLM
Find Deal
Mon, Nov 24 - Mon, Dec 1
KLM Logo
6:30 am - 2:20 pmOPO-ORD
13h 50m1 stop
KLM Logo
5:20 pm - 10:30 amORD-OPO
11h 10m1 stop
$758KLM
Find Deal
Thu, Nov 13 - Mon, Nov 17
Delta Logo
6:35 am - 9:55 pmOPO-ORD
21h 20m2 stops
Delta Logo
10:35 am - 10:30 amORD-OPO
17h 55m2 stops
$769Delta
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Wed, Nov 12 - Sun, Nov 23
Delta Logo
6:00 am - 9:55 pmOPO-ORD
21h 55m2 stops
Delta Logo
3:50 pm - 3:25 pmORD-OPO
17h 35m2 stops
$774Delta
Find Deal

Everything you should know

When to travel
November
Cheapest • 30% price drop
June
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$461
Scandinavian Airlines
Fri 11/14Thu 11/27
OPO - ORD • 1 stop
Cheapest non-stop
$792
TAP AIR PORTUGAL
Wed 11/5Wed 11/12
LIS - ORD • Non-stop
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We hope you love your trip to Chicago!
Booking Insights

KAYAK's insights & trends for flights to Chicago

Get data-powered insights and trends for flights to Chicago to help you find the cheapest flights, the best time to fly and much more.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights to Chicago O'Hare Intl Airport, 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 to Chicago O'Hare Intl Airport is November, where tickets cost $590 on average for one-way flights. On the other hand, the most expensive months are August and January, where the average cost of tickets from Portugal is $1,210 and $981 respectively. For return trips, the best month to travel is November with an average price of $590.

What is a good deal for flights to Chicago O'Hare Intl Airport?

If you’re looking for cheap airfare to Chicago O'Hare Intl Airport, 25% of our users found tickets to Chicago O'Hare Intl Airport for the following prices or less: From Lisbon $670 one-way - $884 round-trip.

Good to know

Low seasonFebruary
Cheapest flight$305
Best time to beat the crowds but there is an average 6% increase in price.
Most popular time to fly and prices are also 9% lower on average.
Flight from Lisbon to Chicago

FAQs - booking Chicago O'Hare Airport flights

  • How far is Chicago O'Hare Intl Airport from central Chicago?

    You’ll need to travel 16 miles to reach the Chicago city center from Chicago O'Hare Intl Airport.

  • How much is a flight to Chicago?

    On average, a flight to Chicago costs $885. The cheapest price found on KAYAK in the last 2 weeks cost $568 and departed from Lisbon Humberto Delgado Airport.

  • What is the cheapest day to fly to Chicago?

    Based on KAYAK data, the cheapest day to fly to Chicago is Thursday where tickets can be as cheap as $748. On the other hand, the most expensive day to fly is Sunday, where prices are $1,111 on average.

  • How does KAYAK find such low prices on flights to Chicago O'Hare Airport?

    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 to Chicago O'Hare Airport.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Chicago O'Hare Airport is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights to Chicago O'Hare Airport?

    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 Chicago O'Hare Airport 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 to Chicago O'Hare Airport?

    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 Chicago O'Hare Airport 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 Chicago O'Hare Intl Airport?

    The cheapest time of day to fly to Chicago O'Hare Intl Airport is generally in the afternoon, when flights cost $932 on average. The most expensive time of day to fly to Chicago O'Hare Intl Airport is generally in the morning, which is peak travel time and where the average cost of a ticket is $1,209.

Top tips for finding cheap flights to Chicago O'Hare Airport

  • Looking for cheap airfare to Chicago O'Hare Airport? 25% of our users found round-trip tickets to Chicago O'Hare Airport for the following prices or less: From Lisbon $1,275
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Chicago O'Hare Airport flight deals.

