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$384+ 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 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — CHI
Aug 12 — Aug 191
Tue 8/12
Tue 8/19
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 August 7, 2025.

Round-trip from

$581
(Mytrip)

One-way from

$384
(Kiwi.com)

Popular in

August

Cheapest in

March

Average price

$1,114
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. 18% potential increase in price ($185 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($30 potential savings vs. average RT price).
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Average for round-trip flights in August 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 August 7, 2025.

This Mytrip deal was found by Cheapflights users on 8/5. 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 9/611:00 amOPO - ORD
1 stop11h 30mTAP AIR PORTUGAL
Sat 9/206:15 pmORD - OPO
1 stop31h 50mTAP AIR PORTUGAL
Deal found 8/5$581
This AirNGo deal was found by Cheapflights users on 8/7. 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.
Thu 9/1110:25 pmOPO - ORD
1 stop23h 45mTAP AIR PORTUGAL
Thu 9/256:00 pmORD - OPO
1 stop23h 00mTAP AIR PORTUGAL
Deal found 8/7$585
This Mytrip deal was found by Cheapflights users on 8/5. 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 8/284:10 pmOPO - ORD
2 stops30h 00mMultiple Airlines
Sun 9/286:00 pmORD - OPO
2 stops22h 35mMultiple Airlines
Deal found 8/5$624
This Mytrip deal was found by Cheapflights users on 8/5. 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.
Fri 9/57:20 amOPO - ORD
3 stops31h 58mMultiple Airlines
Sun 9/216:00 pmORD - OPO
2 stops22h 35mMultiple Airlines
Deal found 8/5$658
This AirNGo deal was found by Cheapflights users on 8/5. 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 9/56:40 amOPO - ORD
1 stop13h 30mKLM
Sun 9/214:15 pmORD - OPO
1 stop12h 25mKLM
Deal found 8/5$673
This KLM deal was found by Cheapflights users on 8/5. 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.
Wed 8/278:10 pmOPO - ORD
1 stop24h 00mKLM
Fri 9/265:10 pmORD - OPO
1 stop16h 20mKLM
Deal found 8/5$678
This KLM deal was found by Cheapflights users on 8/7. 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.
Mon 11/246:30 amOPO - ORD
1 stop13h 50mKLM
Mon 12/15:20 pmORD - OPO
1 stop11h 10mKLM
Deal found 8/7$680
This Delta deal was found by Cheapflights users on 8/7. 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 9/116:30 amOPO - ORD
1 stop13h 40mDelta
Thu 9/257:25 amORD - OPO
2 stops19h 00mDelta
Deal found 8/7$681
This KLM deal was found by Cheapflights users on 8/6. 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.
Sat 9/207:00 pmOPO - ORD
1 stop25h 10mMultiple Airlines
Sat 9/276:28 pmORD - OPO
2 stops15h 02mMultiple Airlines
Deal found 8/6$683
This Delta deal was found by Cheapflights users on 8/5. 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.
Wed 8/276:15 amOPO - ORD
2 stops21h 39mDelta
Fri 9/262:05 pmORD - OPO
2 stops19h 25mDelta
Deal found 8/5$684

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 August 7, 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

Sat 9/6

11:00 am-4:30 pm

1 stop11h 30m

Chicago O'Hare Intl

Sat 9/20

6:15 pm-8:05 am

1 stop31h 50m

$581

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 9/11

10:25 pm-4:10 pm

1 stop23h 45m

Chicago O'Hare Intl

Thu 9/25

6:00 pm-11:00 pm

1 stop23h 00m

$585

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 8/28

4:10 pm-4:10 pm

2 stops30h 00m

Chicago O'Hare Intl

Sun 9/28

6:00 pm-10:35 pm

2 stops22h 35m

$624

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 9/5

7:20 am-9:18 am

3 stops31h 58m

Chicago O'Hare Intl

Sun 9/21

6:00 pm-10:35 pm

2 stops22h 35m

$658

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 9/5

6:40 am-2:10 pm

1 stop13h 30m

Chicago O'Hare Intl

Sun 9/21

4:15 pm-10:40 am

1 stop12h 25m

$673

PortoChicago

OPO - ORD

OPOORD

Porto

Wed 8/27

8:10 pm-2:10 pm

1 stop24h 00m

Chicago O'Hare Intl

Fri 9/26

5:10 pm-3:30 pm

1 stop16h 20m

$678

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 11/24

6:30 am-2:20 pm

1 stop13h 50m

Chicago O'Hare Intl

Mon 12/1

5:20 pm-10:30 am

1 stop11h 10m

$680

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 9/11

6:30 am-2:10 pm

1 stop13h 40m

Chicago O'Hare Intl

Thu 9/25

7:25 am-8:25 am

2 stops19h 00m

$681

PortoChicago

OPO - ORD

OPOORD

Porto

Sat 9/20

7:00 pm-2:10 pm

1 stop25h 10m

Chicago O'Hare Intl

Sat 9/27

6:28 pm-3:30 pm

2 stops15h 02m

$683

PortoChicago

OPO - ORD

OPOORD

Porto

Wed 8/27

6:15 am-9:54 pm

2 stops21h 39m

Chicago O'Hare Intl

Fri 9/26

2:05 pm-3:30 pm

2 stops19h 25m

$684

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/7

Showing 1-10 of 18 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 August 7, 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
7,987 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
6.0
Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others
Delta
8.0
Very good
7,987 reviews
Delta
8.0
Very good
7,987 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
6.0
Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others
KLM
7.8
Good
1,382 reviews
Delta
8.0
Very good
7,987 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
6.0
Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others
Austrian Airlines
7.6
Good
824 reviews
Delta
8.0
Very good
7,987 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
6.0
Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others
SWISS
7.6
Good
1,692 reviews
Delta
8.0
Very good
7,987 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
6.0
Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others
Scandinavian Airlines
7.4
Good
1,465 reviews
Delta
8.0
Very good
7,987 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
6.0
Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others

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 is the cheapest airline to fly from Porto to Chicago round-trip?

    Currently priced at $581, 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. This flight start at 28% 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

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