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$303+ 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 3/18. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — OPO
Jan 7 — Jan 141
Wed 1/7
Wed 1/14
1 adult, Economy
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Find cheap flights from Chicago to Porto with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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3. Compare prices and book

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Cheapflights Tip: The best prices from Chicago to Porto are usually found in April or February, booked 16 days in advance, depart on a Monday or Sunday and return on a Wednesday

Cheap 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 December 8, 2025.

This United Airlines deal was found by Cheapflights users on 12/8. 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.
Tue 12/307:00 amORD - OPO
2 stops22h 40mUnited Airlines
Thu 1/86:00 amOPO - ORD
2 stops42h 37mUnited Airlines
Deal found 12/8$641
This KLM deal was found by Cheapflights users on 12/8. 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 12/294:25 pmORD - OPO
1 stop20h 15mKLM
Thu 1/811:15 amOPO - ORD
1 stop33h 05mKLM
Deal found 12/8$738
This KLM deal was found by Cheapflights users on 12/8. 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.
Tue 12/305:20 pmORD - OPO
1 stop11h 10mKLM
Thu 1/811:15 amOPO - ORD
1 stop33h 05mKLM
Deal found 12/8$807
This United Airlines deal was found by Cheapflights users on 12/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:51 amORD - OPO
2 stops20h 49mUnited Airlines
Fri 1/96:00 amOPO - ORD
2 stops36h 10mUnited Airlines
Deal found 12/7$808
This Expedia deal was found by Cheapflights users on 12/7. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/115:40 pmORD - OPO
1 stop32h 00mIberia
Tue 2/248:20 amOPO - ORD
1 stop12h 35mIberia
Deal found 12/7$853
This Mytrip deal was found by Cheapflights users on 12/5. 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 12/123:55 pmORD - OPO
2 stops13h 20mMultiple Airlines
Mon 12/156:30 amOPO - ORD
2 stops17h 55mMultiple Airlines
Deal found 12/5$859
This KAYAK deal was found by Cheapflights users on 12/7. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/113:45 pmORD - OPO
2 stops20h 45mSWISS
Tue 2/2411:25 amOPO - ORD
1 stop31h 20mSWISS
Deal found 12/7$864
This Expedia deal was found by Cheapflights users on 12/7. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/113:45 pmORD - OPO
2 stops20h 45mMultiple Airlines
Tue 2/247:25 pmOPO - ORD
2 stops30h 20mMultiple Airlines
Deal found 12/7$871
This KLM deal was found by Cheapflights users on 12/6. 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.
Wed 12/244:25 pmORD - OPO
1 stop20h 55mKLM
Mon 12/296:30 amOPO - ORD
1 stop13h 50mKLM
Deal found 12/6$934
This Delta deal was found by Cheapflights users on 12/7. 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.
Tue 12/3011:48 amMDW - OPO
2 stops16h 42mDelta
Fri 1/96:30 amOPO - MDW
2 stops18h 02mDelta
Deal found 12/7$1,382
This Kiwi.com deal was found by Cheapflights users on 12/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/212:16 pmMDW - OPO
2 stops21h 34mMultiple Airlines
Sat 12/278:50 amOPO - MDW
1 stop31h 15mMultiple Airlines
Deal found 12/6$1,482
This Kiwi.com deal was found by Cheapflights users on 12/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2010:18 amMDW - OPO
2 stops24h 22mMultiple Airlines
Sat 12/278:50 amOPO - MDW
1 stop31h 15mMultiple Airlines
Deal found 12/6$1,675

Find 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 December 8, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$428
(oojo)

One-way from

$303
(Kiwi.com)

Popular in

July

Cheapest in

April

Average price

$749
Provider with most accurate pricing for Chicago (CHI)-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Porto flights.
Search Deals
From Chicago (CHI) to Porto
Search Deals
One-way flight from Chicago (CHI) to Porto
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($110 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 8, 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 2/4

