HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Chicago

$391+ 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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — CHI
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
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 July 30, 2025.

Round-trip from

$542
(lol.travel)

One-way from

$391
(Kiwi.com)

Popular in

July

Cheapest in

March

Average price

$1,103
From Porto to Chicago (CHI)
Search Deals
One-way flight from Porto to Chicago (CHI)
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($164 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 July 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 July 30, 2025.

This lol.travel deal was found by Cheapflights users on 7/30. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/189:15 pmOPO - ORD
1 stop25h 15mTAP AIR PORTUGAL
Thu 10/26:00 pmORD - OPO
1 stop17h 00mTAP AIR PORTUGAL
Deal found 7/30$542
This Mytrip deal was found by Cheapflights users on 7/30. 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.
Thu 8/284:55 pmOPO - ORD
2 stops29h 15mMultiple Airlines
Sun 9/286:00 pmORD - OPO
2 stops22h 35mMultiple Airlines
Deal found 7/30$674
This Delta deal was found by Cheapflights users on 7/30. 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.
Thu 9/186:30 amOPO - ORD
1 stop13h 40mDelta
Thu 10/26:28 pmORD - OPO
2 stops15h 02mDelta
Deal found 7/30$677
This KLM deal was found by Cheapflights users on 7/29. 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.
Thu 9/186:30 amOPO - ORD
1 stop13h 40mKLM
Thu 10/25:10 pmORD - OPO
1 stop16h 20mKLM
Deal found 7/29$683
This Iberia deal was found by Cheapflights users on 7/30. 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.
Wed 8/278:15 amOPO - ORD
1 stop12h 00mIberia
Fri 9/264:30 pmORD - OPO
1 stop21h 25mIberia
Deal found 7/30$687
This American Airlines deal was found by Cheapflights users on 7/29. 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 9/188:15 amOPO - ORD
1 stop12h 00mAmerican Airlines
Thu 10/24:30 pmORD - OPO
1 stop13h 10mAmerican Airlines
Deal found 7/29$692
This lol.travel deal was found by Cheapflights users on 7/30. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/225:55 pmOPO - ORD
1 stop28h 15mScandinavian Airlines
Mon 8/257:15 pmORD - OPO
1 stop33h 45mScandinavian Airlines
Deal found 7/30$795
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Mon 10/2712:35 pmOPO - ORD
2 stops16h 08mUnited Airlines
Mon 11/32:00 pmORD - OPO
2 stops13h 30mUnited Airlines
Deal found 7/30$812
This Turkish Airlines deal was found by Cheapflights users on 7/30. 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.
Mon 10/274:10 pmOPO - ORD
1 stop23h 55mTurkish Airlines
Sat 11/112:50 pmORD - OPO
1 stop21h 20mTurkish Airlines
Deal found 7/30$852
This British Airways deal was found by Cheapflights users on 7/29. 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.
Thu 9/188:15 amOPO - ORD
2 stops17h 18mBritish Airways
Thu 10/210:35 pmORD - OPO
1 stop15h 45mBritish Airways
Deal found 7/29$855
This SWISS deal was found by Cheapflights users on 7/29. 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.
Fri 9/128:40 amOPO - ORD
1 stop13h 15mSWISS
Fri 9/197:05 pmORD - OPO
2 stops36h 40mSWISS
Deal found 7/29$877

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 July 30, 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

Thu 9/18

9:15 pm-4:30 pm

1 stop25h 15m

Chicago O'Hare Intl

Thu 10/2

6:00 pm-5:00 pm

1 stop17h 00m

$542

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 11/21

11:30 am-4:45 pm

2 stops35h 15m

Chicago O'Hare Intl

Sat 11/29

7:20 pm-6:50 am

3 stops29h 30m

$598

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 9/18

6:30 am-2:10 pm

1 stop13h 40m

Chicago O'Hare Intl

Thu 10/2

6:28 pm-3:30 pm

2 stops15h 02m

$677

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 9/18

6:30 am-5:59 pm

2 stops17h 29m

Chicago O'Hare Intl

Thu 10/2

5:10 pm-3:30 pm

1 stop16h 20m

$688

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 9/18

8:15 am-2:15 pm

1 stop12h 00m

Chicago O'Hare Intl

Thu 10/2

4:30 pm-11:40 am

1 stop13h 10m

$692

PortoChicago

OPO - ORD

OPOORD

Porto

Sat 9/13

8:15 am-7:45 pm

2 stops17h 30m

Chicago O'Hare Intl

Sat 9/20

4:30 pm-11:40 am

1 stop13h 10m

$698

PortoChicago

OPO - ORD

OPOORD

Porto

Sat 12/13

7:50 pm-6:45 pm

1 stop28h 55m

Chicago O'Hare Intl

Tue 12/30

9:45 pm-5:35 pm

1 stop13h 50m

$716

PortoChicago

OPO - ORD

OPOORD

Porto

Wed 8/27

1:10 pm-12:50 pm

2 stops29h 40m

$391

PortoChicago

OPO - ORD

OPOORD

Porto

Wed 10/15

9:15 pm-12:35 pm

1 stop21h 20m

$475

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 9/1

10:55 am-9:40 am

1 stop28h 45m

$621

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 12 results
1
2

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

How much does it cost to fly round-trip from Porto to Chicago?

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 July 30, 2025.
Peruse reviews from past customers who have flown with Delta, KLM, and Austrian Airlines from Porto to Chicago to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,980 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very good
7,980 reviews
Delta
8.0
Very good
7,980 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,980 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Austrian Airlines
7.6
Good
823 reviews
Delta
8.0
Very good
7,980 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
SWISS
7.5
Good
1,686 reviews
Delta
8.0
Very good
7,980 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
United Airlines
7.4
Good
8,896 reviews
Delta
8.0
Very good
7,980 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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.

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

    Currently priced at $542, TAP AIR PORTUGAL will fly you from Porto to Chicago and back. In addition to TAP AIR PORTUGAL, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and KLM - these airlines can fly you to your destination from $677 and $688, respectively. These flights start at 33% lower than the current average price 3 months from now.

  • 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 Chicago?

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