Reviews of the top 5 airlines serving from Portugal to Chicago

 
See real verified KAYAK customer reviews for airlines flying to Chicago. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Portugal to Chicago. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with to Chicago? 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 7977 reviews
7.9Comfort
7.3Food
8.2Boarding
7.9Entertainment
8.5Crew
Airline reviews

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

6.0 GoodFernando, Oct 2025SAN - ATL
Read more Delta reviews

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

We were delayed, which I think had to do with air traffic control. Otherwise, everything was great.

The boarding process needs to be refined. Sometimes the gate crew calls out the zones and then flip to showing the.zones boarding on the gate monitor display. So, unless you are huddled around the gate lanes watching the monitor, you could miss your boarding zone. Suggest the zones be announced each time a new zone is allowed to board.

The boarding process needs to be refined. Sometimes the gate crew call out the boarding zone, and then flip to the monitor to show which zones are boarding. So unless everyone is gathered around to see the monitor there is usually confusion as wi which zones are boarding.

On time flight. Seat comfort could be better in the Comfort section.

My issue was with TSA agents for delta airlines. My luggage got flagged. The agent was going thru another persons first. He took 20 min to go thru hers. I asked them to bring mine closer so I could sit down . They said you can go sit it will be fine. I said I am supposed to keep my eyes on my bags at all times. The agent was meticulously unwrapping 2 gifts that the lady had and then tried to re warp it. He was trying to be kind i get it but 20 min for me to stand watching him do that was ridiculous. It was 6 am and there were a ton of travelers. Mine was flagged for some air packed tea that I bought in Turkey. My previous delta flight and 2 others before didn’t flag it. Consistency would be nice. Also on the flight the window shades were down for take off and landing - I thought that was very odd I thought they had to remain open for take off and landing.

The flight was an hour and a half late departing which was inconvenient

Delay in SLC jammed us up in Chicago. Got caught up in rush hour traffic

The crew took good care of us. The flight from ATL to SFO is a longer one, and there were multiple beverage offerings. I like the 757's that Delta uses. Good airplane that is comfortable. I do wish Delta would separate Priority boarding from the better seats. I would gladly take a smaller seat in an open row than be jammed into Comfort just to get priority boarding, just to make sure I don't have to check a bag.

The crew was not very visible. This might be a good thing for people who wanted to sleep but seemed odd when compared to the Atlantic crossing where they are more present in the cabin. The Food (beef) was not good. Tough and tasteless. Would love to see more choices on a long flight like that.

At the airport, terrible, I do not want to even remember it. It was too humiliating for a business class passenger.

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.

Couldn’t get boarding pass in SLC even with help from a redcoat, so had to find a desk in AMS to get boarding pass. Technical problems so not sure why. Very inconvenient. The KLM app is not as user friendly as most apps. Also had to wait almost an hour on the tarmac for a fuel truck, which caused us to miss a connecting bus in LUX.

The immigration hall in Amsterdam was understaffed, so passport checking was slower than it should be for a major airport. They need to get the automatic readers up and running for non EU passport holders. Waiting in line after a long flight feels a bit abusive.

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.

Short flight so it was okay. Nice crew, all very pleasant and professional. We were near the back in row 27 so just as we got our drinks, we started our descent so had to drink very quickly!

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

Our first flight was delayed so we missed our connecting flight. However it was easy to book a later flight on their app.

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

Trip was great. A wild landing in Ottawa with the wind and rain, but the pilot did a great job. Always love flying United.👍

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.

Salina to travers city was great! But the sept 24 Tranverse city was not! Traverse city to chichago was cancelled, i went to Denver & got to Salina 6 hours later!

See previous note about the passenger in Denver who threw my husband's bag out of the overhead bin in order to maker room for his own. And the flight attendant back up the new passenger.

Could have said yes to a glass of wine 🍷 instead of saying we'll come around in a couple of hours

My flight was delayed about 1 1/2 hours in Chicago, but other then that it was a good flight.

Flight attendant in first class gave poor service (like he didn't want to be there) and food was awful. We sat waiting for gate upon arrival over 45 mins.

