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$264+ 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 9/28. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — OPO
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to Porto are usually found in January or April, 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 September 17, 2025.

Round-trip from

$429
(Mytrip)

One-way from

$264
(Booking.com)

Popular in

July

Cheapest in

January

Average price

$670
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. 14% potential increase in price ($115 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 17, 2025.

This Mytrip deal was found by Cheapflights users on 9/17. 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.
Wed 11/57:15 amORD - OPO
2 stops22h 00mMultiple Airlines
Wed 11/1212:10 pmOPO - ORD
1 stop34h 10mMultiple Airlines
Deal found 9/17$429
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2712:00 pmORD - OPO
1 stop16h 30mUnited Airlines
Wed 11/1212:35 pmOPO - ORD
1 stop14h 41mUnited Airlines
Deal found 9/15$436
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/275:45 pmORD - OPO
1 stop17h 15mAmerican Airlines
Wed 11/128:20 amOPO - ORD
1 stop12h 10mAmerican Airlines
Deal found 9/15$446
This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Wed 11/56:50 pmORD - OPO
1 stop17h 45mSWISS
Wed 11/1212:10 pmOPO - ORD
1 stop34h 10mSWISS
Deal found 9/17$450
This oojo deal was found by Cheapflights users on 9/16. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/256:50 pmORD - OPO
1 stop34h 25mSWISS
Tue 12/212:05 pmOPO - ORD
1 stop34h 15mSWISS
Deal found 9/16$453
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/264:20 pmORD - OPO
1 stop11h 10mUnited Airlines
Tue 12/26:00 amOPO - ORD
1 stop13h 10mUnited Airlines
Deal found 9/15$458
This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Wed 10/297:50 pmORD - OPO
1 stop17h 45mSWISS
Sun 11/96:35 pmOPO - ORD
2 stops51h 45mSWISS
Deal found 9/17$462
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/109:50 pmORD - OPO
1 stop19h 50mLufthansa
Fri 12/1912:30 pmOPO - ORD
1 stop13h 35mLufthansa
Deal found 9/15$467
This oojo deal was found by Cheapflights users on 9/15. 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.
Sun 11/27:20 pmORD - OPO
1 stop15h 25mScandinavian Airlines
Fri 11/75:35 pmOPO - ORD
1 stop29h 10mScandinavian Airlines
Deal found 9/15$470
This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Wed 10/2910:50 pmORD - OPO
1 stop19h 50mMultiple Airlines
Sun 11/97:25 pmOPO - ORD
1 stop26h 55mMultiple Airlines
Deal found 9/17$474
This Air France deal was found by Cheapflights users on 9/15. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/251:47 pmMDW - OPO
2 stops14h 43mMultiple Airlines
Tue 12/26:05 amOPO - MDW
2 stops17h 55mMultiple Airlines
Deal found 9/15$479
This Delta deal was found by Cheapflights users on 9/17. 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.
Wed 11/510:40 amMDW - OPO
2 stops17h 50mDelta
Wed 11/1211:15 amOPO - MDW
2 stops18h 17mDelta
Deal found 9/17$492

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 September 17, 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

Wed 11/5

7:15 am-11:15 am

2 stops22h 00m

Porto

Wed 11/12

12:10 pm-4:20 pm

1 stop34h 10m

$429

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 10/27

9:15 am-9:30 am

1 stop19h 15m

Porto

Wed 11/12

12:35 pm-11:43 pm

2 stops17h 08m

$436

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/26

2:30 pm-9:30 am

1 stop13h 00m

Porto

Tue 12/2

6:00 am-1:10 pm

1 stop13h 10m

$450

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 11/25

12:45 pm-9:30 am

2 stops14h 45m

Porto

Tue 12/2

6:00 am-1:10 pm

1 stop13h 10m

$462

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 10/27

1:25 pm-10:30 am

2 stops16h 05m

Porto

Wed 11/12

6:00 am-5:45 pm

2 stops17h 45m

$479

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Tue 11/25

1:47 pm-10:30 am

2 stops14h 43m

Porto

Tue 12/2

6:05 am-6:00 pm

2 stops17h 55m

$479

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Mon 10/27

1:08 pm-10:30 am

2 stops16h 22m

Porto

Wed 11/12

11:15 am-11:32 pm

2 stops18h 17m

$479

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 11/26

10:47 am-10:30 am

2 stops17h 43m

Porto

Tue 12/2

6:05 am-6:00 pm

2 stops17h 55m

$479

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/26

1:25 pm-10:30 am

2 stops15h 05m

Porto

Tue 12/2

4:10 pm-2:20 pm

1 stop28h 10m

$482

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 11/5

10:40 am-10:30 am

2 stops17h 50m

Porto

Wed 11/12

11:15 am-11:32 pm

2 stops18h 17m

$492

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 31 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 September 12, 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 $1,028). 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 September 17, 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 September 17, 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
7,961 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

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
7,961 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

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
8,926 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

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
1,977 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

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
2,925 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

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
7,409 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

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 United Airlines and Delta fly from Chicago to Porto in about 16h 22m. The time it takes to get you to your destination can typically vary by up to 2h 53m. 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 $453, 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 36% 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 $19 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 $1,028). 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

Browse thousands of different options on Cheapflights for your next trip

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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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$453Average$672FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$472Average$715FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$504Average$736FlexibilityNo cancel feeOn-time70%
KLMCheapest$525Average$698FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$553Average$656FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$553Average$727FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$554Average$724FlexibilityNo cancel feeOn-time71%
SWISSCheapest$558Average$756FlexibilityNo cancel feeOn-time79%
DeltaCheapest$639Average$841FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$646Average$732FlexibilityNo cancel feeOn-time67%

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