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$338+ 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 4/14. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — CHI
Feb 26 — Mar 51
Thu 2/26
Thu 3/5
1 adult, Economy
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Cheap 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 January 27, 2026.

This United Airlines deal was found by Cheapflights users on 1/26. 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.
Thu 2/126:00 am
OPO
-
ORD
1 stop13h 25m
United Airlines
Wed 2/252:30 pm
ORD
-
OPO
1 stop13h 00m
United Airlines
Deal found 1/26$458
This United Airlines deal was found by Cheapflights users on 1/26. 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.
Sat 2/146:00 am
OPO
-
ORD
1 stop15h 20m
United Airlines
Wed 2/184:05 pm
ORD
-
OPO
1 stop17h 20m
United Airlines
Deal found 1/26$459
This United Airlines deal was found by Cheapflights users on 1/25. 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 2/26:00 am
OPO
-
ORD
2 stops31h 47m
United Airlines
Sat 2/282:00 pm
ORD
-
OPO
2 stops13h 30m
United Airlines
Deal found 1/25$463
This Air Canada deal was found by Cheapflights users on 1/25. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/126:00 am
OPO
-
ORD
2 stops33h 13m
Multiple Airlines
Wed 2/252:00 pm
ORD
-
OPO
2 stops17h 15m
Multiple Airlines
Deal found 1/25$478
This Lufthansa deal was found by Cheapflights users on 1/25. 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.
Sun 2/221:45 pm
OPO
-
ORD
1 stop30h 25m
Lufthansa
Sat 2/283:20 pm
ORD
-
OPO
1 stop14h 20m
Lufthansa
Deal found 1/25$486
This United Airlines deal was found by Cheapflights users on 1/25. 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 2/2212:35 pm
OPO
-
ORD
2 stops27h 03m
United Airlines
Sat 2/281:02 pm
ORD
-
OPO
2 stops14h 28m
United Airlines
Deal found 1/25$487
This FlightHub deal was found by Cheapflights users on 1/25. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/146:00 am
OPO
-
ORD
1 stop15h 20m
Multiple Airlines
Wed 2/182:00 pm
ORD
-
OPO
2 stops19h 25m
Multiple Airlines
Deal found 1/25$488
This American Airlines deal was found by Cheapflights users on 1/26. 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.
Wed 2/48:20 am
OPO
-
ORD
2 stops36h 53m
American Airlines
Sun 2/86:25 pm
ORD
-
OPO
2 stops19h 35m
American Airlines
Deal found 1/26$493
This American Airlines deal was found by Cheapflights users on 1/26. 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 2/128:20 am
OPO
-
ORD
1 stop12h 35m
American Airlines
Wed 2/255:40 pm
ORD
-
OPO
1 stop16h 20m
American Airlines
Deal found 1/26$497
This American Airlines deal was found by Cheapflights users on 1/27. 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.
Tue 4/218:20 am
OPO
-
ORD
1 stop11h 55m
American Airlines
Tue 5/1211:21 am
ORD
-
OPO
2 stops14h 19m
American Airlines
Deal found 1/27$501

Find 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 January 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$458
(United Airlines)

One-way from

$338
(Kiwi.com)

Popular in

August

Cheapest in

January

Average price

$590
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. 25% potential increase in price ($286 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

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 January 27, 2026.
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 2/12

6:00 am-3:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Wed 2/25

2:00 pm-9:30 am

2 stops13h 30m

$458

PortoChicago

OPO - ORD

OPOORD

Porto

Sat 2/14

6:00 am-3:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Wed 2/18

4:05 pm-3:25 pm

1 stop17h 20m

$459

PortoChicago

OPO - ORD

OPOORD

Porto

Sun 2/22

1:45 pm-2:10 pm

1 stop30h 25m

Chicago O'Hare Intl

Sat 2/28

3:20 pm-11:40 am

1 stop14h 20m

$486

PortoChicago

OPO - ORD

OPOORD

Porto

Sun 2/22

12:35 pm-9:38 am

2 stops27h 03m

Chicago O'Hare Intl

Sat 2/28

1:02 pm-9:30 am

2 stops14h 28m

$487

PortoChicago

OPO - ORD

OPOORD

Porto

Sat 2/14

6:00 am-3:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Wed 2/18

2:00 pm-3:25 pm

2 stops19h 25m

$488

PortoChicago

OPO - ORD

OPOORD

Porto

Tue 4/14

10:00 pm-1:00 pm

2 stops45h 00m

$338

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 5/4

10:40 pm-1:00 pm

3 stops44h 20m

$356

PortoChicago

OPO - ORD

OPOORD

Porto

Sun 5/10

2:25 pm-1:00 pm

3 stops52h 35m

$424

PortoChicago

OPO - ORD

OPOORD

Porto

Sun 5/3

6:15 am-7:15 pm

2 stops43h 00m

$432

PortoChicago

OPO - ORD

OPOORD

Porto

Tue 4/21

8:15 pm-2:15 pm

2 stops24h 00m

$468

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

  • 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

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 January 27, 2026.
Peruse reviews from past customers who have flown with KLM 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.
KLM
7.7
Good
1,443 reviews

Overall

7.7

Comfort

7.6

Crew

8.4

Food

7.3

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
KLM
7.7
Good
1,443 reviews
KLM
7.7
Good
1,443 reviews

Overall

7.7

Comfort

7.6

Crew

8.4

Food

7.3

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.

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?

    United Airlines can get you from Porto to Chicago in just under 15h 20m. Your travel time can differ by up to . The distance between Porto and Chicago is about 3931 mi.

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

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $484. Users have also found prices from $484 and $505 on Iberia and TAP AIR PORTUGAL, 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.

See more FAQs

Traveling to a place near Chicago?

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

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