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$261+ Cheap flights from Illinois 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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — OPO
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
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Cheap flight deals from Illinois to Porto

Keep the following information in mind while searching for Illinois to Porto flight deals. Data was last updated November 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$425
(oojo)

One-way from

$261
(Kiwi.com)

Popular in

July

Cheapest in

January

Average price

$627
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 Illinois to Porto
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One-way flight from Illinois to Porto
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Highest demand for flights based on searches. 13% potential increase in price ($113 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($14 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 Illinois to Porto

Cheapest flights from Illinois to Porto
Explore the most affordable flight options available from Illinois to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 3, 2025.

This oojo deal was found by Cheapflights users on 11/2. 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 12/37:10 pmORD - OPO
1 stop11h 55mTAP AIR PORTUGAL
Sun 12/146:55 amOPO - ORD
1 stop13h 50mTAP AIR PORTUGAL
Deal found 11/2$425
This FlightHub deal was found by Cheapflights users on 11/3. 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.
Wed 11/127:10 pmORD - OPO
1 stop15h 50mTAP AIR PORTUGAL
Tue 11/186:00 pmOPO - ORD
1 stop27h 00mTAP AIR PORTUGAL
Deal found 11/3$440
This FlightHub deal was found by Cheapflights users on 11/2. 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.
Wed 11/127:10 pmORD - OPO
1 stop32h 45mTAP AIR PORTUGAL
Wed 11/198:55 amOPO - ORD
1 stop12h 05mTAP AIR PORTUGAL
Deal found 11/2$444
This Kiwi.com deal was found by Cheapflights users on 11/2. 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.
Mon 12/14:20 pmORD - OPO
1 stop13h 20mMultiple Airlines
Mon 12/87:20 pmOPO - ORD
1 stop27h 00mMultiple Airlines
Deal found 11/2$461
This Kiwi.com deal was found by Cheapflights users on 11/3. 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.
Sun 11/98:25 pmORD - OPO
1 stop10h 35mTAP AIR PORTUGAL
Wed 11/198:55 amOPO - ORD
1 stop12h 05mTAP AIR PORTUGAL
Deal found 11/3$466
This Mytrip deal was found by Cheapflights users on 11/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/127:10 pmORD - OPO
2 stops16h 25mMultiple Airlines
Tue 11/189:55 pmOPO - ORD
2 stops23h 05mMultiple Airlines
Deal found 11/1$476
This Delta deal was found by Cheapflights users on 11/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/25:20 pmORD - OPO
1 stop11h 10mDelta
Thu 12/1111:15 amOPO - ORD
1 stop33h 05mDelta
Deal found 11/1$477
This Air France deal was found by Cheapflights users on 11/2. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/252:35 pmORD - OPO
2 stops13h 55mMultiple Airlines
Tue 12/24:10 pmOPO - ORD
1 stop28h 10mMultiple Airlines
Deal found 11/2$481
This KAYAK deal was found by Cheapflights users on 11/1. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/306:50 pmORD - OPO
1 stop34h 25mSWISS
Thu 12/1112:05 pmOPO - ORD
1 stop34h 15mSWISS
Deal found 11/1$482
This Air France deal was found by Cheapflights users on 11/2. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/264:25 pmORD - OPO
1 stop12h 05mKLM
Tue 12/24:10 pmOPO - ORD
1 stop28h 10mKLM
Deal found 11/2$483
This Air Canada deal was found by Cheapflights users on 11/1. 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 12/312:50 pmORD - OPO
2 stops17h 15mAir Canada
Thu 12/116:00 amOPO - ORD
2 stops39h 10mAir Canada
Deal found 11/1$484
This KLM deal was found by Cheapflights users on 11/3. 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.
Mon 12/11:15 pmMDW - OPO
2 stops15h 15mKLM
Mon 12/86:30 amOPO - MDW
2 stops17h 48mKLM
Deal found 11/3$542

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois 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 November 3, 2025.
Use the filters below to find and compare flights from Illinois to Porto that are best for you.

