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$294+ 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 8/21. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — OPO
juin 17 — juin 241
mar. 6/17
mar. 6/24
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 juin 12, 2025.

Round-trip from

$654
(United Airlines)

One-way from

$294
(Mytrip)

Popular in

July

Cheapest in

November

Average price

$854
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. 18% potential increase in price ($157 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in June 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 juin 12, 2025.

This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 9/146:00 pmORD - OPO
1 stop10h 55mTAP AIR PORTUGAL
sam. 9/2011:00 amOPO - ORD
1 stop11h 30mTAP AIR PORTUGAL
Deal found 6/10$653
This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 8/179:00 amORD - OPO
2 stops15h 55mUnited Airlines
dim. 8/3112:10 pmOPO - ORD
2 stops29h 47mUnited Airlines
Deal found 6/10$654
This Travelocity deal was found by Cheapflights users on 6/10. 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.
mar. 7/84:30 pmORD - OPO
1 stop33h 05mIberia
mer. 7/234:35 pmOPO - ORD
2 stops26h 55mIberia
Deal found 6/10$655
This Justfly.com deal was found by Cheapflights users on 6/10. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 10/1610:30 pmORD - OPO
1 stop18h 15mMultiple Airlines
dim. 10/266:00 amOPO - ORD
2 stops33h 58mMultiple Airlines
Deal found 6/10$665
This Air Canada deal was found by Cheapflights users on 6/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 9/146:06 pmORD - OPO
2 stops33h 29mAir Canada
lun. 9/226:00 amOPO - ORD
2 stops32h 01mAir Canada
Deal found 6/10$677
This Delta deal was found by Cheapflights users on 6/10. 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.
lun. 7/74:20 pmORD - OPO
1 stop19h 35mDelta
mar. 7/156:35 amOPO - ORD
1 stop14h 25mDelta
Deal found 6/10$684
This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 9/1311:45 pmORD - OPO
1 stop28h 10mTurkish Airlines
dim. 9/215:10 pmOPO - ORD
1 stop22h 30mTurkish Airlines
Deal found 6/10$685
This Cheapflightsfares deal was found by Cheapflights users on 6/11. 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.
jeu. 10/164:00 pmORD - OPO
1 stop17h 45mLufthansa
dim. 10/266:15 amOPO - ORD
2 stops19h 50mLufthansa
Deal found 6/11$696
This SWISS deal was found by Cheapflights users on 6/11. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 7/77:05 pmORD - OPO
2 stops36h 40mSWISS
jeu. 7/172:35 pmOPO - ORD
2 stops31h 20mSWISS
Deal found 6/11$709
This Delta deal was found by Cheapflights users on 6/10. 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.
mar. 8/266:17 pmMDW - OPO
2 stops15h 18mDelta
ven. 9/56:40 amOPO - MDW
2 stops20h 46mDelta
Deal found 6/10$713
This KLM deal was found by Cheapflights users on 6/10. 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.
ven. 9/194:20 pmORD - OPO
1 stop17h 15mKLM
ven. 9/266:40 amOPO - ORD
1 stop13h 30mKLM
Deal found 6/10$715
This Ovago deal was found by Cheapflights users on 6/10. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/294:30 pmORD - OPO
1 stop17h 25mBritish Airways
dim. 8/39:25 pmOPO - ORD
1 stop23h 15mBritish Airways
Deal found 6/10$782

