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$250+ Cheap flights from Chicago (CHI) to Porto (OPO)

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 10/19. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — OPO
Jul 10 — Jul 171
Khamis 7/10
Khamis 7/17
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to Porto are usually found in November or February, booked 75 days in advance, depart on a Monday or Sunday and return on a Wednesday

Cheap flight deals from Chicago to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) to Porto (OPO). 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 Julai 5, 2025.

Round-trip from

$616
(FlightHub)

One-way from

$260
(Kiwi.com)

Popular in

July

Cheapest in

November

Average price

$908
From Chicago (CHI) to Porto
Search Deals
One-way flight from Chicago (CHI) to Porto
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Highest demand for flights based on searches. 18% potential increase in price ($155 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Chicago to Porto

Cheapest flights from Chicago to Porto
Explore the most affordable flight options available from Chicago to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on Julai 5, 2025.

This FlightHub deal was found by Cheapflights users on 7/5. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sabtu 9/2711:45 pmORD - OPO
1 stop34h 05mTurkish Airlines
Sabtu 10/1110:45 amOPO - ORD
1 stop17h 15mTurkish Airlines
Deal found 7/5$616
This Mytrip deal was found by Cheapflights users on 7/4. 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.
Isnin 8/189:55 amORD - OPO
2 stops23h 10mMultiple Airlines
Isnin 8/259:20 amOPO - ORD
2 stops32h 50mMultiple Airlines
Deal found 7/4$617
This United Airlines deal was found by Cheapflights users on 7/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 8/278:40 amORD - OPO
1 stop18h 40mUnited Airlines
Khamis 9/46:00 amOPO - ORD
1 stop14h 55mUnited Airlines
Deal found 7/3$619
This Air Canada deal was found by Cheapflights users on 7/3. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Ahad 8/316:06 pmORD - OPO
2 stops33h 29mAir Canada
Selasa 9/912:50 pmOPO - ORD
1 stop32h 05mAir Canada
Deal found 7/3$622
This Delta deal was found by Cheapflights users on 7/2. 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.
Rabu 12/31:00 pmMDW - OPO
2 stops15h 30mDelta
Ahad 12/711:15 amOPO - MDW
2 stops37h 21mDelta
Deal found 7/2$622
This Delta deal was found by Cheapflights users on 7/5. 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.
Selasa 8/192:00 pmORD - OPO
2 stops19h 30mDelta
Selasa 8/266:15 amOPO - ORD
1 stop13h 55mDelta
Deal found 7/5$631
This SWISS deal was found by Cheapflights users on 7/4. 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.
Isnin 8/187:05 pmORD - OPO
2 stops16h 20mSWISS
Isnin 8/257:20 pmOPO - ORD
1 stop26h 35mSWISS
Deal found 7/4$632
This American Airlines deal was found by Cheapflights users on 7/3. 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.
Isnin 10/139:41 amORD - OPO
2 stops15h 54mAmerican Airlines
Selasa 11/118:20 amOPO - ORD
2 stops17h 25mAmerican Airlines
Deal found 7/3$637
This FlightHub deal was found by Cheapflights users on 7/3. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Ahad 8/3110:30 pmORD - OPO
1 stop18h 20mLufthansa
Selasa 9/96:00 amOPO - ORD
1 stop12h 55mLufthansa
Deal found 7/3$645
This Travelocity deal was found by Cheapflights users on 7/4. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sabtu 9/207:15 pmORD - OPO
2 stops21h 00mScandinavian Airlines
Jumaat 9/265:55 pmOPO - ORD
1 stop28h 15mScandinavian Airlines
Deal found 7/4$653
This Iberia deal was found by Cheapflights users on 7/3. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 9/104:30 pmORD - OPO
1 stop33h 05mIberia
Selasa 9/308:35 pmOPO - ORD
1 stop28h 15mIberia
Deal found 7/3$656
This oojo deal was found by Cheapflights users on 7/3. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Khamis 10/166:00 pmORD - OPO
1 stop18h 55mTAP AIR PORTUGAL
Ahad 10/266:55 amOPO - ORD
1 stop14h 05mTAP AIR PORTUGAL
Deal found 7/3$661

Cheapflights Fare Finder

Customize your flight search to find flights from Chicago to Porto 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 Julai 5, 2025.
Use the filters below to find and compare flights from Chicago to Porto that are best for you.

