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$322+ Cheap flights from Illinois to Porto (OPO)

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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — OPO
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from Illinois to Porto

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

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 Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/156:30 pmORD - OPO
3 stops33h 40mMultiple Airlines
Mon 12/221:15 pmOPO - ORD
2 stops26h 50mMultiple Airlines
Deal found 12/15$1,326
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2011:27 amORD - OPO
2 stops29h 28mMultiple Airlines
Sat 12/2710:35 amOPO - ORD
2 stops34h 10mMultiple Airlines
Deal found 12/16$1,391
This Ovago deal was found by Cheapflights users on 12/17. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/257:20 pmORD - OPO
1 stop15h 35mScandinavian Airlines
Tue 12/3011:25 amOPO - ORD
2 stops35h 20mScandinavian Airlines
Deal found 12/17$1,415
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.
Mon 12/227:40 pmORD - OPO
1 stop32h 00mMultiple Airlines
Mon 12/294:10 pmOPO - ORD
1 stop23h 55mMultiple Airlines
Deal found 12/16$1,429
This FlightHub deal was found by Cheapflights users on 12/17. 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.
Thu 12/258:20 pmORD - OPO
1 stop36h 50mTurkish Airlines
Tue 12/3010:50 amOPO - ORD
1 stop37h 35mTurkish Airlines
Deal found 12/17$1,443
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 12/233:35 pmORD - OPO
2 stops41h 50mUnited Airlines
Tue 12/3012:30 pmOPO - ORD
2 stops36h 22mUnited Airlines
Deal found 12/16$1,446
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 12/2211:08 amORD - OPO
2 stops21h 47mUnited Airlines
Mon 12/296:00 amOPO - ORD
2 stops23h 44mUnited Airlines
Deal found 12/16$1,464
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.
Thu 12/257:44 amMDW - OPO
2 stops25h 31mMultiple Airlines
Sat 1/38:50 amOPO - MDW
1 stop31h 20mMultiple Airlines
Deal found 12/16$2,037
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.
Tue 12/239:50 amMDW - OPO
2 stops18h 40mDelta
Tue 12/306:05 amOPO - MDW
2 stops22h 17mDelta
Deal found 12/16$2,396
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.
Fri 12/195:26 pmMDW - OPO
2 stops15h 59mDelta
Fri 12/267:35 amOPO - MDW
2 stops20h 47mDelta
Deal found 12/16$3,603

Find flight deals from Illinois to Porto

Keep the following information in mind while searching for Illinois to Porto 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

$322
(Kiwi.com)

Popular in

July

Cheapest in

April

Average price

$750
Provider with most accurate pricing for Chicago (CHI)-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Porto flights.
Search Deals
From Illinois to Porto
Search Deals
One-way flight from Illinois to Porto
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($106 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Porto 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 Porto that are best for you.

Fly from

Illinois

Fly to

Porto

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

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

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 3/17

12:15 pm-10:30 am

2 stops17h 15m

Porto

Tue 3/24

5:00 am-6:31 pm

2 stops18h 31m

$493

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Showing 1-10 of 45 results
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Best time to book a flight from Illinois to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto 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 Porto

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

Currently, November is the cheapest month in which you can book a flight from Illinois to Porto (average of $449). Flying from Illinois to Porto 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 OPO?

Find hourly flight availability from Illinois to Porto. 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 Porto is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 48% on airfare.

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

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

Travelers seeking maximum savings on their Illinois to Porto flight should consider departing on Wednesday evenings when fares are most often at their lowest. Saturday 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 Porto. 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 into for flights to Porto from Illinois?

    For a flight from Illinois to Porto, you will be flying into Porto. Porto (OPO) is just 6.8 mi from the center of the city.

  • How long is the flight from Illinois to Porto?

    A quick flight from Illinois to Porto can take about 11h 10m. TAP AIR PORTUGAL provides one of the quickest options available for as low as $478. Illinois and Porto are separated by a distance of 3931 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    One-way options have recently been found by users for as low as $264 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include United Airlines from $398 and Lufthansa from $543 one-way.

  • What are the most popular routes from Illinois to Porto?

    When deciding which route to take from Illinois to Porto consider Chicago O'Hare Intl - Porto, Chicago Midway - Porto or Lambert-St Louis - Porto as they are the most popular.

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

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

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

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

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

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

    Currently, November is the cheapest month in which you can book a flight from Illinois to Porto (average of $449). Flying from Illinois to Porto 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

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Aveiro
Arcos de Valdevez
Coimbra
Vila Nova de Gaia

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Alternative routes for Illinois to Porto

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 Porto

Discover the top 10 airlines that operate flights from Illinois to Porto. 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
TAP AIR PORTUGALCheapest$480Average$720FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$488Average$727FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$504Average$736FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$507Average$610FlexibilityNo cancel feeOn-time76%
KLMCheapest$531Average$681FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$544Average$721FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$553Average$719FlexibilityNo cancel feeOn-time71%
SWISSCheapest$558Average$725FlexibilityNo cancel feeOn-time79%
DeltaCheapest$638Average$779FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$646Average$713FlexibilityNo cancel feeOn-time67%

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