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$293+ 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 8/18. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — OPO
May 6 — May 131
Tue 5/6
Tue 5/13
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 May 1, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$565
(United)

One-way from

$293
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$793
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. 24% potential increase in price ($225 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in May 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 May 1, 2025.

This United deal was found by Cheapflights users on 4/30. 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.
Wed 8/206:00 amORD - OPO
1 stop21h 45mMultiple Airlines
Thu 8/2812:10 pmOPO - ORD
1 stop32h 41mMultiple Airlines
Deal found 4/30$565
This Air Canada deal was found by Cheapflights users on 5/1. 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.
Wed 9/173:35 pmORD - OPO
1 stop11h 45mAir Canada
Wed 9/246:00 amOPO - ORD
2 stops20h 11mAir Canada
Deal found 5/1$569
This Ovago deal was found by Cheapflights users on 5/1. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/174:30 pmORD - OPO
1 stop33h 05mBritish Airways
Wed 9/248:15 amOPO - ORD
1 stop12h 00mBritish Airways
Deal found 5/1$573
This oojo deal was found by Cheapflights users on 4/30. 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.
Sat 9/206:15 pmORD - OPO
1 stop14h 45mTAP AIR PORTUGAL
Fri 9/269:00 amOPO - ORD
1 stop13h 30mTAP AIR PORTUGAL
Deal found 4/30$577
This United Airlines deal was found by Cheapflights users on 5/1. 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 8/133:35 pmORD - OPO
1 stop11h 45mUnited Airlines
Wed 8/209:35 amOPO - ORD
1 stop13h 25mUnited Airlines
Deal found 5/1$583
This Cheapflightsfares deal was found by Cheapflights users on 5/1. 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.
Mon 10/1310:30 pmORD - OPO
2 stops18h 50mLufthansa
Tue 11/111:45 pmOPO - ORD
2 stops29h 40mLufthansa
Deal found 5/1$594
This Gurufare deal was found by Cheapflights users on 5/1. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/267:00 amORD - OPO
2 stops22h 00mScandinavian Airlines
Fri 9/55:55 pmOPO - ORD
1 stop28h 15mScandinavian Airlines
Deal found 5/1$598
This American Airlines deal was found by Cheapflights users on 4/29. 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.
Fri 10/104:30 pmORD - OPO
1 stop13h 10mAmerican Airlines
Tue 10/218:15 amOPO - ORD
2 stops19h 10mAmerican Airlines
Deal found 4/29$607
This oojo deal was found by Cheapflights users on 4/30. 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.
Thu 9/1811:25 amORD - OPO
1 stop16h 20mTurkish Airlines
Tue 10/710:50 amOPO - ORD
1 stop28h 50mTurkish Airlines
Deal found 4/30$610
This Delta deal was found by Cheapflights users on 4/30. 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 11/251:00 pmMDW - OPO
2 stops15h 30mDelta
Tue 12/25:00 amOPO - MDW
2 stops19h 36mDelta
Deal found 4/30$618
This CrystalTravel deal was found by Cheapflights users on 4/30. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/272:20 pmORD - OPO
1 stop15h 05mSWISS
Thu 9/48:40 amOPO - ORD
1 stop13h 15mSWISS
Deal found 4/30$625
This Expedia deal was found by Cheapflights users on 4/30. 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.
Wed 7/94:30 pmORD - OPO
1 stop17h 25mIberia
Wed 7/164:35 pmOPO - ORD
2 stops27h 55mIberia
Deal found 4/30$646

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 May 1, 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 8/20

6:00 am-9:45 am

1 stop21h 45m

Porto

Thu 8/28

12:10 pm-2:51 pm

1 stop32h 41m

$565

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 9/17

3:35 pm-9:20 am

1 stop11h 45m

Porto

Wed 9/24

6:00 am-8:11 pm

2 stops20h 11m

$569

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 9/17

4:30 pm-7:35 am

1 stop33h 05m

Porto

Wed 9/24

8:15 am-2:15 pm

1 stop12h 00m

$573

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sat 9/20

6:15 pm-3:00 pm

1 stop14h 45m

Porto

Fri 9/26

9:00 am-4:30 pm

1 stop13h 30m

$577

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 8/13

3:35 pm-9:20 am

1 stop11h 45m

Porto

Wed 8/20

9:35 am-5:00 pm

1 stop13h 25m

$583

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 10/13

10:30 pm-11:20 pm

2 stops18h 50m

Porto

Tue 11/11

1:45 pm-1:25 pm

2 stops29h 40m

$594

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 8/26

7:00 am-11:00 am

2 stops22h 00m

Porto

Fri 9/5

5:55 pm-4:10 pm

1 stop28h 15m

$598

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 10/10

4:30 pm-11:40 am

1 stop13h 10m

Porto

Tue 10/21

8:15 am-9:25 pm

2 stops19h 10m

$607

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Thu 9/18

11:25 am-9:45 am

1 stop16h 20m

Porto

Tue 10/7

4:50 pm-9:40 am

1 stop22h 50m

$610

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 8/13

5:59 pm-3:30 pm

2 stops15h 31m

Porto

Wed 8/20

6:15 am-6:03 pm

2 stops17h 48m

$639

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 33 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 May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 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 AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Chicago-Porto flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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 April 25, 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 $1,071). 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 May 1, 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.

Rainfall in Porto by month

Plan your trip to Porto by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Porto ranges from 0.7 - 7.7 inches per month. December is typically the wettest month, when rainfall can reach 7.7 in. July is typically the driest time to visit Porto when rainfall is around 0.7 in.

Temperature in Porto by month

Plan your trip to Porto by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Porto, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

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 May 1, 2025.
Read through reviews of airlines operating flights from Chicago to Porto, such as Delta, Porter Airlines and KLM. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,934 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Porter Airlines
8.0
Very good
285 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,334 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Austrian Airlines
7.6
Good
781 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
SWISS
7.5
Good
1,589 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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?

    Air Canada, at $569, was found to be the cheapest airline from Chicago to Porto.Alternate airlines to your destination round-trip include British Airways and TAP AIR PORTUGAL. Air Canada is 20% 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 ($304), British Airways ($479), and American Airlines ($485).

  • 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 Commerce Square more than anywhere else. Chiado, Praça do Marquês de Pombal, and Commerce Square are located about 4.5 mi, 3.6 mi, and 4.7 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 $22 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 $1,071). 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 Chicago?

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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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$419Average$616FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$468Average$736FlexibilityNo cancel feeOn-time71%
IberiaCheapest$472Average$701FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$504Average$736FlexibilityNo cancel feeOn-time70%
DeltaCheapest$514Average$803FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$535Average$727FlexibilityNo cancel feeOn-time76%
SWISSCheapest$558Average$765FlexibilityNo cancel feeOn-time79%
KLMCheapest$563Average$797FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$576Average$840FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$646Average$732FlexibilityNo cancel feeOn-time67%

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