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$299+ 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 5/23. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — ORD
May 5 — May 121
Mon 5/5
Mon 5/12
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 April 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
2 stars

Round-trip from

$662
(Scandinavian Airlines)

One-way from

$299
(Kiwi.com)

Popular in

July

Cheapest in

March

Average price

$682
Provider with most accurate pricing for Porto-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Porto-Chicago (CHI) flights.
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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. 13% potential increase in price ($128 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 30, 2025.

This Scandinavian Airlines deal was found by Cheapflights users on 4/29. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/105:55 pmOPO - ORD
1 stop28h 15mScandinavian Airlines
Mon 10/137:15 pmORD - OPO
1 stop33h 45mScandinavian Airlines
Deal found 4/29$662
This Delta deal was found by Cheapflights users on 4/28. 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.
Thu 6/126:30 amOPO - ORD
1 stop13h 40mDelta
Tue 6/246:27 pmORD - OPO
2 stops15h 03mDelta
Deal found 4/28$689
This KLM deal was found by Cheapflights users on 4/28. 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 5/154:20 pmOPO - ORD
1 stop27h 50mKLM
Wed 5/284:20 pmORD - OPO
1 stop23h 55mKLM
Deal found 4/28$695
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Fri 6/136:00 amOPO - ORD
1 stop19h 55mUnited Airlines
Mon 6/232:26 pmORD - OPO
1 stop13h 19mUnited Airlines
Deal found 4/28$735
This Mytrip deal was found by Cheapflights users on 4/29. 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.
Thu 5/1511:00 amOPO - ORD
3 stops31h 10mMultiple Airlines
Wed 5/282:00 pmORD - OPO
2 stops14h 00mMultiple Airlines
Deal found 4/29$741
This Travelocity deal was found by Cheapflights users on 4/29. 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.
Thu 5/297:20 pmOPO - ORD
1 stop26h 35mSWISS
Tue 6/32:20 pmORD - OPO
1 stop15h 10mSWISS
Deal found 4/29$767
This Lufthansa deal was found by Cheapflights users on 4/29. 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.
Wed 10/86:15 amOPO - ORD
1 stop18h 00mLufthansa
Sun 10/129:40 pmORD - OPO
1 stop19h 40mLufthansa
Deal found 4/29$774
This lol.travel deal was found by Cheapflights users on 4/28. 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.
Sun 12/286:00 amOPO - ORD
2 stops21h 59mAir Canada
Sun 1/44:00 pmORD - OPO
2 stops14h 50mAir Canada
Deal found 4/28$778
This American Airlines deal was found by Cheapflights users on 4/29. 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.
Fri 10/108:15 amOPO - ORD
2 stops17h 15mAmerican Airlines
Fri 10/174:30 pmORD - OPO
1 stop13h 10mAmerican Airlines
Deal found 4/29$804
This Turkish Airlines deal was found by Cheapflights users on 4/29. 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.
Fri 10/104:50 pmOPO - ORD
1 stop31h 05mTurkish Airlines
Tue 10/147:50 pmORD - OPO
1 stop32h 15mTurkish Airlines
Deal found 4/29$840
This Austrian Airlines deal was found by Cheapflights users on 4/29. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/910:25 amOPO - ORD
2 stops38h 05mAustrian Airlines
Tue 10/144:20 pmORD - OPO
1 stop35h 15mAustrian Airlines
Deal found 4/29$870
This British Airways deal was found by Cheapflights users on 4/28. 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.
Tue 5/138:40 pmOPO - STL
2 stops27h 53mBritish Airways
Sat 5/177:19 pmSTL - OPO
2 stops19h 16mBritish Airways
Deal found 4/28$978

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 April 30, 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

Fri 10/10

5:55 pm-4:10 pm

1 stop28h 15m

Chicago O'Hare Intl

Mon 10/13

7:15 pm-11:00 am

1 stop33h 45m

$662

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 6/12

6:30 am-2:10 pm

1 stop13h 40m

Chicago O'Hare Intl

Tue 6/24

6:27 pm-3:30 pm

2 stops15h 03m

$689

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 5/15

4:20 pm-2:10 pm

1 stop27h 50m

Chicago O'Hare Intl

Wed 5/28

4:20 pm-10:15 pm

1 stop23h 55m

$695

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 6/13

6:00 am-7:55 pm

1 stop19h 55m

Chicago O'Hare Intl

Mon 6/23

2:26 pm-9:45 am

1 stop13h 19m

$735

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 5/15

11:00 am-12:10 pm

3 stops31h 10m

Chicago O'Hare Intl

Wed 5/28

2:00 pm-10:00 am

2 stops14h 00m

$741

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 5/29

7:20 pm-3:55 pm

1 stop26h 35m

Chicago O'Hare Intl

Tue 6/3

2:20 pm-11:30 am

1 stop15h 10m

$767

PortoChicago

OPO - ORD

OPOORD

Porto

Wed 10/8

6:15 am-6:15 pm

1 stop18h 00m

Chicago O'Hare Intl

Sun 10/12

9:40 pm-11:20 pm

1 stop19h 40m

$774

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 10/10

8:15 am-7:30 pm

2 stops17h 15m

Chicago O'Hare Intl

Fri 10/17

4:30 pm-11:40 am

1 stop13h 10m

$804

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 10/10

4:50 pm-5:55 pm

1 stop31h 05m

Chicago O'Hare Intl

Tue 10/14

7:50 pm-10:05 am

1 stop32h 15m

$840

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 10/9

10:25 am-6:30 pm

2 stops38h 05m

Chicago O'Hare Intl

Tue 10/14

4:20 pm-9:35 am

1 stop35h 15m

$870

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 25 results
1
2
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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

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.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated April 30, 2025.
See what other customers who have flown with Delta, KLM and Austrian Airlines from Porto to Illinois have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,929 reviews
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,334 reviews
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Austrian Airlines
7.6
Good
780 reviews
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
SWISS
7.5
Good
1,588 reviews
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,696 reviews
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

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

    For one-way options, check prices for TAP AIR PORTUGAL. According to our data, you can fly for as low as $570. Users have also found prices from $606 and $679 on Turkish Airlines and American Airlines, 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.

  • 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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Alternative routes for Porto to Illinois

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