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$314+ 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 2/15. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — OPO
dic. 10 — dic. 171
mié. 12/10
mié. 12/17
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to Porto are usually found in April or February, booked 54 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 noviembre 10, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$425
(oojo)

One-way from

$314
(Kiwi.com)

Popular in

July

Cheapest in

April

Average price

$682
Provider with most accurate pricing for Chicago (CHI)-Porto flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Porto flights.
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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. 12% potential increase in price ($101 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in November 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 noviembre 10, 2025.

This oojo deal was found by Cheapflights users on 11/9. 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.
mié. 12/37:10 pmORD - OPO
1 stop11h 55mTAP AIR PORTUGAL
dom. 12/145:00 amOPO - ORD
1 stop15h 45mTAP AIR PORTUGAL
Deal found 11/9$425
This lol.travel deal was found by Cheapflights users on 11/8. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/288:15 pmORD - OPO
1 stop13h 40mTAP AIR PORTUGAL
jue. 12/118:00 pmOPO - ORD
1 stop25h 25mTAP AIR PORTUGAL
Deal found 11/8$426
This KAYAK deal was found by Cheapflights users on 11/9. 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.
mié. 12/319:50 pmORD - OPO
1 stop19h 50mLufthansa
vie. 1/166:00 amOPO - ORD
1 stop13h 10mLufthansa
Deal found 11/9$477
This Travelocity deal was found by Cheapflights users on 11/10. 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.
lun. 12/86:50 pmORD - OPO
1 stop34h 25mSWISS
lun. 12/157:20 pmOPO - ORD
1 stop27h 00mSWISS
Deal found 11/10$481
This KAYAK deal was found by Cheapflights users on 11/9. 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.
mar. 12/306:50 pmORD - OPO
1 stop17h 40mSWISS
lun. 1/1912:05 pmOPO - ORD
1 stop34h 15mSWISS
Deal found 11/9$482
This KLM deal was found by Cheapflights users on 11/9. 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.
mar. 11/251:25 pmORD - OPO
2 stops15h 05mKLM
mar. 12/24:10 pmOPO - ORD
1 stop28h 10mKLM
Deal found 11/9$487
This United Airlines deal was found by Cheapflights users on 11/9. 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. 12/303:20 pmORD - OPO
1 stop14h 20mUnited Airlines
vie. 1/166:00 amOPO - ORD
1 stop15h 20mUnited Airlines
Deal found 11/9$488
This KAYAK deal was found by Cheapflights users on 11/9. 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.
mié. 12/319:50 pmORD - OPO
1 stop19h 50mLufthansa
mié. 1/141:45 pmOPO - ORD
1 stop34h 40mLufthansa
Deal found 11/9$490
This Delta deal was found by Cheapflights users on 11/9. 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.
mié. 12/311:35 pmORD - OPO
2 stops14h 55mDelta
mié. 1/146:00 amOPO - ORD
2 stops20h 47mDelta
Deal found 11/9$492
This Delta deal was found by Cheapflights users on 11/9. 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.
mié. 12/314:25 pmORD - OPO
1 stop24h 00mDelta
mar. 1/136:05 amOPO - ORD
2 stops21h 30mDelta
Deal found 11/9$493
This KLM deal was found by Cheapflights users on 11/10. 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.
lun. 12/81:50 pmMDW - OPO
2 stops14h 40mKLM
lun. 12/1511:15 amOPO - MDW
2 stops18h 32mKLM
Deal found 11/10$616
This Delta deal was found by Cheapflights users on 11/10. 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.
vie. 11/285:34 pmMDW - OPO
2 stops15h 51mDelta
jue. 12/1111:15 amOPO - MDW
2 stops18h 32mDelta
Deal found 11/10$622

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 noviembre 10, 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

mié. 1/14

7:10 pm-6:00 pm

1 stop16h 50m

Porto

sáb. 1/24

4:55 pm-2:45 pm

1 stop27h 50m

$469

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

dom. 3/1

12:35 pm-9:30 am

2 stops14h 55m

Porto

mar. 3/31

6:00 am-2:50 pm

1 stop14h 50m

$478

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mié. 11/26

4:25 pm-7:20 pm

1 stop20h 55m

Porto

mar. 12/2

4:10 pm-2:20 pm

1 stop28h 10m

$482

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mar. 11/25

1:25 pm-10:30 am

2 stops15h 05m

Porto

mar. 12/2

4:10 pm-2:20 pm

1 stop28h 10m

$487

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mar. 12/30

3:20 pm-11:40 am

1 stop14h 20m

Porto

vie. 1/16

6:00 am-3:20 pm

1 stop15h 20m

$488

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mié. 12/31

1:35 pm-10:30 am

2 stops14h 55m

Porto

mié. 1/14

6:00 am-8:47 pm

2 stops20h 47m

$492

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

mié. 2/4

1:28 pm-10:30 am

2 stops15h 02m

Porto

mié. 2/11

6:00 am-5:32 pm

2 stops17h 32m

$492

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mar. 12/30

3:20 pm-11:40 am

1 stop14h 20m

Porto

jue. 1/15

6:00 am-6:15 pm

2 stops18h 15m

$498

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mié. 12/31

9:41 am-10:30 am

2 stops18h 49m

Porto

lun. 1/19

11:25 am-3:10 pm

1 stop33h 45m

$500

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mar. 11/25

4:20 pm-11:40 am

1 stop13h 20m

Porto

mar. 12/2

12:05 pm-4:20 pm

1 stop34h 15m

$505

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/10

Showing 1-10 of 28 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 November.
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 November 7, 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 52 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 $695). 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 noviembre 10, 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?

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 noviembre 10, 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
8,006 reviews

Entertainment

7.9

Overall

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

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
8,006 reviews
Delta
7.9
Good
8,006 reviews

Entertainment

7.9

Overall

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

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
9,012 reviews
Delta
7.9
Good
8,006 reviews

Entertainment

7.9

Overall

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

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
7.1
Good
2,057 reviews
Delta
7.9
Good
8,006 reviews

Entertainment

7.9

Overall

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

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
3,008 reviews
Delta
7.9
Good
8,006 reviews

Entertainment

7.9

Overall

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

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
7,565 reviews
Delta
7.9
Good
8,006 reviews

Entertainment

7.9

Overall

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

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 TAP AIR PORTUGAL, United Airlines, and KLM fly from Chicago to Porto in about 14h 55m. The time it takes to get you to your destination can typically vary by up to 6h. 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 $468, 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 35% 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, 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 $695). 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 noviembre 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$468Average$709FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$487Average$730FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$504Average$736FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$526Average$637FlexibilityNo cancel feeOn-time76%
KLMCheapest$531Average$680FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$545Average$721FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$554Average$719FlexibilityNo cancel feeOn-time71%
SWISSCheapest$558Average$756FlexibilityNo cancel feeOn-time79%
DeltaCheapest$638Average$841FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$646Average$732FlexibilityNo cancel feeOn-time67%

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