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$242+ Cheap flights from O'Hare Intl (ORD) 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 12/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — OPO
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago O'Hare Intl to Porto are usually found in February or November, booked 44 days in advance, depart on a Friday or Sunday and return on a Thursday

Cheap flight deals from O'Hare Intl to Porto

Discover tips and strategies to find the most affordable flight options for your journey from O'Hare Intl (ORD) 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 September 11, 2025.

Round-trip from

$434
(United Airlines)

One-way from

$242
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$728
From Chicago O'Hare Intl to Porto
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One-way flight from Chicago O'Hare Intl to Porto
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Highest demand for flights based on searches. 15% potential increase in price ($122 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from O'Hare Intl to Porto

Cheapest flights from O'Hare Intl to Porto
Explore the most affordable flight options available from O'Hare Intl to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/11. 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 10/272:22 pmORD - OPO
1 stop14h 08mUnited Airlines
Wed 11/1212:35 pmOPO - ORD
2 stops17h 08mUnited Airlines
Deal found 9/11$434
This Gotogate deal was found by Cheapflights users on 9/10. 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 11/257:15 amORD - OPO
2 stops22h 00mMultiple Airlines
Tue 12/212:05 pmOPO - ORD
1 stop34h 15mMultiple Airlines
Deal found 9/10$435
This United Airlines deal was found by Cheapflights users on 9/10. 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 10/207:10 amORD - OPO
1 stop20h 35mUnited Airlines
Wed 11/512:35 pmOPO - ORD
2 stops17h 08mUnited Airlines
Deal found 9/10$436
This Gotogate deal was found by Cheapflights users on 9/10. 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.
Wed 11/2612:50 pmORD - OPO
2 stops17h 15mMultiple Airlines
Wed 12/312:10 pmOPO - ORD
1 stop34h 10mMultiple Airlines
Deal found 9/10$437
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 11/256:50 pmORD - OPO
1 stop34h 25mSWISS
Tue 12/212:05 pmOPO - ORD
1 stop34h 15mSWISS
Deal found 9/10$445
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 11/266:50 pmORD - OPO
1 stop34h 20mSWISS
Wed 12/312:10 pmOPO - ORD
1 stop34h 10mSWISS
Deal found 9/10$446
This United Airlines deal was found by Cheapflights users on 9/10. 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 11/1712:45 pmORD - OPO
2 stops14h 45mUnited Airlines
Tue 11/2512:35 pmOPO - ORD
1 stop13h 32mUnited Airlines
Deal found 9/10$448
This United Airlines deal was found by Cheapflights users on 9/9. 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 11/262:30 pmORD - OPO
1 stop13h 00mUnited Airlines
Tue 12/26:00 amOPO - ORD
1 stop13h 10mUnited Airlines
Deal found 9/9$450
This oojo deal was found by Cheapflights users on 9/10. 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.
Mon 11/176:50 pmORD - OPO
1 stop34h 25mSWISS
Tue 11/2512:05 pmOPO - ORD
1 stop34h 15mSWISS
Deal found 9/10$454

Cheapflights Fare Finder

 
Customize your flight search to find flights from O'Hare Intl 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 September 11, 2025.
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to Porto that are best for you.

Fly from

O'Hare Intl

Fly to

Porto

Route

Depart

Return

Price

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 10/27

2:22 pm-9:30 am

1 stop14h 08m

Porto

Wed 11/12

12:35 pm-8:07 pm

1 stop13h 32m

$434

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 10/20

7:10 am-9:45 am

1 stop20h 35m

Porto

Wed 11/5

12:35 pm-11:43 pm

2 stops17h 08m

$436

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/26

12:50 pm-12:05 pm

2 stops17h 15m

Porto

Wed 12/3

12:10 pm-4:20 pm

1 stop34h 10m

$437

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/26

6:50 pm-11:10 am

1 stop34h 20m

Porto

Wed 12/3

12:10 pm-4:20 pm

1 stop34h 10m

$447

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 11/17

12:45 pm-9:30 am

2 stops14h 45m

Porto

Tue 11/25

12:35 pm-8:07 pm

1 stop13h 32m

$448

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/26

2:30 pm-9:30 am

1 stop13h 00m

Porto

Tue 12/2

6:00 am-1:10 pm

1 stop13h 10m

$450

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 10/29

7:50 pm-6:35 pm

1 stop17h 45m

Porto

Sun 11/9

6:35 pm-4:20 pm

2 stops51h 45m

$463

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/26

9:00 am-9:30 am

2 stops18h 30m

Porto

Wed 12/3

6:00 am-11:43 pm

2 stops23h 43m

$464

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/26

11:14 am-10:30 am

2 stops17h 16m

Porto

Tue 12/2

6:05 am-9:46 pm

2 stops21h 41m

$479

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 12/7

7:49 pm-10:40 am

2 stops56h 51m

$242

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 16 results
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Best time to book a flight from O'Hare Intl to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from O'Hare Intl 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 Chicago O'Hare Intl Airport to Porto

How far ahead should I book a flight from Chicago O'Hare Intl Airport to Porto?

Use this chart to determine the optimal time to book a round-trip flight from O'Hare Intl to Porto. Price data was last updated on August 29, 2025.

The best time to book flights from Chicago O'Hare Intl Airport to Porto is 44 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to Porto?

Currently, January is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Porto (average of $523). Flying from Chicago O'Hare Intl Airport to Porto in June is currently the most expensive (average of $1,027). 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 ORD to OPO?