Fly from

Chicago

Fly to

Porto

Route

Depart

Return

Price

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sabtu 9/27

11:45 pm-3:50 pm

1 stop34h 05m

Porto

Sabtu 10/11

10:45 am-10:00 pm

1 stop17h 15m

$616

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Isnin 8/18

9:55 am-3:05 pm

2 stops23h 10m

Porto

Isnin 8/25

9:20 am-12:10 pm

2 stops32h 50m

$617

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Rabu 8/27

8:40 am-9:20 am

1 stop18h 40m

Porto

Khamis 9/4

6:00 am-2:55 pm

1 stop14h 55m

$619

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Ahad 8/31

6:06 pm-9:35 am

2 stops33h 29m

Porto

Selasa 9/9

12:50 pm-2:55 pm

1 stop32h 05m

$622

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Selasa 8/19

2:00 pm-3:30 pm

2 stops19h 30m

Porto

Selasa 8/26

6:15 am-2:10 pm

1 stop13h 55m

$631

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Isnin 8/18

7:05 pm-5:25 pm

2 stops16h 20m

Porto

Isnin 8/25

7:20 pm-3:55 pm

1 stop26h 35m

$632

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Isnin 10/13

9:41 am-7:35 am

2 stops15h 54m

Porto

Selasa 11/11

8:20 am-7:45 pm

2 stops17h 25m

$637

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Selasa 8/19

6:17 pm-3:30 pm

2 stops15h 13m

Porto

Selasa 8/26

6:15 am-6:37 pm

2 stops18h 22m

$641

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Ahad 8/31

10:30 pm-10:50 pm

1 stop18h 20m

Porto

Selasa 9/9

6:00 am-12:55 pm

1 stop12h 55m

$645

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sabtu 9/20

7:15 pm-10:15 pm

2 stops21h 00m

Porto

Jumaat 9/26

5:55 pm-4:10 pm

1 stop28h 15m

$653

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 27 results
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Best time to book a flight from Chicago to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Chicago 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 Chicago to Porto

How far ahead should I book a flight from Chicago to Porto?

Use this chart to determine the optimal time to book a round-trip flight from Chicago to Porto. Price data was last updated on June 27, 2025.

The price you pay for your flight from Chicago to Porto may vary depending on when you book. For the best chance of a lower fare, look to book 75 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Chicago to Porto?

Currently, January is the cheapest month in which you can book a flight from Chicago to Porto (average of $523). Flying from Chicago to Porto in June is currently the most expensive (average of $1,033). 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.

What is the cheapest time of day to fly from CHI to OPO?

Find hourly flight availability from Chicago to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated Julai 5, 2025.

A simple way to save on the total cost of your ticket is to fly from Chicago to Porto in the evening. If you’re flexible enough to do this you can expect to save up to 40% on your trip compared to booking a flight at noon.

What is the cheapest day to fly from Chicago to Porto?

Use this chart to determine the cheapest time to fly round-trip from Chicago to Porto. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Chicago to Porto flight should consider departing on Wednesday evenings when fares are most often at their lowest. Wednesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. 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 Porto. Reviews last updated Julai 5, 2025.
See what other customers who have flown with Delta, KLM, and Air France from Chicago to Porto have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,968 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,968 reviews
Delta
8.0
Very good
7,968 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,363 reviews
Delta
8.0
Very good
7,968 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air France
7.5
Good
1,465 reviews
Delta
8.0
Very good
7,968 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,649 reviews
Delta
8.0
Very good
7,968 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,851 reviews
Delta
8.0
Very good
7,968 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Chicago to Porto. 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 into for flights to Porto from Chicago?

    Porto (OPO), located 6.8 mi from the city center, is the airport you fly into when you book flights from Chicago to Porto. 10 airlines have flights to Porto from Chicago on a regular basis. Booking flights from Chicago to Porto should not be difficult; the airport handles an average of 0 inbound flights from Chicago per day.

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

    Turkish Airlines, at $616, was found to be the cheapest airline from Chicago to Porto.Alternate airlines to your destination round-trip include United Airlines and Air Canada. Turkish Airlines is 10% cheaper than the average price of flights available within the next 90 days to this destination.

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

    The cheapest airlines for a one-way flight from Chicago to Porto are TAP AIR PORTUGAL ($266), Air Canada ($358), and Delta ($385).

  • Where are the most common layover locations when flying from Chicago to Porto?

    Most of the time, Chicago to Porto flights that have layovers will stop in Lisbon.

  • What are some popular things to do or see while on a layover in Lisbon?

    Lisbon travelers tend to visit Chiado, Praça do Marquês de Pombal, and Londres more than anywhere else. Chiado, Praça do Marquês de Pombal, and Londres are located about 4.5 mi, 3.6 mi, and 2.3 mi, respectively from Lisbon Humberto Delgado. Those landing in Lisbon looking to spend some time exploring during their layover can rent a car for about $23 per day.

  • Where are the least popular layover locations for Chicago to Porto flights?

    Chicago to Porto flights have a layover in Madrid the least frequently.

  • Can I find deals for flights from Chicago to Porto that include hotel bookings?

    Yes. In addition to deals on Chicago to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Chicago to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to Porto.

  • Can I find deals for business class flights from Chicago to Porto?

    Yes. Cheapflights offers flight deals from Chicago to Porto 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 Chicago to Porto?

    Currently, January is the cheapest month in which you can book a flight from Chicago to Porto (average of $523). Flying from Chicago to Porto in June is currently the most expensive (average of $1,033). 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

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Top 10 airlines flying from Chicago to Porto

Discover the top 10 airlines that operate flights from Chicago to Porto. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated Julai 5, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$415Average$638FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$468Average$725FlexibilityNo cancel feeOn-time71%
IberiaCheapest$473Average$699FlexibilityNo cancel feeOn-time77%
DeltaCheapest$498Average$734FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$504Average$736FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$535Average$704FlexibilityNo cancel feeOn-time76%
SWISSCheapest$558Average$726FlexibilityNo cancel feeOn-time79%
KLMCheapest$563Average$758FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$568Average$779FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$646Average$732FlexibilityNo cancel feeOn-time67%

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