3:35 pm-1:15 pm

2 stops15h 40m

Porto

Wed 2/11

6:00 am-1:25 pm

1 stop13h 25m

$482

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 1/13

1:55 pm-10:30 am

2 stops14h 35m

Porto

Tue 1/27

11:15 am-2:20 pm

1 stop33h 05m

$482

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 2/9

5:20 pm-10:30 am

1 stop11h 10m

Porto

Mon 2/16

11:15 am-8:44 pm

2 stops39h 29m

$488

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 1/21

2:25 pm-3:25 pm

2 stops19h 00m

Porto

Wed 1/28

5:00 am-2:20 pm

1 stop15h 20m

$488

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 2/4

3:35 pm-1:15 pm

2 stops15h 40m

Porto

Wed 2/11

6:00 am-7:45 pm

2 stops19h 45m

$489

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 1/26

1:58 pm-10:30 am

2 stops14h 32m

Porto

Fri 2/6

5:00 am-4:55 pm

2 stops17h 55m

$492

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 2/8

7:01 am-10:30 am

2 stops21h 29m

Porto

Mon 2/16

11:15 am-8:44 pm

2 stops39h 29m

$492

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 2/4

1:31 pm-10:30 am

2 stops14h 59m

Porto

Wed 2/11

4:10 pm-5:37 pm

2 stops31h 27m

$492

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 2/10

7:00 am-10:30 am

2 stops21h 30m

Porto

Mon 2/16

11:15 am-4:41 pm

2 stops35h 26m

$492

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 1/21

1:29 pm-10:30 am

2 stops15h 01m

Porto

Wed 1/28

5:00 am-5:29 pm

2 stops18h 29m

$492

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/6

Showing 1-10 of 34 results
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Compare providers for flights from Chicago to Porto

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Chicago to Porto in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Chicago-Porto flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Chicago-Porto flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Chicago-Porto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Chicago-Porto flights, Cheapflights users trust eDreams the most. eDreams 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 Chicago-Porto 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 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 December 5, 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 16 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, November is the cheapest month in which you can book a flight from Chicago to Porto (average of $449). Flying from Chicago to Porto in June is currently the most expensive (average of $691). 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 December 8, 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 36% on your trip compared to booking a flight in the afternoon.

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?

How often are flights from Chicago to Porto delayed?

About 100% of weekly flights between Chicago and Porto have experienced delays in the past year, with the average delay time being 319 minutes.

What is the most punctual flight time for Chicago to Porto flights?

Historically, flights departing at night are less likely to be delayed, whereas flights leaving at night tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Sunday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Chicago to Porto flights?

Over the last year, United Airlines have had the lowest number of delays on this route, with just 100% of flights being delayed.

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 December 8, 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
7.9
Good
8,011 reviews

Overall

7.9

Entertainment

7.9

Crew

8.5

Boarding

8.1

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,011 reviews
Delta
7.9
Good
8,011 reviews

Overall

7.9

Entertainment

7.9

Crew

8.5

Boarding

8.1

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,078 reviews
Delta
7.9
Good
8,011 reviews

Overall

7.9

Entertainment

7.9

Crew

8.5

Boarding

8.1

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
TAP AIR PORTUGAL
7.2
Good
2,083 reviews
Delta
7.9
Good
8,011 reviews

Overall

7.9

Entertainment

7.9

Crew

8.5

Boarding

8.1

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Iberia
7.0
Good
3,042 reviews
Delta
7.9
Good
8,011 reviews

Overall

7.9

Entertainment

7.9

Crew

8.5

Boarding

8.1

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Lufthansa
6.8
Okay
7,616 reviews
Delta
7.9
Good
8,011 reviews

Overall

7.9

Entertainment

7.9

Crew

8.5

Boarding

8.1

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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 KLM, Delta, and Air Canada fly from Chicago to Porto in about 11h 10m. The time it takes to get you to your destination can typically vary by up to 4h 30m. 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 $480, 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.

  • 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 ($323), United Airlines ($420), and Scandinavian Airlines ($421).

  • 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 $16 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, November is the cheapest month in which you can book a flight from Chicago to Porto (average of $449). Flying from Chicago to Porto in June is currently the most expensive (average of $691). 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
Vila Nova de Gaia

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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 December 8, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$480Average$713FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$488Average$732FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$504Average$736FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$526Average$613FlexibilityNo cancel feeOn-time76%
KLMCheapest$531Average$681FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$544Average$721FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$553Average$719FlexibilityNo cancel feeOn-time71%
SWISSCheapest$558Average$725FlexibilityNo cancel feeOn-time79%
DeltaCheapest$638Average$841FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$646Average$713FlexibilityNo cancel feeOn-time67%

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