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$377+ 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 4/24. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — ORD
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
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 March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$572
(Gotogate)

One-way from

$377
(Kiwi.com)

Popular in

July

Cheapest in

March

Average price

$635
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. 14% potential increase in price ($130 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 March 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 March 28, 2025.

This Gotogate deal was found by Cheapflights users on 3/27. 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 5/165:55 pmOPO - ORD
1 stop28h 15mScandinavian Airlines
Thu 5/297:15 pmORD - OPO
1 stop15h 50mScandinavian Airlines
Deal found 3/27$572
This KLM deal was found by Cheapflights users on 3/27. 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 6/124:20 pmOPO - ORD
1 stop27h 50mKLM
Tue 6/244:20 pmORD - OPO
1 stop17h 15mKLM
Deal found 3/27$663
This American Airlines deal was found by Cheapflights users on 3/27. 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 5/168:15 amOPO - ORD
1 stop12h 00mAmerican Airlines
Thu 5/294:40 pmORD - OPO
2 stops13h 00mAmerican Airlines
Deal found 3/27$669
This Mytrip deal was found by Cheapflights users on 3/27. 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.
Fri 5/97:10 amOPO - ORD
2 stops32h 42mMultiple Airlines
Sun 5/258:40 amORD - OPO
2 stops25h 35mMultiple Airlines
Deal found 3/27$686
This Delta deal was found by Cheapflights users on 3/27. 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.
Fri 4/116:40 amOPO - ORD
1 stop13h 30mDelta
Mon 4/211:25 pmORD - OPO
2 stops20h 05mDelta
Deal found 3/27$703
This Iberia deal was found by Cheapflights users on 3/27. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/168:15 amOPO - ORD
1 stop12h 00mIberia
Thu 5/294:30 pmORD - OPO
1 stop33h 05mIberia
Deal found 3/27$709
This United Airlines deal was found by Cheapflights users on 3/27. 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 11/246:00 amOPO - ORD
2 stops23h 12mUnited Airlines
Mon 12/12:45 pmORD - OPO
2 stops18h 30mUnited Airlines
Deal found 3/27$745
This Mytrip deal was found by Cheapflights users on 3/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/126:15 amOPO - ORD
2 stops31h 47mAir Canada
Mon 5/197:00 amORD - OPO
2 stops22h 25mAir Canada
Deal found 3/28$756
This AirNGo deal was found by Cheapflights users on 3/27. 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/109:15 pmOPO - ORD
1 stop25h 15mTAP AIR PORTUGAL
Fri 10/176:00 pmORD - OPO
1 stop10h 35mTAP AIR PORTUGAL
Deal found 3/27$793
This British Airways deal was found by Cheapflights users on 3/26. 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.
Mon 3/319:10 pmOPO - ORD
1 stop22h 40mBritish Airways
Sat 6/141:25 pmORD - OPO
2 stops25h 05mBritish Airways
Deal found 3/26$841
This KLM deal was found by Cheapflights users on 3/27. 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 4/126:55 pmOPO - STL
2 stops26h 42mKLM
Wed 4/165:37 pmSTL - OPO
2 stops15h 58mKLM
Deal found 3/27$1,017
This Lufthansa deal was found by Cheapflights users on 3/26. 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.
Sat 3/296:00 amOPO - ORD
1 stop33h 55mLufthansa
Sun 6/1510:30 pmORD - OPO
1 stop18h 20mLufthansa
Deal found 3/26$1,310

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 March 28, 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 5/16

5:55 pm-4:10 pm

1 stop28h 15m

Chicago O'Hare Intl

Thu 5/29

7:15 pm-5:05 pm

1 stop15h 50m

$572

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 6/12

4:20 pm-2:10 pm

1 stop27h 50m

Chicago O'Hare Intl

Tue 6/24

4:20 pm-3:35 pm

1 stop17h 15m

$663

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 5/16

8:15 am-2:15 pm

1 stop12h 00m

Chicago O'Hare Intl

Thu 5/29

4:40 pm-11:40 am

2 stops13h 00m

$669

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 5/9

7:10 am-9:52 am

2 stops32h 42m

Chicago O'Hare Intl

Sun 5/25

8:40 am-4:15 pm

2 stops25h 35m

$686

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 4/11

6:40 am-2:10 pm

1 stop13h 30m

Chicago O'Hare Intl

Mon 4/21

1:25 pm-3:30 pm

2 stops20h 05m

$703

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 5/16

8:15 am-2:15 pm

1 stop12h 00m

Chicago O'Hare Intl

Thu 5/29

4:30 pm-7:35 am

1 stop33h 05m

$709

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 5/12

6:15 am-8:02 am

2 stops31h 47m

Chicago O'Hare Intl

Mon 5/19

7:00 am-11:25 am

2 stops22h 25m

$756

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Sat 4/12

6:55 pm-3:37 pm

2 stops26h 42m

Lambert-St Louis

Wed 4/16

5:37 pm-3:35 pm

2 stops15h 58m

$1,017

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Sat 4/12

12:35 pm-11:14 pm

1 stop16h 39m

Lambert-St Louis

Wed 4/16

8:25 am-9:45 am

2 stops19h 20m

$1,334

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Sat 4/12

7:30 am-5:15 pm

3 stops39h 45m

Lambert-St Louis

Wed 4/16

12:15 pm-11:00 am

3 stops16h 45m

$1,572

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 15 results
1
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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 $323). 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 March 28, 2025.
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

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
7,897 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

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
1,321 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

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
1,570 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

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
8,603 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

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
Turkish Airlines
7.3
Good
3,744 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

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 $547. Users have also found prices from $578 and $921 on Turkish Airlines and Iberia, 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 $323). 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

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Porto to Illinois

Discover the top airline that operate flights from Porto to Illinois. 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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$746Average$879FlexibilityNo cancel feeOn-time69%
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