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$306+ 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 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — OPO
Aug 22 — Aug 291
Sat 8/22
Sat 8/29
1 adult, Economy
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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 July 23, 2026.

This Gotogate deal was found by Cheapflights users on 7/22. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/96:00 pm
ORD
-
OPO
1 stop17h 00m
TAP AIR PORTUGAL
Tue 8/2510:30 pm
OPO
-
ORD
1 stop22h 15m
TAP AIR PORTUGAL
Deal found 7/22$615
This oojo deal was found by Cheapflights users on 7/19. 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 9/206:00 pm
ORD
-
OPO
1 stop15h 00m
TAP AIR PORTUGAL
Thu 10/17:00 am
OPO
-
ORD
1 stop11h 40m
TAP AIR PORTUGAL
Deal found 7/19$619
This oojo deal was found by Cheapflights users on 7/19. 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.
Wed 9/236:00 pm
ORD
-
OPO
1 stop15h 00m
TAP AIR PORTUGAL
Wed 10/75:05 am
OPO
-
ORD
1 stop16h 55m
TAP AIR PORTUGAL
Deal found 7/19$621
This oojo deal was found by Cheapflights users on 7/18. 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.
Wed 8/126:00 pm
ORD
-
OPO
1 stop17h 00m
TAP AIR PORTUGAL
Wed 8/199:00 am
OPO
-
ORD
1 stop33h 40m
TAP AIR PORTUGAL
Deal found 7/18$626
This Gotogate deal was found by Cheapflights users on 7/19. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:00 pm
ORD
-
OPO
1 stop23h 00m
TAP AIR PORTUGAL
Wed 10/1410:00 am
OPO
-
ORD
1 stop12h 00m
TAP AIR PORTUGAL
Deal found 7/19$631
This Trip.com deal was found by Cheapflights users on 7/22. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/117:00 pm
ORD
-
OPO
1 stop23h 30m
TAP AIR PORTUGAL
Wed 11/187:00 am
OPO
-
ORD
1 stop14h 30m
TAP AIR PORTUGAL
Deal found 7/22$636
This FlightHub deal was found by Cheapflights users on 7/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/146:00 pm
ORD
-
OPO
1 stop22h 55m
TAP AIR PORTUGAL
Sun 8/239:00 am
OPO
-
ORD
1 stop13h 00m
TAP AIR PORTUGAL
Deal found 7/18$638
This Booking.com deal was found by Cheapflights users on 7/22. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:00 pm
ORD
-
OPO
1 stop17h 00m
TAP AIR PORTUGAL
Wed 10/145:05 am
OPO
-
ORD
1 stop16h 55m
TAP AIR PORTUGAL
Deal found 7/22$640
This TAP AIR PORTUGAL deal was found by Cheapflights users on 7/22. 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 TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:00 pm
ORD
-
OPO
1 stop31h 50m
TAP AIR PORTUGAL
Wed 10/1410:00 am
OPO
-
ORD
1 stop32h 40m
TAP AIR PORTUGAL
Deal found 7/22$658
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/226:05 pm
ORD
-
OPO
1 stop14h 55m
TAP AIR PORTUGAL
Sat 8/299:15 pm
OPO
-
ORD
1 stop24h 45m
TAP AIR PORTUGAL
Deal found 7/23$673
This Delta deal was found by Cheapflights users on 7/22. 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 12/19:30 am
MDW
-
OPO
2 stops19h 05m
Delta
Sun 12/65:00 am
OPO
-
MDW
2 stops17h 50m
Delta
Deal found 7/22$829
This Delta deal was found by Cheapflights users on 7/20. 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 11/312:28 pm
MDW
-
OPO
2 stops16h 07m
Delta
Sun 11/85:55 am
OPO
-
MDW
2 stops16h 44m
Delta
Deal found 7/20$831

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 July 23, 2026.

Most accurate provider

Ovago
3 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$615
(Gotogate)

One-way from

$306
(Kiwi.com)

Popular in

June

Cheapest in

April

Average price

$1,008
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 ($120 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
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 July 23, 2026.
Use the filters below to find and compare flights from Chicago to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 11/15