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 juin 12, 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

dim. 8/17

9:00 am-6:55 am

2 stops15h 55m

Porto

dim. 8/31

12:10 pm-11:57 am

2 stops29h 47m

$654

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mar. 7/8

4:30 pm-7:35 am

1 stop33h 05m

Porto

mer. 7/23

4:35 pm-1:30 pm

2 stops26h 55m

$655

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

lun. 7/7

4:20 pm-5:55 pm

1 stop19h 35m

Porto

mar. 7/15

6:35 am-3:00 pm

1 stop14h 25m

$684

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

lun. 7/7

7:01 pm-3:35 pm

2 stops14h 34m

Porto

mar. 7/15

6:35 am-3:00 pm

1 stop14h 25m

$686

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mar. 8/26

6:06 pm-9:20 am

2 stops33h 14m

Porto

ven. 9/5

6:00 am-8:11 pm

2 stops20h 11m

$700

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

lun. 7/7

7:05 pm-1:45 pm

2 stops36h 40m

Porto

jeu. 7/17

2:35 pm-3:55 pm

2 stops31h 20m

$709

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

ven. 8/22

6:00 pm-10:35 am

1 stop10h 35m

Porto

lun. 9/1

7:00 am-4:40 pm

1 stop15h 40m

$710

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

mar. 8/26

6:17 pm-3:35 pm

2 stops15h 18m

Porto

ven. 9/5

6:40 am-9:26 pm

2 stops20h 46m

$713

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

lun. 7/7

9:40 pm-11:20 pm

1 stop19h 40m

Porto

jeu. 7/17

6:00 am-2:55 pm

1 stop14h 55m

$736

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mar. 6/24

4:20 pm-10:40 am

1 stop12h 20m

Porto

mar. 7/1

6:50 pm-2:40 pm

1 stop25h 50m

$741

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 27 results
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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 June 9, 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 $1,047). 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 juin 12, 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 juin 12, 2025.
Read through reviews of airlines operating flights from Chicago to Porto, such as Porter Airlines, Delta and KLM. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
288 reviews

Crew

8.7

Overall

8.0

Food

7.6

Comfort

8.1

Entertainment

7.0

Boarding

8.2

Reviews

1 / 20
4.0
Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!
Porter Airlines
8.0
Very good
288 reviews
Porter Airlines
8.0
Very good
288 reviews

Crew

8.7

Overall

8.0

Food

7.6

Comfort

8.1

Entertainment

7.0

Boarding

8.2

Reviews

1 / 20
4.0
Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!
Delta
8.0
Very good
7,946 reviews
Porter Airlines
8.0
Very good
288 reviews

Crew

8.7

Overall

8.0

Food

7.6

Comfort

8.1

Entertainment

7.0

Boarding

8.2

Reviews

1 / 20
4.0
Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!
KLM
7.8
Good
1,358 reviews
Porter Airlines
8.0
Very good
288 reviews

Crew

8.7

Overall

8.0

Food

7.6

Comfort

8.1

Entertainment

7.0

Boarding

8.2

Reviews

1 / 20
4.0
Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!
Air France
7.5
Good
1,463 reviews
Porter Airlines
8.0
Very good
288 reviews

Crew

8.7

Overall

8.0

Food

7.6

Comfort

8.1

Entertainment

7.0

Boarding

8.2

Reviews

1 / 20
4.0
Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!
SWISS
7.5
Good
1,623 reviews
Porter Airlines
8.0
Very good
288 reviews

Crew

8.7

Overall

8.0

Food

7.6

Comfort

8.1

Entertainment

7.0

Boarding

8.2

Reviews

1 / 20
4.0
Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!

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?

    United Airlines, at $654, was found to be the cheapest airline from Chicago to Porto.Alternate airlines to your destination round-trip include Iberia and Delta. United Airlines is 4% 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 ($295), Lufthansa ($456), and Air Canada ($458).

  • 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 $21 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 $1,047). 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

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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 juin 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$415Average$617FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$468Average$730FlexibilityNo cancel feeOn-time71%
IberiaCheapest$472Average$700FlexibilityNo cancel feeOn-time77%
DeltaCheapest$498Average$734FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$504Average$736FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$535Average$724FlexibilityNo cancel feeOn-time76%
SWISSCheapest$558Average$752FlexibilityNo cancel feeOn-time79%
KLMCheapest$563Average$796FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$569Average$795FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$646Average$732FlexibilityNo cancel feeOn-time67%

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