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$314+ 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 3/5. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — CHI
Jan 4 — Jan 111
Sun 1/4
Sun 1/11
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 December 5, 2025.

This American Airlines deal was found by Cheapflights users on 12/3. 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.
Sat 12/68:40 pmOPO - ORD
2 stops26h 20mAmerican Airlines
Mon 12/155:40 pmORD - OPO
1 stop12h 05mAmerican Airlines
Deal found 12/3$850
This American Airlines deal was found by Cheapflights users on 12/3. 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.
Sat 12/68:40 pmOPO - ORD
2 stops26h 20mAmerican Airlines
Sun 12/1410:07 amORD - OPO
2 stops19h 38mAmerican Airlines
Deal found 12/3$861
This American Airlines deal was found by Cheapflights users on 12/3. 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.
Fri 12/58:20 amOPO - ORD
1 stop12h 35mAmerican Airlines
Mon 12/155:40 pmORD - OPO
1 stop12h 05mAmerican Airlines
Deal found 12/3$903

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 December 5, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$559
(lol.travel)

One-way from

$314
(Kiwi.com)

Popular in

September

Cheapest in

February

Average price

$904
Provider with most accurate pricing for Porto-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Porto-Chicago (CHI) flights.
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From Porto to Chicago (CHI)
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One-way flight from Porto to Chicago (CHI)
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Highest demand for flights based on searches. 11% potential increase in price ($117 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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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 December 5, 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

Sun 1/18

5:00 am-2:45 pm

1 stop15h 45m

Chicago O'Hare Intl

Sun 1/25

8:25 pm-5:00 pm

1 stop14h 35m

$559

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 1/15

6:00 pm-3:25 pm

1 stop27h 25m

Chicago O'Hare Intl

Fri 1/30

8:15 pm-7:00 pm

1 stop16h 45m

$572

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 1/15

11:15 am-3:25 pm

1 stop34h 10m

Chicago O'Hare Intl

Wed 1/28

7:10 pm-9:55 am

1 stop32h 45m

$583

PortoChicago

OPO - ORD

OPOORD

Porto

Sun 1/18

6:00 am-7:45 pm

2 stops19h 45m

Chicago O'Hare Intl

Sun 1/25

8:00 am-11:40 am

2 stops21h 40m

$652

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 4/20

6:00 am-7:55 pm

1 stop19h 55m

Chicago O'Hare Intl

Mon 4/27

3:35 pm-10:20 am

1 stop12h 45m

$716

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 1/15

6:00 am-9:13 am

2 stops33h 13m

Chicago O'Hare Intl

Fri 1/30

4:20 pm-11:40 am

1 stop13h 20m

$716

PortoChicago

OPO - ORD

OPOORD

Porto

Sat 1/17

6:00 am-11:39 pm

2 stops23h 39m

Chicago O'Hare Intl

Sat 1/24

3:20 pm-11:40 am

1 stop14h 20m

$721

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 3/5

9:55 pm-12:01 am

3 stops56h 06m

$360

PortoChicago

OPO - ORD

OPOORD

Porto

Wed 2/18

9:55 am-1:50 pm

2 stops33h 55m

$373

PortoChicago

OPO - ORD

OPOORD

Porto

Tue 5/12

8:15 pm-2:15 pm

2 stops24h 00m

$387

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

Showing 1-10 of 13 results
1
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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 December.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Porto-Chicago flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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?

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?

    TAP AIR PORTUGAL can get you from Porto to Chicago in just under 15h 45m. 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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