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$294+ 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 5/3. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — OPO
Mar 8 — Mar 151
Sun 3/8
Sun 3/15
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 February 6, 2026.

This lol.travel deal was found by Cheapflights users on 2/5. 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.
Sun 3/18:25 pm
ORD
-
OPO
1 stop12h 55m
TAP AIR PORTUGAL
Tue 3/178:00 pm
OPO
-
ORD
1 stop25h 00m
TAP AIR PORTUGAL
Deal found 2/5$472
This oojo deal was found by Cheapflights users on 2/3. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/47:10 pm
ORD
-
OPO
1 stop15h 50m
TAP AIR PORTUGAL
Wed 3/116:55 am
OPO
-
ORD
1 stop14h 05m
TAP AIR PORTUGAL
Deal found 2/3$473
This Mytrip deal was found by Cheapflights users on 2/4. 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.
Sun 3/18:25 pm
ORD
-
OPO
1 stop29h 35m
TAP AIR PORTUGAL
Thu 3/126:00 pm
OPO
-
ORD
1 stop27h 25m
TAP AIR PORTUGAL
Deal found 2/4$491
This United Airlines deal was found by Cheapflights users on 2/3. 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 4/197:45 am
STL
-
OPO
2 stops20h 00m
United Airlines
Tue 4/286:00 am
OPO
-
STL
2 stops34h 28m
United Airlines
Deal found 2/3$492
This oojo deal was found by Cheapflights users on 2/3. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/47:10 pm
ORD
-
OPO
1 stop11h 55m
TAP AIR PORTUGAL
Sun 3/88:55 am
OPO
-
ORD
1 stop11h 50m
TAP AIR PORTUGAL
Deal found 2/3$493
This Mytrip deal was found by Cheapflights users on 2/5. 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.
Sun 3/18:25 pm
ORD
-
OPO
2 stops20h 35m
Multiple Airlines
Tue 3/175:35 pm
OPO
-
ORD
2 stops27h 25m
Multiple Airlines
Deal found 2/5$499
This American Airlines deal was found by Cheapflights users on 2/6. 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.
Wed 4/1512:25 pm
STL
-
OPO
2 stops17h 20m
American Airlines
Wed 4/228:20 am
OPO
-
STL
2 stops17h 13m
American Airlines
Deal found 2/6$500
This oojo deal was found by Cheapflights users on 2/3. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/137:15 pm
ORD
-
OPO
1 stop33h 45m
Scandinavian Airlines
Fri 4/175:55 pm
OPO
-
ORD
1 stop28h 15m
Scandinavian Airlines
Deal found 2/3$501
This oojo deal was found by Cheapflights users on 2/3. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:00 pm
ORD
-
OPO
1 stop11h 00m
TAP AIR PORTUGAL
Wed 4/2210:00 am
OPO
-
ORD
1 stop12h 00m
TAP AIR PORTUGAL
Deal found 2/3$503
This United Airlines deal was found by Cheapflights users on 2/4. 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.
Wed 4/1510:00 am
STL
-
OPO
2 stops23h 40m
United Airlines
Wed 4/226:00 am
OPO
-
STL
2 stops21h 47m
United Airlines
Deal found 2/4$508
This oojo deal was found by Cheapflights users on 2/3. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/208:15 pm
ORD
-
OPO
1 stop19h 45m
TAP AIR PORTUGAL
Sat 2/288:00 pm
OPO
-
ORD
1 stop24h 45m
TAP AIR PORTUGAL
Deal found 2/3$513
This KAYAK deal was found by Cheapflights users on 2/4. 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.
Sun 4/195:21 pm
STL
-
OPO
2 stops20h 59m
British Airways
Tue 4/2812:25 pm
OPO
-
STL
2 stops26h 32m
British Airways
Deal found 2/4$524

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 February 6, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$472
(lol.travel)

One-way from

$294
(Kiwi.com)

Popular in

July

Cheapest in

April

Average price

$689
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. 11% potential increase in price ($90 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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 February 6, 2026.
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

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 4/19

7:45 am-9:45 am

2 stops20h 00m

Porto

Tue 4/28

6:00 am-10:28 am

2 stops34h 28m

$492

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 4/15

12:25 pm-11:45 am

2 stops17h 20m

Porto

Wed 4/22

8:20 am-7:33 pm

2 stops17h 13m

$500

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 4/13

7:15 pm-11:00 am

1 stop33h 45m

Porto

Fri 4/17

5:55 pm-4:10 pm

1 stop28h 15m

$501

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 4/15

10:00 am-3:40 pm

2 stops23h 40m

Porto

Wed 4/22

6:00 am-9:47 pm

2 stops21h 47m

$508

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 4/19

5:21 pm-8:20 pm

2 stops20h 59m

Porto

Tue 4/28

12:25 pm-8:57 am

2 stops26h 32m

$524

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 4/19

3:30 pm-11:25 pm

2 stops25h 55m

Porto

Tue 4/28

6:20 am-9:08 pm

2 stops20h 48m

$555

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 3/23

10:40 am-10:30 am

2 stops18h 50m

Porto

Tue 4/14

11:30 am-2:30 pm

1 stop33h 00m

$576

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 3/23

5:25 pm-10:25 pm

1 stop24h 00m

Porto

Wed 4/15

11:45 am-2:15 pm

1 stop32h 30m

$582

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Tue 3/24

1:10 pm-10:30 am

2 stops16h 20m

Porto

Wed 4/15

5:00 am-5:58 pm

2 stops18h 58m

$590

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Mon 3/23

1:10 pm-10:30 am

2 stops16h 20m

Porto

Wed 4/15

5:00 am-5:58 pm

2 stops18h 58m

$590

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/3

Showing 1-10 of 53 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 $690). 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.

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

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 15h 50m. TAP AIR PORTUGAL provides one of the quickest options available for as low as $473. 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 $130 on Iberia. Other airlines that offer cheap prices include TAP AIR PORTUGAL from $261 and United Airlines from $366 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 $690). 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
Vila Nova de Gaia
Aveiro
Arcos de Valdevez
Coimbra

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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 February 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$462Average$725FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$497Average$697FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$504Average$688FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$507Average$610FlexibilityNo cancel feeOn-time76%
KLMCheapest$531Average$679FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$549Average$723FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$553Average$719FlexibilityNo cancel feeOn-time71%
SWISSCheapest$558Average$756FlexibilityNo cancel feeOn-time79%
DeltaCheapest$638Average$746FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$646Average$713FlexibilityNo cancel feeOn-time67%

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