Inoperable monitor left no entert for 9 hours. Crew was not helpful Food was awful.

Weather delay in Chicago?. No sense of urgency to make connection in Chicago for our connecting flight that wasn't delayed. Connection was missed.

The boarding process was not good. From check-in, there was only one desk for check-in, which made for a very long line. I asked to print out my boarding pass for the next leg of my trip, also via Aer Lingus, and they said they couldn't. I was unable to do this on the app or online, either. Many fellow passengers I spoke to had the same issue. Because the plane was delayed taking off by 90 minutes, everyone had to quickly go to a desk for their next boarding pass which was chaos. Overall it wasn't a smooth or happy experience.

The seats needs to be comfortables, at least please add more padding to the seats.

Incredible service. Incredible entertainment. I felt like they just kept serving us something new avery hour. My wife and I both had a joyous flight.

I was so grateful for the kindness of the crew. They made a long trip very pleasant. Food was delicious. Many movie options

My flight from Dublin was delayed two hours which ment that I missed my connecting flight to Phoenix. American Airlines provided a hotel room and rebooked my flight for 7:30 AM the next day. I didn't get to the room until 11 pm and I had to be at the airport the next day by 5 AM. The airlines did their best but the schedule was challenging for an 81 year old.

Dinner was fabulous. Would have enjoyed a wine with it. None offered... for sale??? Breakfast was disappointing but adequate amount of food.

Dublin airport is big and US Customs and Immigration screening officers are is part of the process there. This eliminates screening upon arrival to US, however should be taken into consideration when playing your transfer. After all, pleasant experience enhanced by draft Guinness and Irish coffee at the buffet area near the gate. We loved boarding by the row, back of the airplane first.

There was a mixup with our tickets. They said they did not receive payment for them but yet we had seat assignments. We had to purchase last-minute tickets which cost us three times as much. that’s why they got a rated of a one.

I was pleasantly surprised and enjoyed the services of the airline since flying is not my favorite thing. My goal was to be with my brother's family in Manchester after his death. All staff was helpful, the food appreciated since I selected an overnight flight. Every aspect of the experience was comforting. I plan to return to Manchester in order to attend my brother's funeral in October and hope that I am able to find a reasonable priced flight. Thank you

Terrible. So upset either way this flight. We scrambled to make it as it was delayed an hour.

The person at the checkin was very helpful. We couldn’t check in through the keyosk, but the agent was very helpful.

Great price for really nice seats and the plane and staff were great, only 5-10 minute delays!

Tap was very frustrating in Lisbon. Not enough direction and help. Mixed messages of where we needed to go. Seats were not very comfortable.

Everything went as expected. Luggage arrived at my same destination and nothing disturbed my vacation.

This flight arrived late. We joined well over a thousand of other people waiting to go through customs. Air Portugal has lost my bag. We had to chase down a representative even though we had waited at the baggage claim for well over 1 hour and 35 minutes for baggage to come. No representative was there to explain the delay or to give any direction. After 1 hour and 35 minutes at least four passengers had no baggage to pick up or had a fraction of their baggage. The representative was a young woman who clearly did not have the experience to deal with what was happening. Very disappointing as of course we were dealing with great amount of jet lag and having been up for 24 hours at that point and not being able to have any of the things necessary at home that were contained in the bag was quite upsetting. That instant occurred last night at approximately 11:15 p.m. and as of 12:30 p.m. the next day I have not heard anything from Air Portugal.

Check-in guidance for transfer flight, boarding, in-flight service, seat comfort, etc.

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!

Flight was fine. Second meal ( fish sandwich on hard roll) was awful. My suitcase didn’t make the flight. It had been located, but won’t be delivered until tomorrow. Five days after flight

Boarding experience was awful. TAP claims I did not have check in luggage with tickets. I went 3-4 check in agents until I finally found a helpful kind agent who checked in my luggage with no fees. On top of that our flight was over 2 hours delayed with barely an apology or explanation.

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

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