HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Porto

$280+ 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 7/27. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — OPO
Apr 30 — May 71
Wed 4/30
Wed 5/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Porto with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 April 25, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$615
(Delta)

One-way from

$341
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$616
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. 23% potential increase in price ($217 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 April 25, 2025.

This United Airlines deal was found by Cheapflights users on 4/24. 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 11/103:55 pmORD - OPO
1 stop13h 45mUnited Airlines
Wed 11/1912:30 pmOPO - ORD
1 stop13h 35mUnited Airlines
Deal found 4/24$559
This Iberia deal was found by Cheapflights users on 4/24. 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.
Tue 11/254:45 pmORD - OPO
1 stop13h 00mIberia
Tue 12/28:40 pmOPO - ORD
2 stops23h 15mIberia
Deal found 4/24$560
This Delta deal was found by Cheapflights users on 4/24. 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 11/119:30 amMDW - OPO
2 stops19h 20mDelta
Tue 11/185:00 amOPO - MDW
2 stops19h 07mDelta
Deal found 4/24$565
This CrystalTravel deal was found by Cheapflights users on 4/24. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/157:05 pmORD - OPO
1 stop17h 25mMultiple Airlines
Wed 10/226:15 amOPO - ORD
1 stop18h 00mMultiple Airlines
Deal found 4/24$569
This Delta deal was found by Cheapflights users on 4/24. 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 11/101:35 pmORD - OPO
2 stops19h 50mDelta
Tue 11/1811:15 amOPO - ORD
2 stops18h 38mDelta
Deal found 4/24$570
This Lufthansa deal was found by Cheapflights users on 4/24. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/103:55 pmORD - OPO
2 stops14h 55mLufthansa
Wed 11/196:00 amOPO - ORD
1 stop20h 05mLufthansa
Deal found 4/24$581
This Expedia deal was found by Cheapflights users on 4/23. 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.
Thu 11/134:45 pmORD - OPO
1 stop13h 00mBritish Airways
Thu 11/208:20 amOPO - ORD
1 stop12h 10mBritish Airways
Deal found 4/23$588
This oojo deal was found by Cheapflights users on 4/24. 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.
Sun 10/126:00 pmORD - OPO
1 stop19h 00mTAP AIR PORTUGAL
Fri 10/179:00 amOPO - ORD
1 stop13h 10mTAP AIR PORTUGAL
Deal found 4/24$593
This SWISS deal was found by Cheapflights users on 4/24. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/152:20 pmORD - OPO
1 stop15h 05mSWISS
Wed 10/2212:20 pmOPO - ORD
1 stop29h 50mSWISS
Deal found 4/24$597
This American Airlines deal was found by Cheapflights users on 4/24. 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 10/151:15 pmORD - OPO
2 stops16h 25mAmerican Airlines
Wed 10/228:15 amOPO - ORD
2 stops19h 10mAmerican Airlines
Deal found 4/24$602
This Air Canada deal was found by Cheapflights users on 4/24. 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.
Wed 9/178:40 amORD - OPO
1 stop18h 40mAir Canada
Tue 9/3012:50 pmOPO - ORD
2 stops28h 59mAir Canada
Deal found 4/24$610
This FlightHub deal was found by Cheapflights users on 4/25. 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 9/1811:25 amORD - OPO
1 stop22h 25mTurkish Airlines
Fri 9/2610:45 amOPO - ORD
1 stop28h 55mTurkish Airlines
Deal found 4/25$613

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 April 25, 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 10/15

