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$224+ 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 9/27. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — OPO
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
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 September 11, 2025.

Round-trip from

$434
(United Airlines)

One-way from

$224
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$703
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. 15% potential increase in price ($129 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/272:22 pmORD - OPO
1 stop14h 08mUnited Airlines
Wed 11/1212:35 pmOPO - ORD
1 stop13h 32mUnited Airlines
Deal found 9/11$434
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Mon 10/207:10 amORD - OPO
1 stop20h 35mUnited Airlines
Wed 11/512:35 pmOPO - ORD
2 stops17h 08mUnited Airlines
Deal found 9/10$436
This Gotogate deal was found by Cheapflights users on 9/10. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2612:50 pmORD - OPO
2 stops17h 15mMultiple Airlines
Wed 12/312:10 pmOPO - ORD
1 stop34h 10mMultiple Airlines
Deal found 9/10$437
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/266:50 pmORD - OPO
1 stop34h 20mSWISS
Wed 12/312:10 pmOPO - ORD
1 stop34h 10mSWISS
Deal found 9/10$446
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Mon 11/1712:45 pmORD - OPO
2 stops14h 45mUnited Airlines
Tue 11/2512:35 pmOPO - ORD
1 stop13h 32mUnited Airlines
Deal found 9/10$448
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Wed 11/262:30 pmORD - OPO
1 stop13h 00mUnited Airlines
Tue 12/26:00 amOPO - ORD
1 stop13h 10mUnited Airlines
Deal found 9/10$450
This oojo deal was found by Cheapflights users on 9/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/256:50 pmORD - OPO
1 stop34h 25mSWISS
Tue 12/212:05 pmOPO - ORD
1 stop34h 15mSWISS
Deal found 9/10$453
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
Wed 10/297:50 pmORD - OPO
1 stop17h 45mSWISS
Sun 11/96:35 pmOPO - ORD
2 stops51h 45mSWISS
Deal found 9/9$461
This Air France deal was found by Cheapflights users on 9/10. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/206:23 pmMDW - OPO
2 stops15h 07mMultiple Airlines
Wed 11/56:00 amOPO - MDW
2 stops17h 43mMultiple Airlines
Deal found 9/10$471
This Delta deal was found by Cheapflights users on 9/10. 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.
Mon 11/171:47 pmMDW - OPO
2 stops14h 28mDelta
Tue 11/2511:10 amOPO - MDW
2 stops18h 22mDelta
Deal found 9/10$478
This Delta deal was found by Cheapflights users on 9/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2612:47 pmMDW - OPO
2 stops15h 43mDelta
Tue 12/26:05 amOPO - MDW
2 stops17h 55mDelta
Deal found 9/11$479
This Air France deal was found by Cheapflights users on 9/11. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/251:14 pmMDW - OPO
2 stops15h 16mKLM
Tue 12/26:05 amOPO - MDW
2 stops17h 55mKLM
Deal found 9/11$492

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 September 11, 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 10/27

2:22 pm-9:30 am

1 stop14h 08m

Porto

Wed 11/12

12:35 pm-8:07 pm

1 stop13h 32m

$434

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 10/20

7:10 am-9:45 am

1 stop20h 35m

Porto

Wed 11/5

12:35 pm-11:43 pm

2 stops17h 08m

$436

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/26

6:50 pm-11:10 am

1 stop34h 20m

Porto

Wed 12/3

12:10 pm-4:20 pm

1 stop34h 10m

$447

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 11/17

12:45 pm-9:30 am

2 stops14h 45m

Porto

Tue 11/25

12:35 pm-8:07 pm

1 stop13h 32m

$448

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/26

9:00 am-9:30 am

2 stops18h 30m

Porto

Wed 12/3

6:00 am-11:43 pm

2 stops23h 43m

$464

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Mon 10/20

6:23 pm-3:30 pm

2 stops15h 07m

Porto

Wed 11/5

6:00 am-5:43 pm

2 stops17h 43m

$471

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 11/14

8:15 pm-6:00 pm

1 stop15h 45m

Porto

Tue 11/25

6:00 pm-3:00 pm

1 stop27h 00m

$476

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Mon 11/17

1:47 pm-10:15 am

2 stops14h 28m

Porto

Tue 11/25

11:10 am-11:32 pm

2 stops18h 22m

$478

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 10/27

10:22 am-10:15 am

2 stops18h 53m

Porto

Wed 11/12

6:00 am-9:27 pm

2 stops21h 27m

$479

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 11/26

12:47 pm-10:30 am

2 stops15h 43m

Porto

Tue 12/2

6:05 am-6:00 pm

2 stops17h 55m

$479

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 49 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, January is the cheapest month in which you can book a flight from Illinois to Porto (average of $523). Flying from Illinois 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 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 September 11, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Porto as you normally would.

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 14h 08m. United Airlines provides one of the quickest options available for as low as $434. Illinois and Porto are separated by a distance of 3931 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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, January is the cheapest month in which you can book a flight from Illinois to Porto (average of $523). Flying from Illinois 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

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Alternative routes for Illinois to Porto

See prices for flight routes from nearby airports that may be better suited for you.
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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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$453Average$669FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$472Average$712FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$504Average$736FlexibilityNo cancel feeOn-time70%
KLMCheapest$525Average$698FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$553Average$657FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$553Average$728FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$554Average$724FlexibilityNo cancel feeOn-time71%
SWISSCheapest$558Average$756FlexibilityNo cancel feeOn-time79%
DeltaCheapest$639Average$828FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$646Average$732FlexibilityNo cancel feeOn-time67%

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