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$521+ 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 7/4. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — ORD
Feb 4 — Feb 111
Tue 2/4
Tue 2/11
1 adult, Economy
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Cheap flight deals from Porto to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from Porto (OPO) to Illinois (USIL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$563
(Mytrip)

One-way from

$521
(Mytrip)

Popular in

June

Cheapest in

February

Average price

$912
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. 16% potential increase in price ($165 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($25 potential savings vs. average RT price).
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Average for round-trip flights in January 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 January 30, 2025.

This Mytrip deal was found by Cheapflights users on 1/30. 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.
Tue 3/116:40 pmOPO - ORD
1 stop18h 04mMultiple Airlines
Tue 3/185:22 pmORD - OPO
1 stop13h 53mMultiple Airlines
Deal found 1/30$563
This Delta deal was found by Cheapflights users on 1/30. 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 2/246:20 amOPO - ORD
1 stop14h 10mDelta
Tue 3/116:20 pmORD - OPO
1 stop11h 15mDelta
Deal found 1/30$614
This Gotogate deal was found by Cheapflights users on 1/30. 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.
Mon 2/248:20 amOPO - ORD
1 stop12h 10mIberia
Tue 3/1110:45 pmORD - OPO
2 stops27h 55mIberia
Deal found 1/30$616
This American Airlines deal was found by Cheapflights users on 1/29. 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.
Sun 4/278:15 amOPO - ORD
1 stop12h 00mAmerican Airlines
Mon 5/1211:40 amORD - OPO
2 stops13h 55mAmerican Airlines
Deal found 1/29$624
This British Airways deal was found by Cheapflights users on 1/29. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/28:15 amOPO - ORD
1 stop12h 00mBritish Airways
Thu 5/811:40 amORD - OPO
2 stops26h 45mBritish Airways
Deal found 1/29$639
This KLM deal was found by Cheapflights users on 1/30. 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.
Mon 11/245:00 amOPO - ORD
2 stops16h 05mKLM
Mon 12/11:35 pmORD - OPO
2 stops15h 15mKLM
Deal found 1/30$653
This Lufthansa deal was found by Cheapflights users on 1/29. 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.
Sun 4/276:00 amOPO - ORD
1 stop19h 55mLufthansa
Mon 5/125:50 pmORD - OPO
1 stop23h 30mLufthansa
Deal found 1/29$716
This SWISS deal was found by Cheapflights users on 1/30. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/118:40 amOPO - ORD
1 stop13h 15mSWISS
Mon 4/216:35 pmORD - OPO
1 stop31h 20mSWISS
Deal found 1/30$719
This United Airlines deal was found by Cheapflights users on 1/30. 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 3/1712:25 pmOPO - STL
2 stops55h 41mUnited Airlines
Mon 3/241:45 pmSTL - OPO
2 stops20h 40mUnited Airlines
Deal found 1/30$760
This FlightHub deal was found by Cheapflights users on 1/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/712:00 pmOPO - ORD
1 stop34h 10mScandinavian Airlines
Thu 11/207:30 pmORD - OPO
1 stop15h 35mScandinavian Airlines
Deal found 1/29$829
This United Airlines deal was found by Cheapflights users on 1/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/49:00 amOPO - ORD
1 stop12h 05mUnited Airlines
Sat 11/223:15 pmORD - OPO
1 stop18h 00mUnited Airlines
Deal found 1/29$907
This Mytrip deal was found by Cheapflights users on 1/30. 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 3/1710:45 amOPO - STL
3 stops34h 57mMultiple Airlines
Mon 3/2410:03 amSTL - OPO
3 stops25h 57mMultiple Airlines
Deal found 1/30$971

Find flights from Porto to Illinois within your budget

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 January 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

PortoChicago

OPO - ORD

OPOORD

Porto

Tue 3/11

6:40 pm-7:44 am

1 stop18h 04m

Chicago O'Hare Intl

Tue 3/18

5:22 pm-12:15 pm

1 stop13h 53m

$563

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 2/24

6:20 am-2:30 pm

1 stop14h 10m

Chicago O'Hare Intl

Tue 3/11

6:20 pm-10:35 am

1 stop11h 15m

$614

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 2/24

8:20 am-2:30 pm

1 stop12h 10m

Chicago O'Hare Intl

Tue 3/11

10:45 pm-7:40 am

2 stops27h 55m

$616

PortoChicago

OPO - ORD

OPOORD

Porto

Sun 4/27

8:15 am-2:15 pm

1 stop12h 00m

Chicago O'Hare Intl

Mon 5/12

11:40 am-7:35 am

2 stops13h 55m

$624

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 5/2

8:15 am-2:15 pm

1 stop12h 00m

Chicago O'Hare Intl

Thu 5/8

11:40 am-8:25 pm

2 stops26h 45m

$639

PortoChicago

OPO - ORD

OPOORD

Porto

Sun 4/27

6:00 am-7:55 pm

1 stop19h 55m

Chicago O'Hare Intl

Mon 5/12

5:50 pm-11:20 pm

1 stop23h 30m

$716

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 4/11

8:40 am-3:55 pm

1 stop13h 15m

Chicago O'Hare Intl

Mon 4/21

6:35 pm-7:55 am

1 stop31h 20m

$719

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Mon 3/17

12:25 pm-3:06 pm

2 stops55h 41m

Lambert-St Louis

Mon 3/24

1:45 pm-3:25 pm

2 stops20h 40m

$760

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 7/7

12:00 pm-4:10 pm

1 stop34h 10m

Chicago O'Hare Intl

Thu 11/20

7:30 pm-5:05 pm

1 stop15h 35m

$829

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 7/4

9:00 am-3:05 pm

1 stop12h 05m

Chicago O'Hare Intl

Sat 11/22

3:15 pm-3:15 pm

1 stop18h 00m

$907

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/30

Showing 1-10 of 21 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.

Travel insights for flights from Porto to Illinois

Get recent, data-driven insights about flights from Porto to Illinois including ideal travel times, pricing trends, and more.

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 $325). 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 January 30, 2025.
Delta
8.0
Very good
8,450 reviews

Food

7.3

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

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
8,450 reviews
Delta
8.0
Very good
8,450 reviews

Food

7.3

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

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
1,335 reviews
Delta
8.0
Very good
8,450 reviews

Food

7.3

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

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
1,584 reviews
Delta
8.0
Very good
8,450 reviews

Food

7.3

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

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
8,906 reviews
Delta
8.0
Very good
8,450 reviews

Food

7.3

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

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
3,903 reviews
Delta
8.0
Very good
8,450 reviews

Food

7.3

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

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 Turkish Airlines. According to our data, you can fly for as low as $558. Users have also found prices from $647 and $698 on TAP AIR PORTUGAL and British Airways, 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 $325). 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 January 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$846Average$879FlexibilityNo cancel feeOn-time69%
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