HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Chicago

$478+ 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 6/18. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — CHI
Feb 27 — Mar 61
Thu 2/27
Thu 3/6
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 February 22, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$618
(Booking.com)

One-way from

$478
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$660
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. 17% potential increase in price ($176 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 22, 2025.

This Gotogate deal was found by Cheapflights users on 2/22. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/185:55 pmOPO - ORD
1 stop28h 15mScandinavian Airlines
Thu 5/17:15 pmORD - OPO
1 stop15h 50mScandinavian Airlines
Deal found 2/22$615
This British Airways deal was found by Cheapflights users on 2/21. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/168:15 amOPO - ORD
1 stop12h 00mBritish Airways
Mon 4/2110:20 pmORD - OPO
1 stop15h 30mBritish Airways
Deal found 2/21$669
This United Airlines deal was found by Cheapflights users on 2/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/236:00 amOPO - ORD
2 stops32h 01mUnited Airlines
Sun 3/304:00 pmORD - OPO
1 stop11h 45mUnited Airlines
Deal found 2/21$697
This Lufthansa deal was found by Cheapflights users on 2/20. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/246:15 amOPO - ORD
1 stop18h 10mMultiple Airlines
Mon 12/14:10 pmORD - OPO
1 stop13h 05mMultiple Airlines
Deal found 2/20$713
This Lufthansa deal was found by Cheapflights users on 2/21. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/126:00 amOPO - ORD
1 stop12h 55mLufthansa
Tue 6/246:00 pmORD - OPO
1 stop23h 20mLufthansa
Deal found 2/21$718
This KLM deal was found by Cheapflights users on 2/21. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/2311:15 amOPO - ORD
1 stop33h 15mKLM
Sun 3/305:10 pmORD - OPO
1 stop16h 20mKLM
Deal found 2/21$724
This American Airlines deal was found by Cheapflights users on 2/21. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/128:15 amOPO - ORD
1 stop12h 00mAmerican Airlines
Tue 6/248:05 amORD - OPO
2 stops17h 30mAmerican Airlines
Deal found 2/21$736
This Iberia deal was found by Cheapflights users on 2/22. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/138:15 amOPO - ORD
1 stop12h 00mIberia
Mon 6/233:24 pmORD - OPO
2 stops14h 16mIberia
Deal found 2/22$737
This Delta deal was found by Cheapflights users on 2/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/245:00 amOPO - ORD
2 stops19h 40mDelta
Mon 12/11:35 pmORD - OPO
2 stops15h 15mDelta
Deal found 2/20$738
This Turkish Airlines deal was found by Cheapflights users on 2/22. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/184:50 pmOPO - ORD
1 stop22h 50mTurkish Airlines
Thu 5/17:50 pmORD - OPO
1 stop32h 00mTurkish Airlines
Deal found 2/22$825
This SWISS deal was found by Cheapflights users on 2/22. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/197:20 pmOPO - ORD
1 stop22h 50mSWISS
Thu 4/242:20 pmORD - OPO
2 stops17h 25mSWISS
Deal found 2/22$828
This Kiwi.com deal was found by Cheapflights users on 2/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1910:00 amOPO - ORD
1 stop12h 10mTAP AIR PORTUGAL
Sat 4/266:15 pmORD - OPO
1 stop14h 45mTAP AIR PORTUGAL
Deal found 2/21$843

Find flights from Porto to Chicago within your budget

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 February 22, 2025.

