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$242+ 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 10/18. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — OPO
août 23 — août 301
sam. 8/23
sam. 8/30
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to Porto are usually found in February or January, booked 55 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 août 18, 2025.

Round-trip from

$469
(oojo)

One-way from

$242
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$739
From Chicago (CHI) to Porto
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One-way flight from Chicago (CHI) to Porto
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Highest demand for flights based on searches. 15% potential increase in price ($131 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($17 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 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 août 18, 2025.

This oojo deal was found by Cheapflights users on 8/18. 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.
dim. 11/237:20 pmORD - OPO
1 stop15h 25mScandinavian Airlines
ven. 11/285:45 pmOPO - ORD
1 stop29h 00mScandinavian Airlines
Deal found 8/18$469
This oojo deal was found by Cheapflights users on 8/15. 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.
ven. 10/176:00 pmORD - OPO
1 stop10h 35mTAP AIR PORTUGAL
mar. 10/288:00 pmOPO - ORD
1 stop25h 00mTAP AIR PORTUGAL
Deal found 8/15$487
This Flightnetwork deal was found by Cheapflights users on 8/17. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 9/286:00 pmORD - OPO
1 stop15h 20mTAP AIR PORTUGAL
mar. 10/1410:30 pmOPO - ORD
1 stop23h 40mTAP AIR PORTUGAL
Deal found 8/17$489
This United Airlines deal was found by Cheapflights users on 8/16. 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.
mar. 11/114:20 pmORD - OPO
1 stop11h 10mUnited Airlines
mar. 11/1812:35 pmOPO - ORD
1 stop14h 41mUnited Airlines
Deal found 8/16$498
This FlightHub deal was found by Cheapflights users on 8/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 9/286:00 pmORD - OPO
1 stop17h 00mTAP AIR PORTUGAL
mer. 10/89:15 pmOPO - ORD
1 stop21h 20mTAP AIR PORTUGAL
Deal found 8/17$500
This Kiwi.com deal was found by Cheapflights users on 8/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 10/297:50 pmORD - OPO
1 stop17h 45mSWISS
dim. 11/96:35 pmOPO - ORD
2 stops51h 45mSWISS
Deal found 8/18$518
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/296:10 pmORD - OPO
1 stop14h 50mTAP AIR PORTUGAL
mer. 10/810:25 pmOPO - ORD
1 stop20h 10mTAP AIR PORTUGAL
Deal found 8/17$529
This United deal was found by Cheapflights users on 8/18. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 10/296:25 pmORD - OPO
1 stop10h 05mMultiple Airlines
dim. 11/96:00 amOPO - ORD
1 stop20h 05mMultiple Airlines
Deal found 8/18$535
This oojo deal was found by Cheapflights users on 8/17. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 10/166:00 pmORD - OPO
1 stop18h 55mTAP AIR PORTUGAL
sam. 10/259:00 amOPO - ORD
1 stop13h 30mTAP AIR PORTUGAL
Deal found 8/17$536
This United Airlines deal was found by Cheapflights users on 8/17. 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.
mer. 10/292:00 pmORD - OPO
2 stops14h 30mUnited Airlines
dim. 11/96:00 amOPO - ORD
1 stop13h 10mUnited Airlines
Deal found 8/17$539
This FlightHub deal was found by Cheapflights users on 8/16. 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.
jeu. 11/207:20 pmORD - OPO
1 stop15h 35mScandinavian Airlines
ven. 11/285:45 pmOPO - ORD
1 stop29h 00mScandinavian Airlines
Deal found 8/16$548
This Delta deal was found by Cheapflights users on 8/15. 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.
mer. 12/39:30 amMDW - OPO
2 stops19h 00mDelta
dim. 12/711:15 amOPO - MDW
2 stops37h 21mDelta
Deal found 8/15$727

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 août 18, 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

ven. 10/17

6:00 pm-10:35 am

1 stop10h 35m

Porto

mar. 10/28

8:00 pm-4:00 pm

1 stop25h 00m

$487

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

dim. 9/28

6:00 pm-3:20 pm

1 stop15h 20m

Porto

mar. 10/14

10:30 pm-4:10 pm

1 stop23h 40m

$489

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mar. 11/11

4:20 pm-9:30 am

1 stop11h 10m

Porto

mar. 11/18

12:35 pm-9:16 pm

1 stop14h 41m

$498

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

dim. 9/28

6:00 pm-5:00 pm

1 stop17h 00m

Porto

mer. 10/8

9:15 pm-12:35 pm

1 stop21h 20m

$500

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mer. 10/29

7:50 pm-6:35 pm

1 stop17h 45m

Porto

dim. 11/9

6:35 pm-4:20 pm

2 stops51h 45m

$518

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

mer. 12/3

9:30 am-10:30 am

2 stops19h 00m

Porto

dim. 12/7

11:15 am-6:36 pm

2 stops37h 21m

$727

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

jeu. 11/13

1:00 pm-10:30 am

2 stops15h 30m

Porto

jeu. 11/20

6:35 am-6:36 pm

2 stops18h 01m

$727

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

jeu. 11/20

9:30 am-10:30 am

2 stops19h 00m

Porto

ven. 11/28

6:30 am-6:07 pm

2 stops17h 37m

$766

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

lun. 9/29

6:15 pm-3:30 pm

2 stops15h 15m

Porto

mar. 10/7

6:15 am-6:25 pm

2 stops18h 10m

$766

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

mer. 9/3

10:31 am-10:40 am

2 stops18h 09m

Porto

jeu. 9/18

6:30 am-6:35 pm

2 stops18h 05m

$784

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/16

Showing 1-10 of 35 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 August 8, 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 55 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 $1,030). 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 août 18, 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.

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 août 18, 2025.
See what other customers who have flown with Delta, United Airlines, and TAP AIR PORTUGAL 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
7,981 reviews

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

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
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

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
8,925 reviews
Delta
8.0
Very good
7,981 reviews

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

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!
TAP AIR PORTUGAL
7.1
Good
1,954 reviews
Delta
8.0
Very good
7,981 reviews

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

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!
Iberia
7.0
Good
2,884 reviews
Delta
8.0
Very good
7,981 reviews

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

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!
Lufthansa
6.8
Okay
7,330 reviews
Delta
8.0
Very good
7,981 reviews

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Comfort

7.9

Crew

8.5

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.

  • How long is the flight from Chicago to Porto?

    Airlines like TAP AIR PORTUGAL, United Airlines, and Delta fly from Chicago to Porto in about 10h 35m. The time it takes to get you to your destination can typically vary by up to 8h 25m. The distance from Chicago to Porto is about 3931 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    TAP AIR PORTUGAL, at $464, was found to be the cheapest airline from Chicago to Porto.Alternate airlines to your destination round-trip include Iberia and British Airways. TAP AIR PORTUGAL is 32% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 $32 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 $1,030). 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
Aveiro
Arcos de Valdevez
Coimbra

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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 août 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$464Average$675FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$474Average$705FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$504Average$736FlexibilityNo cancel feeOn-time70%
KLMCheapest$549Average$742FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$554Average$759FlexibilityNo cancel feeOn-time71%
LufthansaCheapest$555Average$685FlexibilityNo cancel feeOn-time76%
SWISSCheapest$558Average$725FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$560Average$731FlexibilityNo cancel feeOn-time69%
DeltaCheapest$626Average$734FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$646Average$732FlexibilityNo cancel feeOn-time67%

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