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$337+ 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 3/2. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — OPO
Feb 4 — Feb 111
Tue 2/4
Tue 2/11
1 adult, Economy
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Cheap flight deals from Illinois to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Illinois (USIL) to Porto (OPO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$497
(Kiwi.com)

One-way from

$337
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$556
Provider with most accurate pricing for Chicago (CHI)-Porto flight deals.
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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. 24% potential increase in price ($227 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($27 potential savings vs. average RT price).
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Average for round-trip flights in January 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 January 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
Tue 3/47:05 pmORD - OPO
1 stop17h 25mSWISS
Tue 3/1112:05 pmOPO - ORD
1 stop34h 10mSWISS
Deal found 1/28$497
This Gotogate deal was found by Cheapflights users on 1/30. 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 3/411:35 amORD - OPO
2 stops18h 30mAir Canada
Tue 3/116:00 amOPO - ORD
2 stops18h 37mAir Canada
Deal found 1/30$511
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
Wed 2/269:25 pmORD - OPO
1 stop20h 10mMultiple Airlines
Wed 3/57:20 pmOPO - ORD
1 stop26h 55mMultiple Airlines
Deal found 1/29$513
This Cheapflightsfares deal was found by Cheapflights users on 1/29. 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 3/54:45 pmORD - OPO
1 stop17h 15mIberia
Wed 3/128:20 amOPO - ORD
1 stop12h 10mIberia
Deal found 1/29$518
This American Airlines deal was found by Cheapflights users on 1/30. 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 3/44:45 pmORD - OPO
1 stop17h 15mAmerican Airlines
Tue 3/118:20 amOPO - ORD
1 stop12h 10mAmerican Airlines
Deal found 1/30$534
This Delta deal was found by Cheapflights users on 1/28. 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 3/410:30 amORD - OPO
2 stops18h 00mDelta
Tue 3/116:00 amOPO - ORD
2 stops19h 44mDelta
Deal found 1/28$535
This Delta deal was found by Cheapflights users on 1/28. 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 3/49:33 amMDW - OPO
2 stops18h 57mDelta
Tue 3/116:00 amOPO - MDW
2 stops21h 23mDelta
Deal found 1/28$535
This United Airlines deal was found by Cheapflights users on 1/28. 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.
Tue 3/43:55 pmORD - OPO
1 stop17h 20mUnited Airlines
Tue 3/116:00 amOPO - ORD
2 stops42h 37mUnited Airlines
Deal found 1/28$539
This Cheapflightsfares deal was found by Cheapflights users on 1/30. 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.
Sun 3/164:55 pmORD - OPO
1 stop13h 40mLufthansa
Tue 4/16:00 amOPO - ORD
1 stop12h 55mLufthansa
Deal found 1/30$540
This FlightHub deal was found by Cheapflights users on 1/30. 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.
Mon 4/77:50 pmORD - OPO
1 stop38h 00mTurkish Airlines
Thu 4/1710:45 amOPO - ORD
1 stop29h 05mTurkish Airlines
Deal found 1/30$562
This FlightHub deal was found by Cheapflights users on 1/29. 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 10/56:00 pmORD - OPO
1 stop23h 00mTAP AIR PORTUGAL
Sat 10/119:00 amOPO - ORD
1 stop13h 30mTAP AIR PORTUGAL
Deal found 1/29$588
This Ovago deal was found by Cheapflights users on 1/28. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/259:15 pmORD - OPO
1 stop15h 25mBritish Airways
Sun 3/309:20 pmOPO - ORD
1 stop25h 40mBritish Airways
Deal found 1/28$650

Find flights from Illinois to Porto within your budget

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 January 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 3/4

7:05 pm-6:30 pm

1 stop17h 25m

Porto

Tue 3/11

12:05 pm-5:15 pm

1 stop34h 10m

$497

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 3/4

11:35 am-12:05 pm

2 stops18h 30m

Porto

Tue 3/11

6:00 am-7:37 pm

2 stops18h 37m

$511

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 2/26

9:25 pm-11:35 pm

1 stop20h 10m

Porto

Wed 3/5

7:20 pm-4:15 pm

1 stop26h 55m

$513

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 3/5

4:45 pm-4:00 pm

1 stop17h 15m

Porto

Wed 3/12

8:20 am-3:30 pm

1 stop12h 10m

$518

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 3/4

4:45 pm-4:00 pm

1 stop17h 15m

Porto

Tue 3/11

8:20 am-3:30 pm

1 stop12h 10m

$534

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 3/4

10:30 am-10:30 am

2 stops18h 00m

Porto

Tue 3/11

6:00 am-8:44 pm

2 stops19h 44m

$535

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Tue 3/4

9:33 am-10:30 am

2 stops18h 57m

Porto

Tue 3/11

6:00 am-10:23 pm

2 stops21h 23m

$535

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 3/4

3:55 pm-3:15 pm

1 stop17h 20m

Porto

Tue 3/11

6:00 am-7:37 pm

2 stops42h 37m

$539

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 3/18

4:55 pm-3:15 pm

1 stop17h 20m

Porto

Wed 3/26

6:00 am-2:25 pm

1 stop13h 25m

$549

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 4/28

7:50 pm-3:50 pm

1 stop38h 00m

Porto

Mon 5/12

10:45 am-9:50 am

1 stop29h 05m

$585

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/30

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.

Travel insights for flights from Illinois to Porto

Get recent, data-driven insights about flights from Illinois to Porto including ideal travel times, pricing trends, and more.

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 $1,091). 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 January 30, 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 January 30, 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
8,450 reviews

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

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
8,450 reviews
Delta
8.0
Very good
8,450 reviews

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

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
7.9
Good
278 reviews
Delta
8.0
Very good
8,450 reviews

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

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
1,335 reviews
Delta
8.0
Very good
8,450 reviews

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

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
7.5
Good
786 reviews
Delta
8.0
Very good
8,450 reviews

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

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
1,584 reviews
Delta
8.0
Very good
8,450 reviews

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

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 $413 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include Air Canada from $461 and Lufthansa from $505 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 $1,091). 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 January 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$415Average$628FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$468Average$768FlexibilityNo cancel feeOn-time71%
IberiaCheapest$487Average$718FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$506Average$831FlexibilityNo cancel feeOn-time70%
DeltaCheapest$519Average$826FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$528Average$838FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$534Average$816FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$612Average$1,029FlexibilityNo cancel feeOn-time69%
SWISSCheapest$616Average$826FlexibilityNo cancel feeOn-time79%
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