How often are flights from Chicago to Porto delayed?

Historically, on average around 100% of flights between Chicago and Porto have experienced a delay on any given week. The average delay length over the past 12 months has been 319 minutes.

Which layover airport offers the lowest fares from Chicago to Porto?

Flights via Zurich (ZRH) offer the lowest average round-trip price of $519.

Which layover airport has the shortest connection time from Chicago to Porto?

Newark (EWR) has the shortest average layover time for this route: 1h 08m.

Which layover airport has the shortest travel time from Chicago to Porto?

Flights connecting via Newark (EWR) have the shortest average one-way travel time: 10h 29m.

What day of the week experiences the fewest flight delays on this route?

Sunday is statistically the day of the week which experiences the fewest number of delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

Which airport is the most popular layover for flights between Chicago and Porto?

Lisbon (LIS) was the most common stop: 33% of momondo users choosing 1-stop flights on this route connected there.

What is the most punctual flight time for Chicago to Porto flights?

Generally, flights departing at night tend to experience fewer delays. Flights at night have, in the past, seen delays more frequently in comparison.

Which airline has the best punctuality record on Chicago to Porto flights?

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 100% of their flights experiencing any sort of delay.

What airlines fly to Porto?

United Airlines, TAP AIR PORTUGAL and Iberia are the top three most popular airlines that fly to Porto from Chicago according to our data. United Airlines is the first choice among our users, with 42% of people opting to fly with this airline when traveling to Porto. Keep in mind that there are 10 different airlines that fly to Porto on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Chicago to Porto Airport?

Prices for flights from Chicago to Porto Airport refresh daily.

How many operators does momondo search for flights from Chicago to Porto Airport?

As of November 2025, there are 10 operators available to choose from for flights from Chicago to Porto Airport.

How old do you have to be to fly from Chicago to Porto Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Chicago to Porto Airport.

What documentation or ID do you need to fly to Porto Airport?

The travel and health documents required for your trip to Porto Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Porto Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$200 Cheap Flights from Chicago to Porto in 2025/26

Q: What is the typical price of a round-trip flight between Chicago and Porto?

Prices are currently low for flights on this route. Typical prices usually range from $698 to $850. The lowest price recently found on this route was $437.

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Find the cheapest flights from Chicago to Porto

