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$300+ Cheap flights from Porto (OPO) to Illinois

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 1/27. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — ORD
oct. 16 — oct. 231
jue. 10/16
jue. 10/23
1 adult, Economy
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Cheap flight deals from Porto to Illinois

Keep the following information in mind while searching for Porto to Illinois flight deals. Data was last updated septiembre 16, 2025.

Round-trip from

$390
(lol.travel)

One-way from

$300
(Kiwi.com)

Popular in

July

Cheapest in

March

Average price

$817
From Porto to Illinois
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One-way flight from Porto to Illinois
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Highest demand for flights based on searches. 16% potential increase in price ($161 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($31 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 Porto to Illinois

Cheapest flights from Porto to Illinois
Explore the most affordable flight options available from Porto to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 16, 2025.

This lol.travel 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/75:35 pmOPO - ORD
1 stop29h 10mScandinavian Airlines
dom. 11/237:20 pmORD - OPO
1 stop15h 25mScandinavian Airlines
Deal found 9/15$390
This Mytrip deal was found by Cheapflights users on 9/16. 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.
vie. 11/711:30 amOPO - ORD
2 stops35h 15mMultiple Airlines
dom. 11/237:20 pmORD - OPO
3 stops29h 30mMultiple Airlines
Deal found 9/16$526
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/219:15 pmOPO - ORD
1 stop24h 55mTAP AIR PORTUGAL
vie. 10/319:15 pmORD - OPO
1 stop19h 45mTAP AIR PORTUGAL
Deal found 9/15$560
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/134:05 pmOPO - ORD
2 stops29h 10mMultiple Airlines
vie. 11/288:15 pmORD - OPO
2 stops17h 05mMultiple Airlines
Deal found 9/14$585
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/216:35 pmOPO - ORD
2 stops27h 35mMultiple Airlines
vie. 10/319:15 pmORD - OPO
2 stops19h 10mMultiple Airlines
Deal found 9/15$588
This Delta deal was found by Cheapflights users on 9/16. 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. 11/116:05 amOPO - STL
2 stops20h 41mDelta
mar. 11/182:36 pmSTL - OPO
2 stops13h 54mDelta
Deal found 9/16$731
This KLM deal was found by Cheapflights users on 9/16. 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.
jue. 11/136:35 amOPO - STL
2 stops20h 11mKLM
mié. 11/1912:49 pmSTL - OPO
2 stops15h 41mKLM
Deal found 9/16$758
This British Airways deal was found by Cheapflights users on 9/16. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/105:30 pmOPO - STL
2 stops32h 53mBritish Airways
lun. 11/173:23 pmSTL - OPO
2 stops19h 17mBritish Airways
Deal found 9/16$760
This British Airways deal was found by Cheapflights users on 9/16. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/98:05 pmOPO - STL
2 stops53h 25mBritish Airways
sáb. 11/222:08 pmSTL - OPO
2 stops23h 07mBritish Airways
Deal found 9/16$774
This Lufthansa deal was found by Cheapflights users on 9/16. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/1312:30 pmOPO - STL
1 stop31h 25mLufthansa
mié. 11/193:50 pmSTL - OPO
1 stop13h 50mLufthansa
Deal found 9/16$806
This Lufthansa deal was found by Cheapflights users on 9/16. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/126:00 amOPO - STL
1 stop13h 55mLufthansa
mié. 11/193:50 pmSTL - OPO
1 stop13h 50mLufthansa
Deal found 9/16$814
This Lufthansa deal was found by Cheapflights users on 9/16. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/1312:30 pmOPO - STL
1 stop31h 25mLufthansa
mar. 11/1811:49 amSTL - OPO
1 stop15h 41mLufthansa
Deal found 9/16$819

Cheapflights Fare Finder

 
Customize your flight search to find flights from Porto to Illinois 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 16, 2025.
Use the filters below to find and compare flights from Porto to Illinois that are best for you.

Fly from

Porto

Fly to

Illinois

Route

Depart

Return

Price

PortoChicago

OPO - ORD

OPOORD

Porto

vie. 11/7

5:35 pm-4:45 pm

1 stop29h 10m

Chicago O'Hare Intl

dom. 11/23

7:20 pm-4:45 pm

1 stop15h 25m

$390

PortoChicago

OPO - ORD

OPOORD

Porto

vie. 11/7

11:30 am-4:45 pm

2 stops35h 15m

Chicago O'Hare Intl

dom. 11/23

7:20 pm-6:50 am

3 stops29h 30m

$526

PortoChicago

OPO - ORD

OPOORD

Porto

mar. 10/21

9:15 pm-4:10 pm

1 stop24h 55m

Chicago O'Hare Intl

vie. 10/31

9:15 pm-10:00 pm

1 stop19h 45m

$560

PortoChicago

OPO - ORD

OPOORD

Porto

jue. 11/13

4:05 pm-3:15 pm

2 stops29h 10m

Chicago O'Hare Intl

vie. 11/28

8:15 pm-7:20 pm

2 stops17h 05m

$585

PortoChicago

OPO - ORD

OPOORD

Porto

jue. 10/30

12:10 pm-5:45 pm

3 stops34h 35m

Chicago O'Hare Intl

jue. 11/6

7:20 pm-6:50 am

3 stops29h 30m

$626

PortoSt. Louis

OPO - STL

OPOSTL

Porto

mar. 11/11

6:05 am-8:46 pm

2 stops20h 41m

Lambert-St Louis

mar. 11/18

2:36 pm-10:30 am

2 stops13h 54m

$731

PortoSt. Louis

OPO - STL

OPOSTL

Porto

mié. 11/12

6:00 am-8:46 pm

2 stops20h 46m

Lambert-St Louis

mar. 11/18

12:49 pm-10:30 am

2 stops15h 41m

$758

PortoSt. Louis

OPO - STL

OPOSTL

Porto

mar. 11/11

6:05 am-4:33 pm

2 stops16h 28m

Lambert-St Louis

mié. 11/19

12:49 pm-10:30 am

2 stops15h 41m

$758

PortoSt. Louis

OPO - STL

OPOSTL

Porto

mar. 11/11

5:30 pm-4:47 pm

2 stops29h 17m

Lambert-St Louis

sáb. 11/22

2:08 pm-7:15 pm

2 stops23h 07m

$760

PortoSt. Louis

OPO - STL

OPOSTL

Porto

sáb. 11/15

8:05 pm-8:21 pm

2 stops30h 16m

Lambert-St Louis

sáb. 11/22

2:08 pm-7:15 pm

2 stops23h 07m

$760

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 26 results
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Best time to book a flight from Porto to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Porto 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 Porto to Illinois
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Porto to Illinois. 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 from for flights from Porto to Illinois?

    Porto (OPO), located 6.8 mi from the city center, is the airport you fly out of when you book flights from Porto to Illinois.

  • How long is the flight from Porto to Illinois?

    For as low as $731, Scandinavian Airlines can have you in Illinois from Porto in 20h 41m. The distance between Porto and Illinois is about 4154 mi. This flight may include one or multiple stops.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Porto to Illinois (average of $245). Flying from Porto to Illinois in March is currently the most expensive (average of $321). 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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