Find hourly flight availability from O'Hare Intl 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 September 11, 2025.

It’s typically best to fly out from Chicago O'Hare Intl Airport to Porto in the evening. Doing so could potentially save you 34% on the flight price compared to flying at noon, which is usually more expensive.

What is the cheapest day to fly from Chicago O'Hare Intl Airport to Porto?

Use this chart to determine the cheapest time to fly round-trip from O'Hare Intl to Porto. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Chicago O'Hare Intl Airport to Porto flight should consider departing on Wednesday evenings when fares are most often at their lowest. Wednesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 September 11, 2025.
Peruse reviews from past customers who have flown with KLM, United Airlines, and TAP AIR PORTUGAL from Chicago O'Hare Intl Airport to Porto to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,385 reviews

Entertainment

7.2

Food

7.3

Overall

7.8

Comfort

7.7

Boarding

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
KLM
7.8
Good
1,385 reviews
KLM
7.8
Good
1,385 reviews

Entertainment

7.2

Food

7.3

Overall

7.8

Comfort

7.7

Boarding

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
United Airlines
7.4
Good
8,937 reviews
KLM
7.8
Good
1,385 reviews

Entertainment

7.2

Food

7.3

Overall

7.8

Comfort

7.7

Boarding

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
TAP AIR PORTUGAL
7.1
Good
1,977 reviews
KLM
7.8
Good
1,385 reviews

Entertainment

7.2

Food

7.3

Overall

7.8

Comfort

7.7

Boarding

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
Iberia
7.0
Good
2,929 reviews
KLM
7.8
Good
1,385 reviews

Entertainment

7.2

Food

7.3

Overall

7.8

Comfort

7.7

Boarding

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
Lufthansa
6.8
Okay
7,409 reviews
KLM
7.8
Good
1,385 reviews

Entertainment

7.2

Food

7.3

Overall

7.8

Comfort

7.7

Boarding

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Related info for your journey

Find useful and relevant information for your journey from O'Hare Intl 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 Chicago O'Hare Intl?

    Porto (OPO), located 6.8 mi from the city center, is the airport you fly into when you book flights from Chicago O'Hare Intl to Porto. 10 airlines have flights to Porto from Chicago O'Hare Intl on a regular basis. Booking flights from Chicago O'Hare Intl to Porto should not be difficult; the airport handles an average of 0 inbound flights from Chicago O'Hare Intl per day.

  • How long is the flight from Chicago O'Hare Intl Airport to Porto?

    There are many flights that can get you from Chicago O'Hare Intl Airport to Porto in 14h 08m. Fly via United Airlines or SWISS to get the fastest option. Chicago O'Hare Intl Airport and Porto are separated by a distance of 3931 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Chicago O'Hare Intl Airport to Porto round-trip?

    Currently priced at $453, TAP AIR PORTUGAL will fly you from Chicago O'Hare Intl Airport to Porto and back. In addition to TAP AIR PORTUGAL, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Iberia and British Airways - these airlines can fly you to your destination from $472 and $504, respectively. Users have found that TAP AIR PORTUGAL is 33% cheaper than the other options available to this destination.

  • Where are the most common layover locations when flying from Chicago O'Hare Intl Airport to Porto?

    Of the flights from Chicago O'Hare Intl Airport to Porto that have layovers, most of them stop in Lisbon.

  • What are some popular things to do or see while on a layover in Lisbon?

    If you're on a layover in Lisbon and looking for things to do, consider visiting Chiado, Praça do Marquês de Pombal, or Londres. Travelers on a layover in Lisbon can visit Chiado, Praça do Marquês de Pombal, and Londres, by traveling 4.5 mi, 3.6 mi, and 2.3 mi, respectively after landing at Lisbon Humberto Delgado. Travelers can book a car rental at Lisbon Humberto Delgado for about $20 per day to make their sightseeing more efficient.

  • Where are the least popular layover locations for Chicago O'Hare Intl Airport to Porto flights?

    Chicago O'Hare Intl Airport to Porto flights have a layover in Madrid the least frequently.

  • Can I find deals for flights from O'Hare Intl to Porto that include hotel bookings?

    Yes. In addition to deals on O'Hare Intl to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from O'Hare Intl to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from O'Hare Intl to Porto.

  • Can I find deals for business class flights from O'Hare Intl to Porto?

    Yes. Cheapflights offers flight deals from O'Hare Intl 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 Chicago O'Hare Intl Airport to Porto?

    Currently, January is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Porto (average of $523). Flying from Chicago O'Hare Intl Airport to Porto in June is currently the most expensive (average of $1,027). 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 Porto?

Book flights to Porto if you plan to visit one of these locations
Aveiro
Arcos de Valdevez
Coimbra

Browse thousands of different options on Cheapflights for your next trip

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Top 10 airlines flying from O'Hare Intl to Porto

Discover the top 10 airlines that operate flights from O'Hare Intl 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$453Average$669FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$472Average$712FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$504Average$736FlexibilityNo cancel feeOn-time70%
KLMCheapest$525Average$698FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$553Average$657FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$553Average$728FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$554Average$724FlexibilityNo cancel feeOn-time71%
SWISSCheapest$558Average$756FlexibilityNo cancel feeOn-time79%
DeltaCheapest$639Average$828FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$646Average$732FlexibilityNo cancel feeOn-time67%

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