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$314+ Cheap flights from Portugal 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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — ORD
May 6 — May 131
Tue 5/6
Tue 5/13
1 adult, Economy
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Cheap flight deals from Portugal to Illinois

Keep the following information in mind while searching for Portugal to Illinois flight deals. Data was last updated May 1, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$665
(Expedia)

One-way from

$314
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$712

Good one-way deal

$628 or less
Provider with most accurate pricing for Lisbon Humberto Delgado-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Lisbon Humberto Delgado-Chicago (CHI) flights.
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From Portugal to Illinois
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One-way flight from Portugal to Illinois
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Highest demand for flights based on searches. 12% potential increase in price ($119 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in May 2025
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Price to beat on a one-way flight from Portugal to Illinois.
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Find flight deals from Portugal to Illinois

Cheapest flights from Portugal to Illinois
Explore the most affordable flight options available from Portugal to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.

This Justfly.com 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/164:55 pmLIS - ORD
1 stop29h 50mScandinavian Airlines
Mon 11/247:20 pmORD - LIS
1 stop20h 10mScandinavian Airlines
Deal found 4/29$573
This Expedia deal was found by Cheapflights users on 4/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/166:35 amLIS - ORD
1 stop13h 40mMultiple Airlines
Thu 5/2910:25 pmORD - LIS
1 stop18h 40mMultiple Airlines
Deal found 4/30$665
This Delta deal was found by Cheapflights users on 4/30. 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.
Fri 5/165:00 amLIS - ORD
1 stop15h 10mDelta
Thu 5/291:45 pmORD - LIS
2 stops15h 30mDelta
Deal found 4/30$676
This Iberia deal was found by Cheapflights users on 4/30. 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.
Thu 5/158:15 amOPO - ORD
1 stop12h 00mIberia
Wed 5/2811:45 amORD - OPO
2 stops13h 50mIberia
Deal found 4/30$681
This KLM deal was found by Cheapflights users on 4/30. 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.
Thu 5/297:30 pmLIS - ORD
1 stop24h 40mKLM
Thu 6/54:20 pmORD - LIS
1 stop12h 35mKLM
Deal found 4/30$681
This Delta deal was found by Cheapflights users on 4/30. 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.
Thu 6/126:30 amOPO - ORD
1 stop13h 40mDelta
Tue 6/246:27 pmORD - OPO
2 stops15h 03mDelta
Deal found 4/30$691
This American Airlines deal was found by Cheapflights users on 4/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/911:05 amLIS - ORD
1 stop11h 50mAmerican Airlines
Wed 7/97:00 amORD - LIS
1 stop20h 05mAmerican Airlines
Deal found 4/30$692
This Delta deal was found by Cheapflights users on 4/30. 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 6/95:40 amLIS - MDW
2 stops19h 01mDelta
Tue 6/246:20 pmMDW - LIS
2 stops18h 20mDelta
Deal found 4/30$693
This British Airways deal was found by Cheapflights users on 4/30. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/106:35 amLIS - ORD
1 stop13h 40mBritish Airways
Thu 7/109:15 pmORD - LIS
1 stop19h 50mBritish Airways
Deal found 4/30$699
This British Airways deal was found by Cheapflights users on 4/30. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/248:20 amOPO - ORD
1 stop12h 10mMultiple Airlines
Mon 12/112:15 pmORD - OPO
2 stops13h 25mMultiple Airlines
Deal found 4/30$700
This KLM deal was found by Cheapflights users on 4/30. 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.
Fri 6/136:40 amOPO - ORD
2 stops17h 23mKLM
Mon 6/237:00 pmORD - OPO
2 stops14h 35mKLM
Deal found 4/30$702
This British Airways deal was found by Cheapflights users on 4/30. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/248:20 amOPO - ORD
2 stops17h 25mBritish Airways
Mon 12/112:15 pmORD - OPO
2 stops13h 25mBritish Airways
Deal found 4/30$722

Cheapflights Fare Finder

Customize your flight search to find flights from Portugal 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 May 1, 2025.
Use the filters below to find and compare flights from Portugal to Illinois that are best for you.

