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$391+ 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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — ORD
ago. 4 — ago. 111
lun. 8/4
lun. 8/11
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 julio 30, 2025.

Round-trip from

$542
(lol.travel)

One-way from

$391
(Kiwi.com)

Popular in

July

Cheapest in

March

Average price

$1,103
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 ($164 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in July 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 julio 30, 2025.

This lol.travel deal was found by Cheapflights users on 7/30. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/189:15 pmOPO - ORD
1 stop25h 15mTAP AIR PORTUGAL
jue. 10/26:00 pmORD - OPO
1 stop17h 00mTAP AIR PORTUGAL
Deal found 7/30$542
This Mytrip deal was found by Cheapflights users on 7/30. 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.
jue. 8/284:55 pmOPO - ORD
2 stops29h 15mMultiple Airlines
dom. 9/286:00 pmORD - OPO
2 stops22h 35mMultiple Airlines
Deal found 7/30$674
This Delta deal was found by Cheapflights users on 7/30. 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.
jue. 9/186:30 amOPO - ORD
1 stop13h 40mDelta
jue. 10/26:28 pmORD - OPO
2 stops15h 02mDelta
Deal found 7/30$677
This KLM deal was found by Cheapflights users on 7/29. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/186:30 amOPO - ORD
1 stop13h 40mKLM
jue. 10/25:10 pmORD - OPO
1 stop16h 20mKLM
Deal found 7/29$683
This Iberia deal was found by Cheapflights users on 7/30. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/278:15 amOPO - ORD
1 stop12h 00mIberia
vie. 9/264:30 pmORD - OPO
1 stop21h 25mIberia
Deal found 7/30$687
This American Airlines deal was found by Cheapflights users on 7/29. 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.
jue. 9/188:15 amOPO - ORD
1 stop12h 00mAmerican Airlines
jue. 10/24:30 pmORD - OPO
1 stop13h 10mAmerican Airlines
Deal found 7/29$692
This lol.travel deal was found by Cheapflights users on 7/30. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/225:55 pmOPO - ORD
1 stop28h 15mScandinavian Airlines
lun. 8/257:15 pmORD - OPO
1 stop33h 45mScandinavian Airlines
Deal found 7/30$795
This United Airlines deal was found by Cheapflights users on 7/30. 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.
lun. 10/2712:35 pmOPO - ORD
2 stops16h 08mUnited Airlines
lun. 11/32:00 pmORD - OPO
2 stops13h 30mUnited Airlines
Deal found 7/30$812
This Turkish Airlines deal was found by Cheapflights users on 7/30. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/274:10 pmOPO - ORD
1 stop23h 55mTurkish Airlines
sáb. 11/112:50 pmORD - OPO
1 stop21h 20mTurkish Airlines
Deal found 7/30$852
This British Airways deal was found by Cheapflights users on 7/29. 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.
jue. 9/188:15 amOPO - ORD
2 stops17h 18mBritish Airways
jue. 10/210:35 pmORD - OPO
1 stop15h 45mBritish Airways
Deal found 7/29$855
This SWISS deal was found by Cheapflights users on 7/29. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/128:40 amOPO - ORD
1 stop13h 15mSWISS
vie. 9/197:05 pmORD - OPO
2 stops36h 40mSWISS
Deal found 7/29$877
This Air France deal was found by Cheapflights users on 7/30. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/159:20 amOPO - STL
2 stops20h 02mAir France
mar. 8/195:11 pmSTL - OPO
2 stops16h 19mAir France
Deal found 7/30$1,223

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 julio 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

jue. 9/18

9:15 pm-4:30 pm

1 stop25h 15m

Chicago O'Hare Intl

jue. 10/2

6:00 pm-5:00 pm

1 stop17h 00m

$542

PortoChicago

OPO - ORD

OPOORD

Porto

vie. 11/21

11:30 am-4:45 pm

2 stops35h 15m

Chicago O'Hare Intl

sáb. 11/29

7:20 pm-6:50 am

3 stops29h 30m

$598

PortoChicago

OPO - ORD

OPOORD

Porto

jue. 9/18

6:30 am-2:10 pm

1 stop13h 40m

Chicago O'Hare Intl

jue. 10/2

6:28 pm-3:30 pm

2 stops15h 02m

$677

PortoChicago

OPO - ORD

OPOORD

Porto

jue. 9/18

6:30 am-5:59 pm

2 stops17h 29m

Chicago O'Hare Intl

jue. 10/2

5:10 pm-3:30 pm

1 stop16h 20m

$688

PortoChicago

OPO - ORD

OPOORD

Porto

jue. 9/18

8:15 am-2:15 pm

1 stop12h 00m

Chicago O'Hare Intl

jue. 10/2

4:30 pm-11:40 am

1 stop13h 10m

$692

PortoChicago

OPO - ORD

OPOORD

Porto

sáb. 9/13

8:15 am-7:45 pm

2 stops17h 30m

Chicago O'Hare Intl

sáb. 9/20

4:30 pm-11:40 am

1 stop13h 10m

$698

PortoChicago

OPO - ORD

OPOORD

Porto

sáb. 12/13

7:50 pm-6:45 pm

1 stop28h 55m

Chicago O'Hare Intl

mar. 12/30

9:45 pm-5:35 pm

1 stop13h 50m

$716

PortoSt. Louis

OPO - STL

OPOSTL

Porto

vie. 8/15

9:20 am-11:22 pm

2 stops20h 02m

Lambert-St Louis

mar. 8/19

5:11 pm-3:30 pm

2 stops16h 19m

$1,223

PortoSt. Louis

OPO - STL

OPOSTL

Porto

vie. 8/15

9:00 am-11:35 pm

1 stop20h 35m

Lambert-St Louis

mar. 8/19

11:27 am-7:45 am

1 stop14h 18m

$1,373

PortoSt. Louis

OPO - STL

OPOSTL

Porto

vie. 8/15

7:10 am-8:00 pm

2 stops18h 50m

Lambert-St Louis

mar. 8/19

1:30 pm-8:25 pm

3 stops24h 55m

$1,537

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 16 results
1
2

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

How much does it cost to fly round-trip from Porto to Illinois?

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 julio 30, 2025.
Get a feel of what it's like to fly with Delta, KLM, and Austrian Airlines from Porto to Illinois by reading reviews from past customers. 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
7,980 reviews

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very good
7,980 reviews
Delta
8.0
Very good
7,980 reviews

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,980 reviews

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Austrian Airlines
7.6
Good
823 reviews
Delta
8.0
Very good
7,980 reviews

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Air France
7.5
Good
1,465 reviews
Delta
8.0
Very good
7,980 reviews

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
SWISS
7.5
Good
1,686 reviews
Delta
8.0
Very good
7,980 reviews

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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 $475. Users have also found prices from $691 and $704 on British Airways and Lufthansa, 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.

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Alternative routes for Porto to Illinois

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