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$306+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — ORD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$507
(AirNGo)

One-way from

$306
(Kiwi.com)

Popular in

July

Cheapest in

March

Average price

$748
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 ($134 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This AirNGo deal was found by Cheapflights users on 6/10. 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 10/1010:35 pmOPO - ORD
1 stop23h 55mTAP AIR PORTUGAL
Fri 10/176:00 pmORD - OPO
1 stop24h 40mTAP AIR PORTUGAL
Deal found 6/10$507
This American Airlines deal was found by Cheapflights users on 6/12. 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.
Mon 11/248:20 amOPO - ORD
1 stop12h 10mAmerican Airlines
Mon 12/14:45 pmORD - OPO
1 stop17h 15mAmerican Airlines
Deal found 6/12$537
This Gotogate deal was found by Cheapflights users on 6/12. 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 6/238:35 pmOPO - ORD
1 stop23h 40mIberia
Tue 7/84:30 pmORD - OPO
1 stop13h 10mIberia
Deal found 6/12$561
This lol.travel deal was found by Cheapflights users on 6/11. 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.
Sat 6/218:15 amOPO - ORD
1 stop12h 00mMultiple Airlines
Mon 7/710:30 pmORD - OPO
1 stop15h 20mMultiple Airlines
Deal found 6/11$656
This Delta deal was found by Cheapflights users on 6/12. 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 6/236:30 amOPO - ORD
1 stop13h 40mDelta
Tue 7/87:00 amORD - OPO
2 stops19h 25mDelta
Deal found 6/12$675
This KLM deal was found by Cheapflights users on 6/12. 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 10/275:00 amOPO - ORD
1 stop15h 30mKLM
Mon 12/295:20 pmORD - OPO
1 stop11h 30mKLM
Deal found 6/12$744
This Gotogate deal was found by Cheapflights users on 6/10. 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.
Tue 8/2612:15 pmOPO - ORD
1 stop29h 55mSWISS
Thu 12/117:05 pmORD - OPO
1 stop15h 25mSWISS
Deal found 6/10$747
This Lufthansa deal was found by Cheapflights users on 6/10. 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.
Mon 10/276:00 amOPO - ORD
1 stop20h 05mLufthansa
Mon 12/296:00 pmORD - OPO
1 stop12h 50mLufthansa
Deal found 6/10$763
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Tue 8/2612:05 pmOPO - ORD
2 stops28h 50mUnited Airlines
Thu 12/1111:15 amORD - OPO
2 stops18h 25mUnited Airlines
Deal found 6/10$772
This Air Canada deal was found by Cheapflights users on 6/10. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/276:00 amOPO - ORD
2 stops30h 58mAir Canada
Mon 12/292:00 pmORD - OPO
2 stops16h 50mAir Canada
Deal found 6/10$776
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Sat 8/306:00 amOPO - STL
2 stops36h 25mUnited Airlines
Mon 9/86:15 amSTL - OPO
2 stops21h 20mUnited Airlines
Deal found 6/10$811
This Delta deal was found by Cheapflights users on 6/10. 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.
Tue 6/176:15 amOPO - STL
2 stops17h 04mDelta
Tue 7/86:04 pmSTL - OPO
2 stops15h 31mDelta
Deal found 6/10$855

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 June 12, 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

10:35 pm-4:30 pm

1 stop23h 55m

Chicago O'Hare Intl

Fri 10/17

6:00 pm-12:40 am

1 stop24h 40m

$507

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 11/24

8:20 am-2:30 pm

1 stop12h 10m

Chicago O'Hare Intl

Mon 12/1

4:45 pm-4:00 pm

1 stop17h 15m

$537

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 6/23

8:35 pm-2:15 pm

1 stop23h 40m

Chicago O'Hare Intl

Tue 7/8

4:30 pm-11:40 am

1 stop13h 10m

$561

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 6/23

6:30 am-2:10 pm

1 stop13h 40m

Chicago O'Hare Intl

Tue 7/8

7:00 am-8:25 am

2 stops19h 25m

$675

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 10/27

5:00 am-3:30 pm

1 stop15h 30m

Chicago O'Hare Intl

Mon 12/29

5:20 pm-10:50 am

1 stop11h 30m

$744

PortoChicago

OPO - ORD

OPOORD

Porto

Tue 8/26

12:15 pm-12:10 pm

1 stop29h 55m

Chicago O'Hare Intl

Thu 12/11

7:05 pm-4:30 pm

1 stop15h 25m

$747

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 10/27

6:00 am-9:05 pm

1 stop20h 05m

Chicago O'Hare Intl

Mon 12/29

6:00 pm-12:50 pm

1 stop12h 50m

$763

PortoChicago

OPO - ORD

OPOORD

Porto

Tue 8/26

8:40 am-3:55 pm

1 stop13h 15m

Chicago O'Hare Intl

Thu 12/11

7:20 am-11:50 am

2 stops22h 30m

$764

PortoChicago

OPO - ORD

OPOORD

Porto

Tue 8/26

12:05 pm-10:55 am

2 stops28h 50m

Chicago O'Hare Intl

Thu 12/11

11:15 am-11:40 am

2 stops18h 25m

$772

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 10/27

6:00 am-7:58 am

2 stops30h 58m

Chicago O'Hare Intl

Mon 12/29

2:00 pm-12:50 pm

2 stops16h 50m

$776

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 36 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

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 June 12, 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
7,950 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,358 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Austrian Airlines
7.6
Good
802 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,623 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,790 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 $548. Users have also found prices from $592 and $608 on British Airways and Turkish 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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