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Portugal

$224+ Cheap flights from Illinois to Portugal

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 3/2. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LIS
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from Illinois to Portugal

Cheapest flights from Illinois to Portugal
Explore the most affordable flight options available from Illinois to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

This United Airlines deal was found by Cheapflights users on 12/16. 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.
Sun 12/286:21 pmORD - LIS
1 stop9h 54mUnited Airlines
Tue 1/610:15 amLIS - ORD
1 stop12h 41mUnited Airlines
Deal found 12/16$546
This KAYAK deal was found by Cheapflights users on 12/16. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:30 pmORD - LIS
1 stop19h 50mIcelandair
Sun 1/119:20 pmLIS - ORD
1 stop26h 00mIcelandair
Deal found 12/16$582
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/264:20 pmORD - LIS
1 stop13h 10mUnited Airlines
Tue 1/610:15 amLIS - ORD
1 stop14h 00mUnited Airlines
Deal found 12/16$611
This Air France deal was found by Cheapflights users on 12/16. 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.
Tue 12/306:15 pmORD - LIS
1 stop32h 25mMultiple Airlines
Thu 1/811:25 amLIS - ORD
1 stop32h 55mMultiple Airlines
Deal found 12/16$632
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/292:30 pmORD - LIS
1 stop13h 45mUnited Airlines
Tue 1/610:15 amLIS - ORD
1 stop14h 00mUnited Airlines
Deal found 12/16$636
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/306:21 pmORD - LIS
1 stop9h 54mUnited Airlines
Mon 1/55:00 amLIS - ORD
1 stop21h 05mUnited Airlines
Deal found 12/16$669
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:55 pmORD - LIS
1 stop12h 55mBrussels Airlines
Sat 1/107:10 amLIS - ORD
2 stops33h 50mBrussels Airlines
Deal found 12/16$708
This Delta deal was found by Cheapflights users on 12/16. 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 12/296:35 amORD - LIS
2 stops19h 25mDelta
Sun 1/1110:00 amLIS - ORD
1 stop29h 49mDelta
Deal found 12/16$712
This Delta deal was found by Cheapflights users on 12/16. 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.
Wed 12/317:00 amORD - LIS
2 stops21h 35mDelta
Sun 1/1110:00 amLIS - ORD
1 stop29h 49mDelta
Deal found 12/16$718
This Expedia deal was found by Cheapflights users on 12/15. 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.
Mon 12/156:35 pmORD - OPO
2 stops17h 50mSWISS
Mon 12/227:20 pmOPO - ORD
1 stop27h 00mSWISS
Deal found 12/15$852
This Cheapflightsfares deal was found by Cheapflights users on 12/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/156:35 pmORD - OPO
1 stop17h 00mBritish Airways
Mon 12/228:40 pmOPO - ORD
1 stop24h 15mBritish Airways
Deal found 12/15$1,026
This KAYAK deal was found by Cheapflights users on 12/16. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/251:05 pmSTL - LIS
1 stop15h 10mLufthansa
Wed 12/315:00 amLIS - STL
1 stop14h 55mLufthansa
Deal found 12/16$1,066

Find flight deals from Illinois to Portugal

Keep the following information in mind while searching for Illinois to Portugal flight deals. Data was last updated December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$426
(oojo)

One-way from

$224
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$879

Good round-trip deal

$450 or less

Good one-way deal

$374 or less
Provider with most accurate pricing for Chicago (CHI)-Lisbon Humberto Delgado flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Lisbon Humberto Delgado flights.
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From Illinois to Portugal
Search Deals
One-way flight from Illinois to Portugal
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($152 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Illinois to Portugal.
Search Deals
Price to beat on a one-way flight from Illinois to Portugal.
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Portugal 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 December 18, 2025.
Use the filters below to find and compare flights from Illinois to Portugal that are best for you.

Fly from

Illinois

Fly to

Portugal

Route

Depart

Return

Price

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 4/15

6:00 pm-11:10 pm

1 stop23h 10m

Porto

Tue 4/21

9:15 pm-4:00 pm

1 stop24h 45m

$450

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 1/13

4:05 pm-11:40 am

1 stop13h 35m

Porto

Tue 1/20

6:00 am-9:13 am

2 stops33h 13m

$475

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 1/13

5:20 pm-10:30 am

1 stop11h 10m

Porto

Tue 1/20

9:55 am-2:20 pm

1 stop34h 25m

$478

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 3/2

11:15 am-9:30 am

2 stops16h 15m

Porto

Fri 3/13

12:30 pm-9:05 pm

1 stop13h 35m

$480

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 3/3

12:35 pm-9:30 am

2 stops14h 55m

Porto

Thu 3/19

6:00 am-2:25 pm

1 stop13h 25m

$480

ChicagoFaro

ORD - FAO

ORDFAO

Chicago O'Hare Intl

Fri 1/30

8:15 pm-3:45 pm

1 stop13h 30m

Faro

Fri 2/6

6:05 am-3:25 pm

1 stop15h 20m

$481

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 3/17

4:30 pm-9:30 am

1 stop12h 00m

Porto

Tue 3/24

6:00 am-11:44 pm

2 stops22h 44m

$486

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 1/18

5:59 pm-3:25 pm

2 stops15h 26m

Porto

Fri 1/30

5:00 am-2:20 pm

1 stop15h 20m

$489

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 2/4

3:35 pm-1:15 pm

2 stops15h 40m

Porto

Wed 2/11

6:00 am-10:05 pm

2 stops22h 05m

$489

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 3/3

2:03 pm-10:30 am

2 stops14h 27m

Porto

Wed 3/18

5:00 am-6:31 pm

2 stops18h 31m

$492

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

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

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

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

Currently, December is the cheapest month in which you can book a flight from Illinois to Portugal (average of $411). Flying from Illinois to Portugal in June is currently the most expensive (average of $691). 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 IL to PT?

Find hourly flight availability from Illinois to Portugal. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2025.

One of the essential ways to save on airfare from Illinois to Portugal is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the afternoon could potentially save you up to 16% on airfare.

What is the cheapest day to fly from Illinois to Portugal?

Use this chart to determine the cheapest time to fly round-trip from Illinois to Portugal. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Illinois to Portugal flight should consider departing on Wednesday evenings when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Portugal. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Illinois to Portugal?

    TAP AIR PORTUGAL, KLM, and United Airlines can get you from Illinois to Portugal in just under 11h 10m. Your travel time can differ by up to 12h. There are 3931 mi between Illinois and Portugal. Both multi-stop and nonstop flights can be found to your destination and back.

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

    For one-way options, check prices for British Airways. According to our data, you can fly for as low as $210. Users have also found prices from $245 and $264 on Icelandair and TAP AIR PORTUGAL, respectively.

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

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

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

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

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

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

    Currently, December is the cheapest month in which you can book a flight from Illinois to Portugal (average of $411). Flying from Illinois to Portugal in June is currently the most expensive (average of $691). 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 Illinois to Portugal

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Illinois to Portugal

Discover the top 10 airlines that operate flights from Illinois to Portugal. 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$369Average$472FlexibilityNo cancel feeOn-time77%
IcelandairCheapest$396Average$561FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$441Average$694FlexibilityNo cancel feeOn-time76%
Air FranceCheapest$470Average$648FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$480Average$833FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$488Average$754FlexibilityNo cancel feeOn-time77%
SWISSCheapest$489Average$705FlexibilityNo cancel feeOn-time79%
Aer LingusCheapest$494Average$912FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$503Average$600FlexibilityNo cancel feeOn-time72%
British AirwaysCheapest$504Average$1,077FlexibilityNo cancel feeOn-time70%

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