7:05 pm-6:30 pm

1 stop17h 25m

Porto

Wed 10/22

6:15 am-6:15 pm

1 stop18h 00m

$569

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 10/12

6:00 pm-7:00 pm

1 stop19h 00m

Porto

Fri 10/17

9:00 am-4:10 pm

1 stop13h 10m

$593

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 10/15

7:05 pm-6:30 pm

1 stop17h 25m

Porto

Tue 10/21

8:40 am-3:55 pm

1 stop13h 15m

$597

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 10/15

1:15 pm-11:40 am

2 stops16h 25m

Porto

Wed 10/22

8:15 am-9:25 pm

2 stops19h 10m

$602

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 10/14

9:40 pm-11:20 pm

1 stop19h 40m

Porto

Tue 10/28

6:00 am-2:25 pm

1 stop13h 25m

$605

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 9/17

8:40 am-9:20 am

1 stop18h 40m

Porto

Tue 9/30

12:50 pm-11:49 am

2 stops28h 59m

$610

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Thu 9/18

11:25 am-3:50 pm

1 stop22h 25m

Porto

Fri 9/26

10:45 am-9:40 am

1 stop28h 55m

$613

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 9/23

4:50 pm-9:45 am

1 stop10h 55m

Porto

Tue 9/30

12:50 pm-11:49 am

2 stops28h 59m

$614

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 10/15

5:59 pm-3:30 pm

2 stops15h 31m

Porto

Wed 10/22

6:15 am-6:07 pm

2 stops17h 52m

$615

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 9/22

6:50 pm-11:00 am

2 stops34h 10m

Porto

Wed 10/1

11:50 am-4:10 pm

1 stop34h 20m

$635

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/24

Showing 1-10 of 46 results
1
2
3
...
5

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 $1,081). 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 April 25, 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.

Rainfall in Porto by month

Plan your trip to Porto by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Porto ranges from 0.7 - 7.7 inches per month. December is typically the wettest month, when rainfall can reach 7.7 in. July is typically the driest time to visit Porto when rainfall is around 0.7 in.

Temperature in Porto by month

Plan your trip to Porto by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Porto, 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 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

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 April 25, 2025.
Read through reviews of airlines operating flights from Illinois to Porto, such as Delta, Porter Airlines and KLM. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,920 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,920 reviews
Delta
8.0
Very good
7,920 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Porter Airlines
8.0
Very good
285 reviews
Delta
8.0
Very good
7,920 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,333 reviews
Delta
8.0
Very good
7,920 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air Transat
7.8
Good
385 reviews
Delta
8.0
Very good
7,920 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Austrian Airlines
7.6
Good
780 reviews
Delta
8.0
Very good
7,920 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 $356 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include SWISS from $502 and United Airlines from $521 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 $1,081). 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
Arcos de Valdevez

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to Porto

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Lisbon flights
Newark to Lisbon flights
Boston to Lisbon flights
LaGuardia to Lisbon flights
Dulles Intl to Lisbon flights
Newark to Porto flights
San Francisco to Lisbon flights
Miami to Lisbon flights
O'Hare Intl to Lisbon flights
Los Angeles to Lisbon flights
John F Kennedy Intl to Porto flights
Reagan-National to Lisbon flights
Boston to Ponta Delgada flights
Baltimore to Lisbon flights
John F Kennedy Intl to Ponta Delgada flights
Philadelphia to Lisbon flights
Dallas/Fort Worth to Lisbon flights
Seattle to Lisbon flights
Boston to Porto flights
LaGuardia to Porto flights
Newark to Ponta Delgada flights
Hobby to Lisbon flights
Atlanta to Lisbon flights
Denver to Lisbon flights
Midway to Lisbon flights
Sky Harbor Intl to Lisbon flights
Love Field to Lisbon flights
George Bush Intcntl to Lisbon flights
Dulles Intl to Porto flights
Portland to Lisbon flights
Reagan-National to Porto flights
John F Kennedy Intl to Funchal flights
John F Kennedy Intl to Faro flights
Newark to Faro flights
Minneapolis to Lisbon flights
Newark to Funchal flights
Orlando to Lisbon flights
O'Hare Intl to Porto flights
Baltimore to Porto flights
Charlotte to Lisbon flights
San Diego to Lisbon flights
Tampa to Lisbon flights
Seattle to Porto flights
Fort Lauderdale to Lisbon flights
San Francisco to Porto flights
Raleigh to Lisbon flights
St. Louis to Lisbon flights
Dallas/Fort Worth to Porto flights
Detroit to Lisbon flights
Austin to Lisbon flights

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 April 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$416Average$611FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$468Average$736FlexibilityNo cancel feeOn-time71%
IberiaCheapest$472Average$700FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$504Average$736FlexibilityNo cancel feeOn-time70%
DeltaCheapest$514Average$815FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$535Average$727FlexibilityNo cancel feeOn-time76%
SWISSCheapest$558Average$765FlexibilityNo cancel feeOn-time79%
KLMCheapest$563Average$796FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$584Average$837FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$646Average$732FlexibilityNo cancel feeOn-time67%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.