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One-way

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Cheap round-trip flights

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8:20 pm - 4:45 pmORD-OPO

15h 25m1 stop

10:25 am - 5:45 pmOPO-ORD

36h 20m1 stop

$437Scandinavian Airlines

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Sun, Mar 15 - Wed, Mar 25

9:45 pm - 8:00 pmORD-OPO

16h 15m2 stops

8:20 am - 2:55 pmOPO-ORD

12h 35m1 stop

$441Iberia

Find Deal

Tue, Feb 10 - Thu, Feb 19

5:40 pm - 11:45 amORD-OPO

12h 05m1 stop

8:20 am - 2:55 pmOPO-ORD

12h 35m1 stop

$445Iberia

Find Deal

Tue, Feb 10 - Thu, Feb 19

7:50 pm - 11:15 amORD-OPO

34h 25m1 stop

7:20 pm - 3:10 pmOPO-ORD

24h 50m2 stops

$454SWISS

Find Deal

Sun, Mar 15 - Wed, Mar 25

5:10 pm - 11:10 amORD-OPO

13h 00m1 stop

12:00 pm - 7:55 pmOPO-ORD

13h 55m1 stop

$456Multiple Airlines

Find Deal

Sun, Mar 22 - Tue, Mar 31

5:55 pm - 12:05 pmORD-OPO

13h 10m1 stop

12:40 pm - 3:00 pmOPO-ORD

31h 20m1 stop

$460Multiple Airlines

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Tue, Mar 17 - Thu, Mar 26

7:50 pm - 11:15 amORD-OPO

34h 25m1 stop

7:25 pm - 1:45 pmOPO-ORD

23h 20m1 stop

$463SWISS

Find Deal

Sun, Mar 15 - Tue, Mar 24

7:10 pm - 1:05 pmORD-OPO

11h 55m1 stop

6:00 pm - 2:45 pmOPO-ORD

26h 45m1 stop

$466TAP AIR PORTUGAL

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Wed, Jan 14 - Sat, Jan 24

1:26 pm - 10:30 amMDW-OPO

15h 04m2 stops

11:15 am - 9:56 amOPO-MDW

28h 41m2 stops

$492Delta

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Sun, Feb 8 - Thu, Feb 19

6:35 pm - 3:30 pmMDW-OPO

14h 55m2 stops

5:00 am - 6:40 pmOPO-MDW

19h 40m2 stops

$597Delta

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Sun, Mar 29 - Sun, Apr 5

SWISS flights from Chicago to Porto

Our best SWISS deals on Chicago to Porto flight tickets

SWISS

Mar 15

ORD7:50 pmChicago O'Hare Intl

34h 25m

1 stop

OPO11:15 amPorto

Mar 25

OPO7:20 pmPorto

24h 50m

2 stops

ORD3:10 pmChicago O'Hare Intl

$454

Find similar

SWISS

Mar 15

ORD7:50 pmChicago O'Hare Intl

34h 25m

1 stop

OPO11:15 amPorto

Mar 24

OPO7:25 pmPorto

23h 20m

1 stop

ORD1:45 pmChicago O'Hare Intl

$463

Find similar

SWISS

Mar 15

ORD7:50 pmChicago O'Hare Intl

34h 25m

1 stop

OPO11:15 amPorto

Mar 29

OPO7:20 pmPorto

26h 35m

1 stop

ORD3:55 pmChicago O'Hare Intl

$513

Find similar

Lufthansa flights from Chicago to Porto

Our best Lufthansa deals on Chicago to Porto flight tickets

Lufthansa

Feb 9

ORD6:00 pmChicago O'Hare Intl

12h 50m

1 stop

OPO12:50 pmPorto

Feb 17

OPO6:00 amPorto

15h 20m

1 stop

ORD3:20 pmChicago O'Hare Intl

$473

Find similar

Lufthansa

Mar 16

ORD7:00 pmChicago O'Hare Intl

12h 50m

1 stop

OPO12:50 pmPorto

Mar 25

OPO6:00 amPorto

13h 10m

1 stop

ORD2:10 pmChicago O'Hare Intl

$474

Find similar

Lufthansa

Jan 13

ORD6:00 pmChicago O'Hare Intl

12h 50m

1 stop

OPO12:50 pmPorto

Jan 18

OPO6:00 amPorto

15h 20m

1 stop

ORD3:20 pmChicago O'Hare Intl

$488

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Fly from

Fly to

Route

Depart

Return

Price

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 3/15

8:20 pm-4:45 pm

1 stop15h 25m

Porto

Wed 3/25

10:25 am-5:45 pm

1 stop36h 20m

$437

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 2/10

9:45 pm-8:00 pm

2 stops16h 15m

Porto

Thu 2/19

8:20 am-2:55 pm

1 stop12h 35m

$441

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 2/10

5:40 pm-11:45 am

1 stop12h 05m

Porto

Thu 2/19

8:20 am-2:55 pm

1 stop12h 35m

$445

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 3/15

7:50 pm-11:15 am

1 stop34h 25m

Porto

Wed 3/25

7:20 pm-3:10 pm

2 stops24h 50m

$454

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 3/22

5:10 pm-11:10 am

1 stop13h 00m

Porto

Tue 3/31

12:00 pm-7:55 pm

1 stop13h 55m

$456

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 3/17

5:55 pm-12:05 pm

1 stop13h 10m

Porto

Thu 3/26

12:40 pm-3:00 pm

1 stop31h 20m

$460

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 3/15

7:50 pm-11:15 am

1 stop34h 25m

Porto

Tue 3/24

7:25 pm-1:45 pm

1 stop23h 20m

$463

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 1/14

7:10 pm-1:05 pm

1 stop11h 55m

Porto

Sat 1/24

6:00 pm-2:45 pm

1 stop26h 45m

$466

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Sun 2/8

1:26 pm-10:30 am

2 stops15h 04m

Porto

Thu 2/19

11:15 am-9:56 am

2 stops28h 41m

$492

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Sun 3/29

6:35 pm-3:30 pm

2 stops14h 55m

Porto

Sun 4/5

5:00 am-6:40 pm

2 stops19h 40m

$597

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Chicago to Porto

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Delays

Layovers

What is the typical price of a round-trip flight between Chicago and Porto?

What is the cheapest month to fly to Porto?

The month of April is, on average, the cheapest month to fly to Porto from Chicago, with most prices found around $616. If you aren’t able to travel during the month of April, then book flights to Porto from Chicago during February instead. Flights to Porto in February, while not as cheap as those in April, still average around $628.

What is the cheapest day to depart on your flight to Porto?

The cheapest day to depart on your flight to Porto is on a Monday when prices can be found for as low as $708. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $808. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

What is the cheapest time of day to depart on your flight to Porto?

In the evening is the cheapest time of day to fly from Chicago to Porto when you can find flight prices for as low as $611. Flying to Porto in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,018 on average. Flights to Porto from Chicago at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to Porto?

You are more likely to see cheaper flights to Porto from Chicago when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $673 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from Chicago for as low as $622 on momondo.

How have Chicago to Porto flight prices changed over time?

As of November 2025, prices for Chicago to Porto flights are approximately 38% cheaper when compared to flights at the same time last year.

When to book flights from Chicago to Porto

Are you open to changing your travel dates? Check out the ideal times to fly from Chicago to Porto according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Chicago to Porto (CHI to OPO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago to Porto

Fastest flight time	11h 00m
Direct flights	None

The fastest flight from Chicago to Porto takes 11h 00m

There are no direct flights from Chicago to Porto. There are no popular flight routes from Chicago to Porto.

