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$486+ 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 4/5. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — ORD
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap 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 December 18, 2025.

This Gotogate deal was found by Cheapflights users on 12/16. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/269:00 amOPO - ORD
1 stop12h 25mTAP AIR PORTUGAL
Wed 1/217:10 pmORD - OPO
1 stop16h 50mTAP AIR PORTUGAL
Deal found 12/16$726
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/248:55 amOPO - ORD
1 stop12h 05mTAP AIR PORTUGAL
Sun 1/188:25 pmORD - OPO
1 stop10h 35mTAP AIR PORTUGAL
Deal found 12/16$782
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/238:00 pmOPO - ORD
1 stop25h 00mTAP AIR PORTUGAL
Sun 1/188:25 pmORD - OPO
1 stop15h 40mTAP AIR PORTUGAL
Deal found 12/16$811
This KLM deal was found by Cheapflights users on 12/16. 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.
Thu 12/2511:15 amOPO - ORD
1 stop33h 05mMultiple Airlines
Wed 1/211:58 pmORD - OPO
2 stops14h 32mMultiple Airlines
Deal found 12/16$813
This KLM deal was found by Cheapflights users on 12/16. 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.
Sat 12/274:10 pmOPO - ORD
1 stop28h 10mKLM
Wed 1/214:25 pmORD - OPO
1 stop12h 05mKLM
Deal found 12/16$819
This Air France deal was found by Cheapflights users on 12/16. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/276:00 amOPO - ORD
2 stops20h 36mKLM
Tue 1/2010:35 amORD - OPO
2 stops17h 55mKLM
Deal found 12/16$825
This American Airlines deal was found by Cheapflights users on 12/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/238:20 amOPO - ORD
1 stop12h 35mAmerican Airlines
Fri 1/236:00 amORD - OPO
2 stops19h 40mAmerican Airlines
Deal found 12/16$841
This American Airlines deal was found by Cheapflights users on 12/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2412:25 pmOPO - ORD
2 stops33h 00mAmerican Airlines
Sun 1/1811:51 amORD - OPO
2 stops22h 09mAmerican Airlines
Deal found 12/16$846
This Turkish Airlines deal was found by Cheapflights users on 12/16. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2710:55 amOPO - ORD
1 stop29h 10mTurkish Airlines
Fri 1/238:20 pmORD - OPO
1 stop31h 35mTurkish Airlines
Deal found 12/16$865
This United Airlines deal was found by Cheapflights users on 12/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:00 amOPO - ORD
1 stop35h 10mUnited Airlines
Sat 1/244:05 pmORD - OPO
1 stop13h 35mUnited Airlines
Deal found 12/16$872
This American Airlines deal was found by Cheapflights users on 12/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/278:40 pmOPO - ORD
2 stops30h 34mAmerican Airlines
Sat 1/245:40 pmORD - OPO
1 stop12h 05mAmerican Airlines
Deal found 12/16$875
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/269:00 amOPO - ORD
1 stop12h 25mMultiple Airlines
Sat 1/246:30 pmORD - OPO
2 stops32h 45mMultiple Airlines
Deal found 12/16$900

Find flight deals from Porto to Illinois

Keep the following information in mind while searching for Porto to Illinois flight deals. Data was last updated December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$581
(Gotogate)

One-way from

$486
(eDestinos)

Popular in

September

Cheapest in

February

Average price

$867
Provider with most accurate pricing for Porto-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Porto-Chicago (CHI) flights.
Search Deals
From Porto to Illinois
Search Deals
One-way flight from Porto to Illinois
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($131 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 18, 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

Thu 1/15

1:00 pm-4:45 pm

2 stops33h 45m

Chicago O'Hare Intl

Wed 1/28

7:20 pm-9:15 pm

2 stops19h 55m

$612

PortoChicago

OPO - ORD

OPOORD

Porto

Sat 1/31

5:10 pm-2:45 pm

2 stops27h 35m

Chicago O'Hare Intl

Sat 2/7

4:38 pm-2:55 pm

2 stops16h 17m

$701

PortoChicago

OPO - ORD

OPOORD

Porto

Sat 1/31

5:00 am-2:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Sat 2/7

8:50 am-10:30 am

2 stops19h 40m

$773

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 1/15

11:15 am-2:20 pm

1 stop33h 05m

Chicago O'Hare Intl

Wed 1/28

4:25 pm-7:20 pm

1 stop20h 55m

$779

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 1/16

8:20 am-2:55 pm

1 stop12h 35m

Chicago O'Hare Intl

Mon 1/19

8:16 am-11:45 am

2 stops21h 29m

$807

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 1/16

6:00 am-3:20 pm

1 stop15h 20m

Chicago O'Hare Intl

Mon 1/19

6:25 pm-2:55 pm

1 stop14h 30m

$808

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Thu 1/22

6:00 am-9:13 pm

2 stops21h 13m

Lambert-St Louis

Mon 1/26

11:20 am-11:40 am

2 stops18h 20m

$860

PortoChicago

OPO - ORD

OPOORD

Porto

Sun 4/5

8:10 pm-6:50 pm

1 stop28h 40m

$486

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

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 $860, United Airlines can have you in Illinois from Porto in 21h 13m. The distance between Porto and Illinois is about 4154 mi.

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

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $484. Users have also found prices from $484 and $505 on Iberia and TAP AIR PORTUGAL, respectively.

  • 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.

See more FAQs

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