11:15 am-9:30 am

2 stops16h 15m

Porto

Thu 11/19

6:00 am-1:10 pm

1 stop13h 10m

$763

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 10/13

9:00 am-7:00 am

2 stops16h 00m

Porto

Tue 11/3

6:00 am-1:10 pm

1 stop13h 10m

$796

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 10/13

5:24 pm-3:25 pm

2 stops16h 01m

Porto

Tue 11/3

5:00 am-8:30 pm

2 stops21h 30m

$808

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 11/1

11:30 am-10:35 am

2 stops17h 05m

Porto

Sun 11/8

5:00 am-2:25 pm

1 stop15h 25m

$820

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 9/13

8:10 pm-9:40 am

1 stop31h 30m

Porto

Thu 10/1

4:40 pm-9:40 am

1 stop23h 00m

$831

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Sun 11/1

12:28 pm-10:35 am

2 stops16h 07m

Porto

Sun 11/8

5:55 am-6:05 pm

2 stops18h 10m

$836

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Thu 10/29

12:05 pm-7:40 am

2 stops14h 35m

Porto

Mon 11/2

8:40 pm-4:00 pm

2 stops25h 20m

$843

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/11

7:00 pm-1:30 pm

1 stop12h 30m

Porto

Thu 11/12

8:00 pm-3:30 pm

1 stop25h 30m

$848

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 12/4

12:40 pm-9:30 am

2 stops14h 50m

Porto

Sat 12/12

6:00 am-3:20 pm

1 stop15h 20m

$863

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Fri 12/4

12:30 pm-10:35 am

2 stops16h 05m

Porto

Sat 12/12

5:00 am-6:37 pm

2 stops19h 37m

$874

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/18

Showing 1-10 of 35 resultsSorted by cheapest first
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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 July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
Justfly.comPrice 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 Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Chicago-Porto flight deals on Cheapflights vs. Ovago >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 Ovago the most. Ovago 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

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 $558). Flying from Chicago to Porto in June is currently the most expensive (average of $1,152). 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.

How much does it cost to fly round-trip from Chicago to Porto?

How far ahead should I book a flight from Chicago to Porto?

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.

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 July 23, 2026.
See what other customers who have flown with United Airlines,TAP AIR PORTUGAL, andIberia 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.
United Airlines
7.4
Good
10,021 reviews

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Ruth,Dec 2024

ORD - AMS

United Airlines flights seem to always use a bus to/from the boarding gate to the plane. Can they not get their own gate? This time there was no lift when leaving the plane and people in wheelchairs somehow had to climb down the steps to the ground to get to the bus. I udon’t know how some managed that!
United Airlines
7.4
Good
10,021 reviews
United Airlines
7.4
Good
10,021 reviews

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Ruth,Dec 2024

ORD - AMS

United Airlines flights seem to always use a bus to/from the boarding gate to the plane. Can they not get their own gate? This time there was no lift when leaving the plane and people in wheelchairs somehow had to climb down the steps to the ground to get to the bus. I udon’t know how some managed that!
TAP AIR PORTUGAL
7.2
Good
2,342 reviews
United Airlines
7.4
Good
10,021 reviews

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Ruth,Dec 2024

ORD - AMS

United Airlines flights seem to always use a bus to/from the boarding gate to the plane. Can they not get their own gate? This time there was no lift when leaving the plane and people in wheelchairs somehow had to climb down the steps to the ground to get to the bus. I udon’t know how some managed that!
Iberia
7.0
Good
3,258 reviews
United Airlines
7.4
Good
10,021 reviews

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Ruth,Dec 2024

ORD - AMS

United Airlines flights seem to always use a bus to/from the boarding gate to the plane. Can they not get their own gate? This time there was no lift when leaving the plane and people in wheelchairs somehow had to climb down the steps to the ground to get to the bus. I udon’t know how some managed that!
Lufthansa
6.8
Okay
8,159 reviews
United Airlines
7.4
Good
10,021 reviews

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Ruth,Dec 2024

ORD - AMS

United Airlines flights seem to always use a bus to/from the boarding gate to the plane. Can they not get their own gate? This time there was no lift when leaving the plane and people in wheelchairs somehow had to climb down the steps to the ground to get to the bus. I udon’t know how some managed that!

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. 7 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, Delta, and KLM fly from Chicago to Porto in about 14h 29m. The time it takes to get you to your destination can typically vary by up to 2h 31m. 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 $451, was found to be the cheapest airline from Chicago to Porto.Alternate airlines to your destination round-trip include Lufthansa and United Airlines. TAP AIR PORTUGAL is 42% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 $558). Flying from Chicago to Porto in June is currently the most expensive (average of $1,152). 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
Vila Nova de Gaia
Arcos de Valdevez
Coimbra
Aveiro

Browse thousands of different options on Cheapflights for your next trip

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Top 7 airlines flying from Chicago to Porto

Discover the top 7 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 July 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$451Average$839FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$474Average$610FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$489Average$813FlexibilityNo cancel feeOn-time69%
IberiaCheapest$519Average$747FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$524Average$832FlexibilityNo cancel feeOn-time71%
KLMCheapest$531Average$679FlexibilityNo cancel feeOn-time75%
Turkish AirlinesCheapest$618Average$666FlexibilityNo cancel feeOn-time77%

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