Fly from

Portugal

Fly to

Illinois

Route

Depart

Return

Price

LisbonChicago

LIS - ORD

LISORD

Lisbon Humberto Delgado

Fri 5/16

6:35 am-2:15 pm

1 stop13h 40m

Chicago O'Hare Intl

Thu 5/29

10:25 pm-11:05 pm

1 stop18h 40m

$665

LisbonChicago

LIS - ORD

LISORD

Lisbon Humberto Delgado

Fri 5/16

5:00 am-2:10 pm

1 stop15h 10m

Chicago O'Hare Intl

Thu 5/29

1:45 pm-11:15 am

2 stops15h 30m

$676

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 5/15

8:15 am-2:15 pm

1 stop12h 00m

Chicago O'Hare Intl

Wed 5/28

11:45 am-7:35 am

2 stops13h 50m

$681

LisbonChicago

LIS - ORD

LISORD

Lisbon Humberto Delgado

Thu 5/29

7:30 pm-2:10 pm

1 stop24h 40m

Chicago O'Hare Intl

Thu 6/5

4:20 pm-10:55 am

1 stop12h 35m

$681

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

$691

LisbonChicago

LIS - ORD

LISORD

Lisbon Humberto Delgado

Mon 6/9

11:05 am-4:55 pm

1 stop11h 50m

Chicago O'Hare Intl

Wed 7/9

7:00 am-9:05 am

1 stop20h 05m

$692

LisbonChicago

LIS - MDW

LISMDW

Lisbon Humberto Delgado

Mon 6/9

5:40 am-6:41 pm

2 stops19h 01m

Chicago Midway

Tue 6/24

6:20 pm-6:40 pm

2 stops18h 20m

$693

LisbonChicago

LIS - ORD

LISORD

Lisbon Humberto Delgado

Tue 6/10

6:35 am-2:15 pm

1 stop13h 40m

Chicago O'Hare Intl

Thu 7/10

9:15 pm-11:05 pm

1 stop19h 50m

$699

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 6/13

6:40 am-6:03 pm

2 stops17h 23m

Chicago O'Hare Intl

Mon 6/23

7:00 pm-3:35 pm

2 stops14h 35m

$702

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 5/15

9:55 am-6:15 pm

1 stop14h 20m

Chicago O'Hare Intl

Wed 5/28

11:45 am-7:35 am

2 stops13h 50m

$717

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 60 results
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Best time to book a flight from Portugal to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Portugal 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 Portugal to Illinois

What is the cheapest month to book a flight from Portugal to Illinois?

Currently, August is the cheapest month in which you can book a flight from Portugal to Illinois (average of $245). Flying from Portugal 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.

What is the cheapest time of day to fly from PT to IL?

Find hourly flight availability from Portugal to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 1, 2025.

When flying from Portugal to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 May 1, 2025.
To help decide which airline to fly from Portugal to Illinois, see what other customers have to say about Delta, KLM and Air Transat. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

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
7,934 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

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
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

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
Air Transat
7.8
Good
385 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

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
LOT
7.6
Good
1,069 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

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
Finnair
7.6
Good
1,275 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

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 Portugal to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    One-way options have recently been found by users for as low as $518 on Aer Lingus. Other airlines that offer cheap prices include TAP AIR PORTUGAL from $526 and Air Serbia from $595 one-way.

  • Can I find deals for flights from Portugal to Illinois that include hotel bookings?

    Yes. In addition to deals on Portugal to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portugal to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portugal to Illinois.

  • Can I find deals for business class flights from Portugal to Illinois?

    Yes. Cheapflights offers flight deals from Portugal 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 Portugal to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Portugal to Illinois (average of $245). Flying from Portugal 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 Portugal to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Portugal to Illinois

Discover the top 4 airlines that operate flights from Portugal 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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest$579Average$713FlexibilityNo cancel feeOn-timeN/A
TAP AIR PORTUGALCheapest$580Average$1,005FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$650Average$696FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$733Average$898FlexibilityNo cancel feeOn-time69%

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