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$260+ 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 8/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — OPO
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
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Cheap flight deals from Illinois to Porto

Keep the following information in mind while searching for Illinois to Porto flight deals. Data was last updated July 3, 2025.

Round-trip from

$616
(FlightHub)

One-way from

$260
(Kiwi.com)

Popular in

July

Cheapest in

November

Average price

$908
From Illinois to Porto
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One-way flight from Illinois to Porto
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Highest demand for flights based on searches. 18% potential increase in price ($155 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($20 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 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 July 3, 2025.

This FlightHub deal was found by Cheapflights users on 7/2. 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.
Tue 9/167:50 pmORD - OPO
1 stop38h 00mTurkish Airlines
Wed 10/14:50 pmOPO - ORD
1 stop22h 50mTurkish Airlines
Deal found 7/2$616
This United Airlines deal was found by Cheapflights users on 7/2. 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 8/273:35 pmORD - OPO
1 stop11h 45mUnited Airlines
Thu 9/46:00 amOPO - ORD
1 stop14h 55mUnited Airlines
Deal found 7/2$618
This Air Canada deal was found by Cheapflights users on 7/2. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/76:06 pmORD - OPO
2 stops33h 29mAir Canada
Tue 9/2312:50 pmOPO - ORD
1 stop27h 01mAir Canada
Deal found 7/2$621
This Delta deal was found by Cheapflights users on 7/2. 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 12/31:00 pmMDW - OPO
2 stops15h 30mDelta
Sun 12/711:15 amOPO - MDW
2 stops37h 21mDelta
Deal found 7/2$622
This FlightHub deal was found by Cheapflights users on 7/2. 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.
Sun 8/318:25 pmORD - OPO
2 stops31h 10mMultiple Airlines
Wed 9/108:40 amOPO - ORD
1 stop13h 15mMultiple Airlines
Deal found 7/2$632
This Iberia deal was found by Cheapflights users on 7/2. 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.
Sun 9/710:25 pmORD - OPO
1 stop11h 30mIberia
Fri 9/268:15 amOPO - ORD
1 stop12h 00mIberia
Deal found 7/2$637
This Delta deal was found by Cheapflights users on 7/2. 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 8/185:00 pmORD - OPO
2 stops16h 30mDelta
Fri 8/296:40 amOPO - ORD
2 stops21h 13mDelta
Deal found 7/2$641
This FlightHub deal was found by Cheapflights users on 7/3. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/218:50 pmORD - OPO
1 stop30h 10mTAP AIR PORTUGAL
Sun 8/3110:30 pmOPO - ORD
1 stop24h 10mTAP AIR PORTUGAL
Deal found 7/3$645
This American Airlines deal was found by Cheapflights users on 7/2. 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 9/158:39 amORD - OPO
2 stops16h 56mAmerican Airlines
Tue 9/308:15 amOPO - ORD
2 stops19h 08mAmerican Airlines
Deal found 7/2$651
This Cheapflightsfares deal was found by Cheapflights users on 7/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1810:30 pmORD - OPO
2 stops18h 50mLufthansa
Fri 8/296:15 amOPO - ORD
2 stops19h 40mLufthansa
Deal found 7/3$656
This American Airlines deal was found by Cheapflights users on 7/2. 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.
Tue 10/2812:51 pmSTL - OPO
2 stops13h 49mAmerican Airlines
Sat 11/88:40 pmOPO - STL
2 stops18h 12mAmerican Airlines
Deal found 7/2$663
This FlightHub deal was found by Cheapflights users on 7/2. 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.
Tue 10/2811:49 amSTL - OPO
2 stops21h 56mLufthansa
Sat 11/84:15 pmOPO - STL
1 stop27h 40mLufthansa
Deal found 7/2$675

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 July 3, 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

Tue 9/16

7:50 pm-3:50 pm

1 stop38h 00m

Porto

Wed 10/1

4:50 pm-9:40 am

1 stop22h 50m

$616

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 8/27

3:35 pm-9:20 am

1 stop11h 45m

Porto

Thu 9/4

6:00 am-2:55 pm

1 stop14h 55m

$618

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 9/7

6:06 pm-9:35 am

2 stops33h 29m

Porto

Tue 9/23

12:50 pm-9:51 am

1 stop27h 01m

$621

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 12/3

1:00 pm-10:30 am

2 stops15h 30m

Porto

Sun 12/7

11:15 am-6:36 pm

2 stops37h 21m

$622

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 8/31

8:25 pm-9:35 am

2 stops31h 10m

Porto

Wed 9/10

8:40 am-3:55 pm

1 stop13h 15m

$632

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 9/7

10:25 pm-3:55 pm

1 stop11h 30m

Porto

Fri 9/26

8:15 am-2:15 pm

1 stop12h 00m

$637

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 8/18

5:00 pm-3:30 pm

2 stops16h 30m

Porto

Fri 8/29

6:40 am-9:53 pm

2 stops21h 13m

$641

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Thu 8/21

8:50 pm-9:00 am

1 stop30h 10m

Porto

Sun 8/31

10:30 pm-4:40 pm

1 stop24h 10m

$645

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 8/18

10:30 pm-11:20 pm

2 stops18h 50m

Porto

Fri 8/29

6:15 am-7:55 pm

2 stops19h 40m

$656

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Thu 8/7

4:30 pm-11:40 am

1 stop13h 10m

Porto

Thu 8/21

12:20 pm-11:59 pm

2 stops17h 39m

$663

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 36 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, January is the cheapest month in which you can book a flight from Illinois to Porto (average of $523). Flying from Illinois to Porto in June is currently the most expensive (average of $1,033). 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 July 3, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Porto as you normally would.

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. 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 Porto. Reviews last updated July 3, 2025.
Peruse reviews from past customers who have flown with Delta, Porter Airlines, and KLM from Illinois to Porto to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Porter Airlines
8.0
Very good
298 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,367 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air France
7.5
Good
1,465 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,654 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

  • 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 $266 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include Air Canada from $361 and American Airlines from $365 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, January is the cheapest month in which you can book a flight from Illinois to Porto (average of $523). Flying from Illinois to Porto in June is currently the most expensive (average of $1,033). 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 Illinois?

Book flights to Illinois if you plan to visit one of these locations
Aveiro
Coimbra
Matosinhos

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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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$415Average$638FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$468Average$725FlexibilityNo cancel feeOn-time71%
IberiaCheapest$473Average$699FlexibilityNo cancel feeOn-time77%
DeltaCheapest$498Average$734FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$504Average$736FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$535Average$704FlexibilityNo cancel feeOn-time76%
SWISSCheapest$558Average$726FlexibilityNo cancel feeOn-time79%
KLMCheapest$563Average$758FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$568Average$779FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$646Average$732FlexibilityNo cancel feeOn-time67%

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