HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Chicago

$409+ Cheap flights from Porto (OPO) to Chicago (CHI)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — CHI
Nov 15 — Nov 221
Sat 11/15
Sat 11/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Porto to Chicago with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Porto to Chicago

Discover tips and strategies to find the most affordable flight options for your journey from Porto (OPO) to Chicago (CHI). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 16, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$452
(SmartFares)

One-way from

$409
(Kiwi.com)

Popular in

September

Cheapest in

February

Average price

$762
Provider with most accurate pricing for Porto-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Porto-Chicago (CHI) flights.
Search Deals
From Porto to Chicago (CHI)
Search Deals
One-way flight from Porto to Chicago (CHI)
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($115 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($29 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Find flight deals from Porto to Chicago

Cheapest flights from Porto to Chicago
Explore the most affordable flight options available from Porto to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 16, 2025.

This SmartFares deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/75:35 pmOPO - ORD
1 stop29h 10mScandinavian Airlines
Sun 11/237:20 pmORD - OPO
1 stop15h 25mScandinavian Airlines
Deal found 10/15$452
This SmartFares deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/145:35 pmOPO - ORD
1 stop29h 10mScandinavian Airlines
Thu 11/277:20 pmORD - OPO
1 stop15h 35mScandinavian Airlines
Deal found 10/14$464
This Mytrip deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/79:55 pmOPO - ORD
2 stops26h 00mMultiple Airlines
Sun 11/233:50 pmORD - OPO
1 stop13h 45mMultiple Airlines
Deal found 10/16$616
This Mytrip deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1411:35 amOPO - ORD
2 stops28h 12mMultiple Airlines
Thu 11/278:20 amORD - OPO
3 stops24h 55mMultiple Airlines
Deal found 10/14$679
This oojo deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/168:00 pmOPO - ORD
1 stop25h 00mTAP AIR PORTUGAL
Wed 2/47:10 pmORD - OPO
1 stop15h 50mTAP AIR PORTUGAL
Deal found 10/16$683

Cheapflights Fare Finder

 
Customize your flight search to find flights from Porto to Chicago that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 16, 2025.
Use the filters below to find and compare flights from Porto to Chicago that are best for you.

Fly from

Porto

Fly to

Chicago

Route

Depart

Return

Price

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 11/7

5:35 pm-4:45 pm

1 stop29h 10m

Chicago O'Hare Intl

Sun 11/23

7:20 pm-4:45 pm

1 stop15h 25m

$471

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 11/7

9:55 pm-5:55 pm

2 stops26h 00m

Chicago O'Hare Intl

Sun 11/23

3:50 pm-11:35 am

1 stop13h 45m

$616

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 11/14

5:35 pm-9:27 pm

2 stops33h 52m

Chicago O'Hare Intl

Thu 11/27

7:20 pm-4:55 pm

1 stop15h 35m

$632

PortoChicago

OPO - ORD

OPOORD

Porto

Wed 2/18

8:10 pm-2:30 pm

1 stop24h 20m

Chicago O'Hare Intl

Mon 2/23

10:15 am-9:15 pm

2 stops29h 00m

$647

PortoChicago

OPO - ORD

OPOORD

Porto

Tue 12/16

8:00 pm-3:00 pm

1 stop25h 00m

Chicago O'Hare Intl

Wed 2/4

7:10 pm-5:00 pm

1 stop15h 50m

$683

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 11/24

6:30 am-2:20 pm

1 stop13h 50m

Chicago O'Hare Intl

Mon 12/1

5:20 pm-10:30 am

1 stop11h 10m

$762

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 11/24

6:30 am-2:20 pm

1 stop13h 50m

Chicago O'Hare Intl

Mon 12/1

2:35 pm-10:30 am

2 stops13h 55m

$762

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 11/13

11:15 am-2:20 pm

1 stop33h 05m

Chicago O'Hare Intl

Mon 11/17

5:20 pm-10:30 am

1 stop11h 10m

$763

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 12/5

6:30 pm-2:45 pm

2 stops50h 15m

$409

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 11/24

9:55 pm-3:00 pm

2 stops47h 05m

$412

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/16

Showing 1-10 of 13 results
1
2

Compare providers for flights from Porto to Chicago

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Porto to Chicago in October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Porto-Chicago flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Porto-Chicago flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Porto-Chicago flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Porto-Chicago flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Porto-Chicago flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Porto to Chicago

Have a flexible travel schedule? Discover the best time to fly to Chicago from Porto with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Porto to Chicago
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Porto to Chicago. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Porto to Chicago?

    Located just 6.8 mi from the city center, Porto is the airport most travelers will use when flying to Chicago from Porto. Booking flights from Porto (OPO) to Chicago should be relatively easy as there are 0 daily outbound flights to Chicago from 0 different airlines.

  • How long is the flight from Porto to Chicago?

    Scandinavian Airlines can get you from Porto to Chicago in just under 29h 10m. Your travel time can differ by up to . The distance between Porto and Chicago is about 3931 mi.

  • Can I find deals for flights from Porto to Chicago that include hotel bookings?

    Yes. In addition to deals on Porto to Chicago flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Porto to Chicago?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Porto to Chicago.

  • Can I find deals for business class flights from Porto to Chicago?

    Yes. Cheapflights offers flight deals from Porto to Chicago by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Merrillville
Lansing
Hammond
Porter
Benton Harbor
Chesterton

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Porto to Chicago

See prices for flight routes from nearby airports that may be better suited for you.
Lisbon to O'Hare Intl flights
Porto to O'Hare Intl flights
Faro to O'Hare Intl flights
Lisbon to St. Louis flights
Porto to St. Louis flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.