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$405+ 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 4/17. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — OPO
Apr 6 — Apr 131
Sun 4/6
Sun 4/13
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 April 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$551
(Gotogate)

One-way from

$405
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$618
Provider with most accurate pricing for Chicago (CHI)-Porto flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Porto flights.
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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. 23% potential increase in price ($220 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 1, 2025.

This Gotogate deal was found by Cheapflights users on 3/31. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/136:00 pmORD - OPO
1 stop31h 50mTAP AIR PORTUGAL
Tue 4/294:00 pmOPO - ORD
1 stop30h 10mTAP AIR PORTUGAL
Deal found 3/31$551
This American Airlines deal was found by Cheapflights users on 3/31. 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 10/152:55 pmORD - OPO
2 stops14h 45mAmerican Airlines
Fri 10/318:20 amOPO - ORD
2 stops17h 55mAmerican Airlines
Deal found 3/31$558
This United deal was found by Cheapflights users on 3/31. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/134:00 pmORD - OPO
1 stop17h 45mUnited Airlines
Tue 11/116:00 amOPO - ORD
2 stops23h 12mUnited Airlines
Deal found 3/31$562
This Expedia deal was found by Cheapflights users on 3/31. 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 5/511:45 amORD - OPO
2 stops26h 05mBritish Airways
Mon 5/1212:20 pmOPO - ORD
1 stop31h 55mBritish Airways
Deal found 3/31$564
This American Airlines deal was found by Cheapflights users on 4/1. 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.
Sun 5/111:22 pmORD - OPO
2 stops16h 18mMultiple Airlines
Wed 5/218:35 pmOPO - ORD
1 stop23h 40mMultiple Airlines
Deal found 4/1$565
This Lufthansa deal was found by Cheapflights users on 3/31. 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.
Sun 12/283:55 pmORD - OPO
1 stop17h 20mLufthansa
Thu 1/84:30 pmOPO - ORD
2 stops31h 51mLufthansa
Deal found 3/31$582
This Cheapflightsfares deal was found by Cheapflights users on 3/31. 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.
Wed 9/34:30 pmORD - OPO
1 stop13h 10mIberia
Tue 9/98:15 amOPO - ORD
1 stop12h 00mIberia
Deal found 3/31$586
This United Airlines deal was found by Cheapflights users on 4/1. 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.
Sat 10/254:30 pmSTL - OPO
2 stops41h 45mUnited Airlines
Mon 11/312:30 pmOPO - STL
2 stops32h 56mUnited Airlines
Deal found 4/1$599
This oojo deal was found by Cheapflights users on 4/1. 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 9/311:25 amORD - OPO
1 stop22h 25mTurkish Airlines
Tue 9/94:50 pmOPO - ORD
1 stop22h 50mTurkish Airlines
Deal found 4/1$603
This Gotogate deal was found by Cheapflights users on 3/31. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/66:35 pmORD - OPO
1 stop34h 50mSWISS
Wed 5/148:40 amOPO - ORD
1 stop13h 15mSWISS
Deal found 3/31$616
This Booking.com deal was found by Cheapflights users on 4/1. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/119:35 amORD - OPO
2 stops26h 40mAir Canada
Wed 5/216:00 amOPO - ORD
2 stops20h 12mAir Canada
Deal found 4/1$634
This Delta deal was found by Cheapflights users on 4/1. 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 4/285:59 pmMDW - OPO
2 stops15h 31mDelta
Mon 5/126:30 amOPO - MDW
2 stops20h 58mDelta
Deal found 4/1$644

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 1, 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

Sun 4/13

6:00 pm-7:50 am

1 stop31h 50m

Porto

Tue 4/29

4:00 pm-4:10 pm

1 stop30h 10m

$551

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 5/5

11:45 am-7:50 pm

2 stops26h 05m

Porto

Mon 5/12

12:20 pm-2:15 pm

1 stop31h 55m

$564

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 5/11

1:22 pm-11:40 am

2 stops16h 18m

Porto

Wed 5/21

8:35 pm-2:15 pm

1 stop23h 40m

$565

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 5/6

4:30 pm-7:35 am

1 stop33h 05m

Porto

Wed 5/14

8:15 am-2:15 pm

1 stop12h 00m

$590

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 5/11

2:20 pm-6:15 pm

1 stop21h 55m

Porto

Wed 5/21

12:20 pm-3:55 pm

1 stop33h 35m

$621

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 5/11

9:35 am-6:15 pm

2 stops26h 40m

Porto

Wed 5/21

6:00 am-8:12 pm

2 stops20h 12m

$634

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 4/27

4:30 pm-7:55 pm

1 stop21h 25m

Porto

Fri 5/9

8:15 am-10:52 pm

2 stops20h 37m

$636

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Mon 4/28

5:59 pm-3:30 pm

2 stops15h 31m

Porto

Mon 5/12

6:30 am-9:28 pm

2 stops20h 58m

$644

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 4/14

9:40 pm-11:25 pm

1 stop19h 45m

Porto

Thu 4/24

6:15 am-6:15 pm

1 stop18h 00m

$648

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 4/23

4:50 pm-10:40 am

1 stop11h 50m

Porto

Fri 5/2

6:40 am-2:10 pm

1 stop13h 30m

$651

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 38 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 $1,081). 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 1, 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 1, 2025.
Read through reviews of airlines operating flights from Illinois to Porto, such as Delta, KLM and Austrian Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

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
7,899 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

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
1,321 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

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
771 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

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.
SWISS
7.5
Good
1,572 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

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.
United Airlines
7.4
Good
8,615 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

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 $478 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include SWISS from $502 and American Airlines from $537 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

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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 9 airlines flying from Illinois to Porto

Discover the top 9 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 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$420Average$620FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$468Average$764FlexibilityNo cancel feeOn-time71%
IberiaCheapest$472Average$701FlexibilityNo cancel feeOn-time77%
DeltaCheapest$498Average$784FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$535Average$742FlexibilityNo cancel feeOn-time76%
SWISSCheapest$558Average$765FlexibilityNo cancel feeOn-time79%
KLMCheapest$563Average$811FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$584Average$864FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$648Average$733FlexibilityNo cancel feeOn-time67%

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