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How far is Chicago to Porto by plane?
A flight from Chicago to Porto will travel around 3927.7 mi. By plane, this route typically takes 10h 35m.
When did momondo last update prices for flights from Chicago to Porto Airport?
Prices for flights from Chicago to Porto Airport refresh daily.
How many operators does momondo search for flights from Chicago to Porto Airport?
As of November 2025, there are 10 operators available to choose from for flights from Chicago to Porto Airport.
How old do you have to be to fly from Chicago to Porto Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Chicago to Porto Airport.
What documentation or ID do you need to fly to Porto Airport?
The travel and health documents required for your trip to Porto Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Porto Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Chicago to Porto?
Based on momondo bookings for flights between Chicago and Porto, the leading airline is United Airlines, making up 37% of the total bookings. Other popular airlines include TAP AIR PORTUGAL with 31%, Iberia with 13%, and Lufthansa with 7%.

Best airlines flying from Chicago to Porto

Compare and see reviews for airlines that fly from Chicago to Porto with momondo

Airline	Rating	Free Cancellation	Price
TAP AIR PORTUGAL	PriceFrom $468	Free Cancellation	Rating 7.1 2,075 reviews	Search TAP AIR PORTUGAL flights
Iberia	PriceFrom $487	Free Cancellation	Rating 7.0 3,035 reviews	Search Iberia flights
British Airways	PriceFrom $504	Free Cancellation	Rating 6.7 7,539 reviews	Search British Airways flights
Lufthansa	PriceFrom $507	Free Cancellation	Rating 6.8 7,594 reviews	Search Lufthansa flights
KLM	PriceFrom $531	Free Cancellation	Rating 7.7 1,423 reviews	Search KLM flights
United Airlines	PriceFrom $544	Free Cancellation	Rating 7.4 9,046 reviews	Search United Airlines flights
American Airlines	PriceFrom $553	Free Cancellation	Rating 7.2 11,038 reviews	Search American Airlines flights
SWISS	PriceFrom $558	Free Cancellation	Rating 7.5 1,794 reviews	Search SWISS flights
Delta	PriceFrom $638	Free Cancellation	Rating 7.9 7,998 reviews	Search Delta flights
Air Canada	PriceFrom $646	Free Cancellation	Rating 7.1 10,481 reviews	Search Air Canada flights

Vila Nova de Gaia

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Aveiro

Braga

Matosinhos

Guimarães

Lamego

Esposende

Chaves

Viseu

Espinho

Ponte de Lima

Arcos de Valdevez

Pinhao

Curia

Penafiel

Mesao Frio

Mira

Baiao

Why use momondo?

Why should I use momondo to find a flight deal from Chicago to Porto?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Chicago to Porto. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Chicago to Porto with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Chicago to Porto flights to just show those with flexible booking policies.

How can momondo help me find flights from Chicago to Porto?

momondo provides multiple filters to help you find the best flight to Porto from Chicago. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Chicago to Porto right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Chicago to Porto flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Porto trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Cheap flights from Chicago to Porto from $200

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago to Porto departing on 1/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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How to get the cheapest flight ticket from Chicago to Porto

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Chicago and Porto?

What is the cheapest month to fly to Porto?

What is the cheapest day to depart on your flight to Porto?

What is the cheapest time of day to depart on your flight to Porto?

How far in advance should I book a flight to Porto?

How have Chicago to Porto flight prices changed over time?

As of November 2025, prices for Chicago to Porto flights are approximately 38% cheaper when compared to flights at the same time last year.

What airlines fly to Porto?

How often are flights from Chicago to Porto delayed?

Historically, on average around 100% of flights between Chicago and Porto have experienced a delay on any given week. The average delay length over the past 12 months has been 319 minutes.

What is the most punctual flight time for Chicago to Porto flights?

Generally, flights departing at night tend to experience fewer delays. Flights at night have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Sunday is statistically the day of the week which experiences the fewest number of delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Chicago to Porto flights?

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 100% of their flights experiencing any sort of delay.

Which airport is the most popular layover for flights between Chicago and Porto?

Lisbon (LIS) was the most common stop: 33% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Chicago to Porto?

Flights via Zurich (ZRH) offer the lowest average round-trip price of $519.

Which layover airport has the shortest travel time from Chicago to Porto?

Flights connecting via Newark (EWR) have the shortest average one-way travel time: 10h 29m.

Which layover airport has the shortest connection time from Chicago to Porto?

Newark (EWR) has the shortest average layover time for this route: 1h 08m.

When to book flights from Chicago to Porto

Cheap Chicago to Porto (CHI to OPO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago to Porto

Fastest flight time

Direct flights

How far is Chicago to Porto by plane?

When did momondo last update prices for flights from Chicago to Porto Airport?

How many operators does momondo search for flights from Chicago to Porto Airport?

How old do you have to be to fly from Chicago to Porto Airport?

What documentation or ID do you need to fly to Porto Airport?

What is the most popular airline from Chicago to Porto?

Best airlines flying from Chicago to Porto

Compare and see reviews for airlines that fly from Chicago to Porto with momondo

Traveling to a place near Porto?

Why use momondo?

Why should I use momondo to find a flight deal from Chicago to Porto?

Can I find flights from Chicago to Porto with flexible booking policies on momondo?

How can momondo help me find flights from Chicago to Porto?

I’m not ready to book a flight from Chicago to Porto right now. Can momondo alert me if prices change?

An easier way to manage your Porto trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Portugal

Airports servicing Portugal