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$262+ 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 7/14. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — OPO
jun. 21 — jun. 281
sáb. 6/21
sáb. 6/28
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 junio 16, 2025.

Round-trip from

$695
(Delta)

One-way from

$262
(Mytrip)

Popular in

July

Cheapest in

November

Average price

$854
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 June 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 junio 16, 2025.

This American Airlines deal was found by Cheapflights users on 6/14. 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.
mar. 10/2811:46 amSTL - OPO
2 stops14h 54mAmerican Airlines
sáb. 11/88:40 pmOPO - STL
2 stops19h 14mAmerican Airlines
Deal found 6/14$663
This FlightHub deal was found by Cheapflights users on 6/14. 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.
mar. 10/2811:49 amSTL - OPO
2 stops21h 56mLufthansa
sáb. 11/84:15 pmOPO - STL
1 stop27h 40mLufthansa
Deal found 6/14$673
This Delta deal was found by Cheapflights users on 6/16. 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.
mar. 7/154:20 pmORD - OPO
1 stop23h 55mDelta
mié. 7/239:20 amOPO - ORD
2 stops18h 23mDelta
Deal found 6/16$695
This Air Canada deal was found by Cheapflights users on 6/16. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 7/143:35 pmORD - OPO
1 stop12h 00mAir Canada
dom. 7/2011:20 amOPO - ORD
2 stops27h 49mAir Canada
Deal found 6/16$697
This KLM deal was found by Cheapflights users on 6/14. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 7/24:50 pmORD - OPO
1 stop23h 25mKLM
jue. 7/106:30 amOPO - ORD
1 stop13h 40mKLM
Deal found 6/14$699
This Kiwi.com deal was found by Cheapflights users on 6/14. 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.
dom. 8/316:00 pmORD - OPO
1 stop10h 55mTAP AIR PORTUGAL
sáb. 9/611:00 amOPO - ORD
1 stop11h 30mTAP AIR PORTUGAL
Deal found 6/14$701
This United Airlines deal was found by Cheapflights users on 6/16. 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.
mié. 8/133:35 pmORD - OPO
1 stop11h 45mUnited Airlines
dom. 8/176:00 amOPO - ORD
1 stop35h 00mUnited Airlines
Deal found 6/16$707
This Iberia deal was found by Cheapflights users on 6/16. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/2510:25 pmORD - OPO
1 stop27h 10mIberia
sáb. 9/68:15 amOPO - ORD
2 stops17h 30mIberia
Deal found 6/16$714
This Air France deal was found by Cheapflights users on 6/15. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/87:21 pmMDW - OPO
2 stops14h 14mKLM
mié. 7/166:15 amOPO - MDW
2 stops17h 24mKLM
Deal found 6/15$714
This Expedia deal was found by Cheapflights users on 6/15. 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.
mié. 7/161:01 pmORD - OPO
2 stops14h 19mMultiple Airlines
mié. 7/238:40 amOPO - ORD
1 stop13h 15mMultiple Airlines
Deal found 6/15$715
This Turkish Airlines deal was found by Cheapflights users on 6/15. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/267:50 pmORD - OPO
1 stop38h 20mTurkish Airlines
vie. 10/1010:45 amOPO - ORD
1 stop28h 55mTurkish Airlines
Deal found 6/15$717
This SWISS deal was found by Cheapflights users on 6/16. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 7/147:05 pmORD - OPO
2 stops36h 40mSWISS
lun. 7/217:50 pmOPO - ORD
2 stops46h 20mSWISS
Deal found 6/16$718

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 junio 16, 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

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

mar. 10/28

11:46 am-7:40 am

2 stops14h 54m

Porto

sáb. 11/8

8:40 pm-9:54 am

2 stops19h 14m

$663

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

mar. 10/28

11:49 am-2:45 pm

2 stops21h 56m

Porto

sáb. 11/8

4:15 pm-1:55 pm

1 stop27h 40m

$673

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mar. 7/15

4:20 pm-10:15 pm

1 stop23h 55m

Porto

mié. 7/23

9:20 am-9:43 pm

2 stops18h 23m

$695

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

lun. 7/14

3:35 pm-9:35 am

1 stop12h 00m

Porto

dom. 7/20

11:20 am-9:09 am

2 stops27h 49m

$697

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mié. 7/2

4:50 pm-10:15 pm

1 stop23h 25m

Porto

jue. 7/10

6:30 am-2:10 pm

1 stop13h 40m

$699

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

dom. 8/31

6:00 pm-10:55 am

1 stop10h 55m

Porto

sáb. 9/6

11:00 am-4:30 pm

1 stop11h 30m

$701

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mié. 8/13

3:35 pm-9:20 am

1 stop11h 45m

Porto

dom. 8/17

6:00 am-11:00 am

1 stop35h 00m

$707

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

lun. 8/25

10:25 pm-7:35 am

1 stop27h 10m

Porto

sáb. 9/6

8:15 am-7:45 pm

2 stops17h 30m

$714

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

mar. 7/8

7:21 pm-3:35 pm

2 stops14h 14m

Porto

mié. 7/16

6:15 am-5:39 pm

2 stops17h 24m

$714

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mié. 7/16

1:01 pm-9:20 am

2 stops14h 19m

Porto

mié. 7/23

8:40 am-3:55 pm

1 stop13h 15m

$715

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/16

Showing 1-10 of 44 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 $1,040). 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 junio 16, 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 junio 16, 2025.
Read through reviews of airlines operating flights from Illinois to Porto, such as Delta, KLM and Air Transat. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,963 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

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
7,963 reviews
Delta
8.0
Very good
7,963 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

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
1,361 reviews
Delta
8.0
Very good
7,963 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

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 Transat
7.8
Good
398 reviews
Delta
8.0
Very good
7,963 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

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
1,628 reviews
Delta
8.0
Very good
7,963 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

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!
Aeromexico
7.5
Good
1,711 reviews
Delta
8.0
Very good
7,963 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

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 $262 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include Air Canada from $436 and United Airlines from $463 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 $1,040). 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 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 junio 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$415Average$617FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$468Average$730FlexibilityNo cancel feeOn-time71%
IberiaCheapest$472Average$700FlexibilityNo cancel feeOn-time77%
DeltaCheapest$498Average$734FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$504Average$736FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$535Average$724FlexibilityNo cancel feeOn-time76%
SWISSCheapest$558Average$752FlexibilityNo cancel feeOn-time79%
KLMCheapest$563Average$796FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$569Average$795FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$646Average$732FlexibilityNo cancel feeOn-time67%

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