Fly from

Porto

Fly to

Chicago

Route

Depart

Return

Price

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 4/18

5:55 pm-4:10 pm

1 stop28h 15m

Chicago O'Hare Intl

Thu 5/1

7:15 pm-5:05 pm

1 stop15h 50m

$615

PortoChicago

OPO - ORD

OPOORD

Porto

Wed 4/16

8:15 am-2:15 pm

1 stop12h 00m

Chicago O'Hare Intl

Mon 4/21

10:20 pm-7:50 pm

1 stop15h 30m

$669

PortoChicago

OPO - ORD

OPOORD

Porto

Sun 3/23

6:00 am-9:01 am

2 stops32h 01m

Chicago O'Hare Intl

Sun 3/30

4:00 pm-9:45 am

1 stop11h 45m

$697

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 6/12

6:00 am-12:55 pm

1 stop12h 55m

Chicago O'Hare Intl

Tue 6/24

6:00 pm-11:20 pm

1 stop23h 20m

$718

PortoChicago

OPO - ORD

OPOORD

Porto

Sun 3/23

11:15 am-3:30 pm

1 stop33h 15m

Chicago O'Hare Intl

Sun 3/30

5:10 pm-3:30 pm

1 stop16h 20m

$724

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 6/12

8:15 am-2:15 pm

1 stop12h 00m

Chicago O'Hare Intl

Tue 6/24

8:05 am-7:35 am

2 stops17h 30m

$736

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 6/13

8:15 am-2:15 pm

1 stop12h 00m

Chicago O'Hare Intl

Mon 6/23

3:24 pm-11:40 am

2 stops14h 16m

$737

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 4/11

6:40 am-6:19 pm

2 stops17h 39m

Chicago O'Hare Intl

Mon 4/21

4:20 pm-10:40 am

1 stop12h 20m

$749

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 4/18

9:15 pm-1:50 pm

1 stop22h 35m

Chicago O'Hare Intl

Thu 5/1

10:10 pm-7:35 am

1 stop27h 25m

$753

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 4/18

4:50 pm-9:40 am

1 stop22h 50m

Chicago O'Hare Intl

Thu 5/1

7:50 pm-9:50 am

1 stop32h 00m

$825

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/21

Showing 1-10 of 22 results
1
2
3

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 February.
ProviderPrice AccuracyTrust Score*
AranGrantPrice Accuracy3 starsTrust Score*1 star
FlightHubPrice 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.

Travel insights for flights from Porto to Chicago

Get recent, data-driven insights about flights from Porto to Chicago including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Porto to Chicago?

Currently, August is the cheapest month in which you can book a flight from Porto to Chicago (average of $245). Flying from Porto to Chicago in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Rainfall in Chicago by month

Plan your trip to Chicago by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Chicago ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Chicago when rainfall is around 1.7 in.

Temperature in Chicago by month

Plan your trip to Chicago by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Chicago, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Chicago

Get insights into the airlines that provide service to Chicago. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Chicago. Reviews last updated February 22, 2025.
Delta
8.0
Very good
8,203 reviews

Boarding

8.2

Crew

8.5

Comfort

8.0

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta
8.0
Very good
8,203 reviews
Delta
8.0
Very good
8,203 reviews

Boarding

8.2

Crew

8.5

Comfort

8.0

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM
7.8
Good
1,330 reviews
Delta
8.0
Very good
8,203 reviews

Boarding

8.2

Crew

8.5

Comfort

8.0

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

SWISS
7.5
Good
1,566 reviews
Delta
8.0
Very good
8,203 reviews

Boarding

8.2

Crew

8.5

Comfort

8.0

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

United Airlines
7.4
Good
8,754 reviews
Delta
8.0
Very good
8,203 reviews

Boarding

8.2

Crew

8.5

Comfort

8.0

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Turkish Airlines
7.3
Good
3,825 reviews
Delta
8.0
Very good
8,203 reviews

Boarding

8.2

Crew

8.5

Comfort

8.0

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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 1 airline.

  • What are the cheapest airlines flying from Porto to Chicago round-trip?

    Currently priced at $618, Scandinavian Airlines will fly you from Porto to Chicago and back. In addition to Scandinavian Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from British Airways and United Airlines - these airlines can fly you to your destination from $669 and $697, respectively. These flights start at 26% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Porto to Chicago one-way?

    For one-way options, check prices for TAP AIR PORTUGAL. According to our data, you can fly for as low as $526. Users have also found prices from $558 and $745 on Turkish Airlines and British Airways, respectively.

  • 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.

  • What is the cheapest month to book a flight from Porto to Chicago?

    Currently, August is the cheapest month in which you can book a flight from Porto to Chicago (average of $245). Flying from Porto to Chicago in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Merrillville
New Buffalo
Hammond
Benton Harbor
Porter
Lansing
Valparaiso
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
Porto to St. Louis flights
Faro to O'Hare Intl flights
Lisbon to St. Louis flights

Top airline flying from Porto to Chicago

Discover the top airline that operate flights from Porto to Chicago. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$846Average$879FlexibilityNo cancel feeOn-time69%
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.