HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Porto

$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. 15 — oct. 221
mié. 10/15
mié. 10/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 septiembre 15, 2025.

Round-trip from

$410
(lol.travel)

One-way from

$264
(Booking.com)

Popular in

July

Cheapest in

January

Average price

$670
From Chicago (CHI) to Porto
Search Deals
One-way flight from Chicago (CHI) to Porto
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($115 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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 septiembre 15, 2025.

This lol.travel deal was found by Cheapflights users on 9/14. 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.
lun. 10/2712:45 pmORD - OPO
2 stops15h 45mUnited Airlines
mié. 11/1212:35 pmOPO - ORD
1 stop13h 32mUnited Airlines
Deal found 9/14$410
This lastminute.com deal was found by Cheapflights users on 9/13. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/2712:50 pmORD - OPO
2 stops18h 15mMultiple Airlines
mié. 11/1212:10 pmOPO - ORD
1 stop34h 10mMultiple Airlines
Deal found 9/13$413
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
mié. 10/2910:50 pmORD - OPO
1 stop19h 50mMultiple Airlines
mié. 11/57:20 pmOPO - ORD
1 stop27h 00mMultiple Airlines
Deal found 9/14$425
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.
lun. 10/275:45 pmORD - OPO
1 stop17h 15mAmerican Airlines
mié. 11/128:20 amOPO - ORD
1 stop12h 10mAmerican Airlines
Deal found 9/15$446
This United Airlines deal was found by Cheapflights users on 9/14. 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.
mié. 11/264:20 pmORD - OPO
1 stop11h 10mUnited Airlines
mar. 12/26:00 amOPO - ORD
1 stop13h 10mUnited Airlines
Deal found 9/14$450
This oojo deal was found by Cheapflights users on 9/13. 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.
mar. 11/256:50 pmORD - OPO
1 stop34h 25mSWISS
mar. 12/212:05 pmOPO - ORD
1 stop34h 15mSWISS
Deal found 9/13$453
This lol.travel deal was found by Cheapflights users on 9/14. 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.
mié. 10/299:10 pmORD - OPO
2 stops31h 20mUnited Airlines
mié. 11/512:35 pmOPO - ORD
1 stop25h 07mUnited Airlines
Deal found 9/14$454
This United Airlines deal was found by Cheapflights users on 9/13. 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.
dom. 11/165:31 pmORD - OPO
1 stop9h 59mUnited Airlines
jue. 11/276:00 amOPO - ORD
1 stop13h 10mUnited Airlines
Deal found 9/13$458
This KAYAK deal was found by Cheapflights users on 9/13. 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.
dom. 11/166:50 pmORD - OPO
1 stop34h 25mSWISS
lun. 11/2412:05 pmOPO - ORD
1 stop34h 15mSWISS
Deal found 9/13$459
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/2610:47 amMDW - OPO
2 stops17h 43mDelta
mar. 12/26:05 amOPO - MDW
2 stops17h 55mDelta
Deal found 9/15$479
This KLM deal was found by Cheapflights users on 9/14. 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. 10/271:48 pmMDW - OPO
2 stops15h 42mKLM
mié. 11/126:00 amOPO - MDW
2 stops18h 18mKLM
Deal found 9/14$484
This Delta deal was found by Cheapflights users on 9/14. 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.
mar. 10/149:35 amMDW - OPO
2 stops19h 05mDelta
mar. 10/216:15 amOPO - MDW
2 stops18h 10mDelta
Deal found 9/14$567

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 septiembre 15, 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

lun. 10/27

3:07 pm-9:30 am

1 stop13h 23m

Porto

mié. 11/12

12:35 pm-11:43 pm

2 stops17h 08m

$436

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mié. 11/26

2:30 pm-9:30 am

1 stop13h 00m

Porto

mar. 12/2

6:00 am-1:10 pm

1 stop13h 10m

$450

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

lun. 11/17

5:31 pm-9:30 am

1 stop9h 59m

Porto

mié. 11/26

12:30 pm-8:05 pm

1 stop13h 35m

$458

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

lun. 11/17

4:20 pm-9:30 am

1 stop11h 10m

Porto

jue. 11/27

6:00 am-8:05 pm

1 stop20h 05m

$458

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

lun. 11/17

3:07 pm-9:30 am

1 stop12h 23m

Porto

mar. 11/25

6:00 am-1:10 pm

1 stop13h 10m

$458

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

dom. 11/16

5:31 pm-9:30 am

1 stop9h 59m

Porto

jue. 11/27

6:00 am-1:10 pm

1 stop13h 10m

$458

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

dom. 11/16

5:31 pm-9:30 am

1 stop9h 59m

Porto

mié. 11/26

6:00 am-8:05 pm

1 stop20h 05m

$458

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

mié. 11/26

10:47 am-10:30 am

2 stops17h 43m

Porto

mar. 12/2

6:05 am-6:00 pm

2 stops17h 55m

$479

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

lun. 10/27

1:48 pm-10:30 am

2 stops15h 42m

Porto

mié. 11/12

6:00 am-6:18 pm

2 stops18h 18m

$484

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

mié. 12/3

1:14 pm-10:30 am

2 stops15h 16m

Porto

dom. 12/7

11:15 am-6:00 pm

2 stops36h 45m

$582

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 30 results
1
2
3

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 $1,027). 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 septiembre 15, 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 septiembre 15, 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
7,954 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

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
7,954 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

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
8,929 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

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
1,975 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

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
2,924 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

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
7,407 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

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, Delta, and KLM fly from Chicago to Porto in about 13h 23m. The time it takes to get you to your destination can typically vary by up to 4h 20m. 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 $20 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 $1,027). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 septiembre 15, 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%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.