Fly from

Illinois

Fly to

Porto

Route

Depart

Return

Price

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 12/1

4:20 pm-11:40 am

1 stop13h 20m

Porto

Mon 12/8

7:20 pm-4:20 pm

1 stop27h 00m

$461

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 12/3

9:40 am-10:30 am

2 stops18h 50m

Porto

Thu 12/11

11:15 am-2:20 pm

1 stop33h 05m

$481

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 12/3

7:10 am-11:40 am

2 stops22h 30m

Porto

Wed 12/17

12:30 pm-8:05 pm

1 stop13h 35m

$495

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 12/1

1:25 pm-10:30 am

2 stops39h 05m

Porto

Tue 12/16

6:05 am-8:38 pm

2 stops20h 33m

$497

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/26

9:00 am-9:30 am

2 stops18h 30m

Porto

Tue 12/2

12:30 pm-1:10 pm

1 stop30h 40m

$503

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 11/30

8:25 pm-5:00 pm

1 stop14h 35m

Porto

Sun 12/7

5:00 am-2:45 pm

1 stop15h 45m

$509

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 1/11

9:25 am-7:40 am

2 stops16h 15m

Porto

Fri 1/23

8:20 am-6:14 pm

2 stops15h 54m

$509

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 12/3

10:40 am-10:30 am

2 stops17h 50m

Porto

Mon 12/15

11:25 am-5:46 pm

2 stops36h 21m

$510

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 3/13

9:15 pm-7:00 pm

1 stop16h 45m

Porto

Sat 3/21

6:00 pm-3:45 pm

1 stop26h 45m

$512

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 1/11

3:50 pm-11:40 am

1 stop13h 50m

Porto

Fri 1/23

4:15 pm-3:29 pm

2 stops53h 14m

$515

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/2

Showing 1-10 of 39 results
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Best time to book a flight from Illinois to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Illinois 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 Illinois to Porto

What is the cheapest month to book a flight from Illinois to Porto?

Currently, November is the cheapest month in which you can book a flight from Illinois to Porto (average of $439). Flying from Illinois 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 IL to OPO?

Find hourly flight availability from Illinois 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 November 3, 2025.

One of the essential ways to save on airfare from Illinois to Porto is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 48% on airfare.

What is the cheapest day to fly from Illinois to Porto?

Use this chart to determine the cheapest time to fly round-trip from Illinois to Porto. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Illinois to Porto flight should consider departing on Wednesday evenings when fares are most often at their lowest. Saturday at noon 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 Illinois to Porto?

Related info for your journey

Find useful and relevant information for your journey from Illinois 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 Illinois?

    For a flight from Illinois to Porto, you will be flying into Porto. Porto (OPO) is just 6.8 mi from the center of the city.

  • How long is the flight from Illinois to Porto?

    A quick flight from Illinois to Porto can take about 16h 15m. Delta provides one of the quickest options available for as low as $509. Illinois and Porto are separated by a distance of 4154 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Illinois to Porto one-way?

    One-way options have recently been found by users for as low as $412 on Lufthansa. Other airlines that offer cheap prices include KLM from $423 and Delta from $488 one-way.

  • What are the most popular routes from Illinois to Porto?

    When deciding which route to take from Illinois to Porto consider Chicago O'Hare Intl - Porto, Chicago Midway - Porto or Lambert-St Louis - Porto as they are the most popular.

  • Can I find deals for flights from Illinois to Porto that include hotel bookings?

    Yes. In addition to deals on Illinois to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Porto.

  • Can I find deals for business class flights from Illinois to Porto?

    Yes. Cheapflights offers flight deals from Illinois 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 Illinois to Porto?

    Currently, November is the cheapest month in which you can book a flight from Illinois to Porto (average of $439). Flying from Illinois 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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Alternative routes for Illinois to Porto

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Top 10 airlines flying from Illinois to Porto

Discover the top 10 airlines that operate flights from Illinois 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 November 3, 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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