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$441+ 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 10/4. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — CHI
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
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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 April 17, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
2 stars

Round-trip from

$685
(Iberia)

One-way from

$441
(Kiwi.com)

Popular in

July

Cheapest in

March

Average price

$682
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. 13% potential increase in price ($128 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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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 April 17, 2025.

This Iberia deal was found by Cheapflights users on 4/17. 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.
Thu 5/228:15 amOPO - ORD
1 stop12h 00mMultiple Airlines
Thu 6/55:00 pmORD - OPO
1 stop21h 20mMultiple Airlines
Deal found 4/17$685
This Delta deal was found by Cheapflights users on 4/17. 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 9/2510:10 amORD - OPO
2 stops16h 15mDelta
Deal found 4/17$690
This KLM deal was found by Cheapflights users on 4/17. 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 9/254:20 pmORD - OPO
1 stop23h 55mKLM
Deal found 4/17$695
This Mytrip deal was found by Cheapflights users on 4/17. 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.
Sat 5/36:15 amOPO - ORD
2 stops32h 35mAir Canada
Sun 5/119:35 amORD - OPO
2 stops26h 40mAir Canada
Deal found 4/17$702
This United Airlines deal was found by Cheapflights users on 4/17. 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.
Fri 6/136:00 amOPO - ORD
1 stop12h 55mUnited Airlines
Mon 6/2312:05 pmORD - OPO
1 stop12h 50mUnited Airlines
Deal found 4/17$753
This Lufthansa deal was found by Cheapflights users on 4/17. 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 10/276:00 amOPO - ORD
1 stop13h 25mLufthansa
Mon 12/296:25 pmORD - OPO
1 stop22h 00mLufthansa
Deal found 4/17$774
This AirNGo deal was found by Cheapflights users on 4/17. 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1010:35 pmOPO - ORD
1 stop23h 55mTAP AIR PORTUGAL
Fri 10/176:00 pmORD - OPO
1 stop24h 40mTAP AIR PORTUGAL
Deal found 4/17$803
This American Airlines deal was found by Cheapflights users on 4/17. 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 10/108:15 amOPO - ORD
2 stops17h 14mAmerican Airlines
Fri 10/174:30 pmORD - OPO
1 stop13h 10mAmerican Airlines
Deal found 4/17$838
This Cheapflightsfares deal was found by Cheapflights users on 4/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/278:20 amOPO - ORD
2 stops17h 55mIberia
Mon 12/298:45 pmORD - OPO
2 stops17h 15mIberia
Deal found 4/17$854

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 April 17, 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 5/22

8:15 am-2:15 pm

1 stop12h 00m

Chicago O'Hare Intl

Thu 6/5

5:00 pm-8:20 pm

1 stop21h 20m

$685

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 9/18

6:30 am-2:10 pm

1 stop13h 40m

Chicago O'Hare Intl

Thu 9/25

10:10 am-8:25 am

2 stops16h 15m

$690

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 9/18

6:30 am-2:10 pm

1 stop13h 40m

Chicago O'Hare Intl

Thu 9/25

4:20 pm-10:15 pm

1 stop23h 55m

$695

PortoChicago

OPO - ORD

OPOORD

Porto

Sat 5/3

6:15 am-8:50 am

2 stops32h 35m

Chicago O'Hare Intl

Sun 5/11

9:35 am-6:15 pm

2 stops26h 40m

$702

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 6/13

6:00 am-12:55 pm

1 stop12h 55m

Chicago O'Hare Intl

Mon 6/23

12:05 pm-6:55 am

1 stop12h 50m

$753

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 10/10

10:35 pm-4:30 pm

1 stop23h 55m

Chicago O'Hare Intl

Fri 10/17

6:00 pm-12:40 am

1 stop24h 40m

$803

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 10/10

8:15 am-7:29 pm

2 stops17h 14m

Chicago O'Hare Intl

Fri 10/17

4:30 pm-11:40 am

1 stop13h 10m

$838

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 5/22

8:15 am-2:15 pm

1 stop12h 00m

Chicago O'Hare Intl

Thu 6/5

3:19 pm-11:40 am

2 stops14h 21m

$924

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 5/1

6:00 am-7:55 pm

1 stop19h 55m

Chicago O'Hare Intl

Fri 5/16

5:50 pm-11:20 pm

1 stop23h 30m

$930

PortoChicago

OPO - ORD

OPOORD

Porto

Sat 10/4

10:20 pm-11:10 pm

3 stops30h 50m

$441

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 18 results
1
2
  • 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

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 April 17, 2025.
Delta
8.0
Very good
7,917 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.3

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
7,917 reviews
Delta
8.0
Very good
7,917 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.3

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
1,329 reviews
Delta
8.0
Very good
7,917 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.3

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
1,580 reviews
Delta
8.0
Very good
7,917 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.3

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
8,667 reviews
Delta
8.0
Very good
7,917 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.3

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
3,769 reviews
Delta
8.0
Very good
7,917 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.3

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 0 different airlines.

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

    Currently priced at $690, Delta will fly you from Porto to Chicago and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from KLM and Air Canada - these airlines can fly you to your destination from $695 and $702, respectively. These flights start at 13% 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 Turkish Airlines. According to our data, you can fly for as low as $604. Users have also found prices from $621 and $671 on TAP AIR PORTUGAL and Iberia, 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
Hammond
Benton Harbor
Porter
Lansing
Valparaiso
Chesterton

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