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

Lisbon (LIS) was the most common stop: 34% 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.

What is the cheapest airline that flies from Chicago to Porto?

SWISS, KLM, and United Airlines are the most popular carriers operating from Chicago to Porto

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 43% 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.

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 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 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.

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 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 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 January 2026, 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.

$232 Cheap Flights from Chicago to Porto in 2026

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Find the cheapest flights from Chicago to Porto

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One-way

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7:15 pm - 11:00 am

ORD

OPO

33h 45m

1 stop

5:55 pm - 4:10 pm

OPO

ORD

28h 15m

1 stop

$453Scandinavian Airlines

Mon, Apr 13 - Fri, Apr 17

7:10 pm - 6:00 pm

ORD

OPO

16h 50m

1 stop

5:00 am - 2:45 pm

OPO

ORD

15h 45m

1 stop

$461TAP AIR PORTUGAL

Wed, Jan 28 - Sun, Feb 1

7:10 pm - 3:05 pm

ORD

OPO

13h 55m

1 stop

6:55 am - 3:00 pm

OPO

ORD

14h 05m

1 stop

$462TAP AIR PORTUGAL

Wed, Feb 4 - Wed, Feb 11

7:15 pm - 11:00 am

ORD

OPO

33h 45m

1 stop

5:55 pm - 4:10 pm

OPO

ORD

28h 15m

1 stop

$473Scandinavian Airlines

Mon, Apr 13 - Fri, Apr 17

7:15 am - 12:05 pm

ORD

OPO

23h 50m

2 stops

6:00 am - 12:55 pm

OPO

ORD

12h 55m

1 stop

$495Multiple Airlines

Tue, Mar 24 - Tue, Mar 31

4:05 pm - 3:25 pm

ORD

OPO

17h 20m

1 stop

1:45 pm - 6:25 pm

OPO

ORD

34h 40m

1 stop

$497Lufthansa

Wed, Feb 4 - Mon, Feb 16

9:40 pm - 11:25 pm

ORD

OPO

19h 45m

1 stop

6:00 am - 7:25 pm

OPO

ORD

19h 25m

2 stops

$500Multiple Airlines

Tue, Apr 14 - Wed, Apr 22

6:14 pm - 3:25 pm

MDW

OPO

15h 11m

2 stops

4:10 pm - 5:45 pm

OPO

MDW

31h 35m

2 stops

$532KLM

Wed, Feb 4 - Wed, Feb 11

10:46 am - 10:30 am

MDW

OPO

17h 44m

2 stops

5:00 am - 6:36 pm

OPO

MDW

19h 36m

2 stops

$664Delta

Wed, Jan 28 - Sun, Feb 1

9:34 am - 10:30 am

MDW

OPO

18h 56m

2 stops

5:00 am - 5:37 pm

OPO

MDW

18h 37m

2 stops

$670Delta

Thu, Feb 26 - Thu, Mar 5

TAP AIR PORTUGAL flights from Chicago to Porto

Our best TAP AIR PORTUGAL deals on Chicago to Porto flight tickets

TAP AIR PORTUGAL

Jan 16

ORD8:15 pmChicago O'Hare Intl

14h 45m

1 stop

OPO5:00 pmPorto

Jan 31

OPO4:55 pmPorto

27h 50m

1 stop

ORD2:45 pmChicago O'Hare Intl

$455

TAP AIR PORTUGAL

Jan 28

ORD7:10 pmChicago O'Hare Intl

16h 50m

1 stop

OPO6:00 pmPorto

Feb 1

OPO5:00 amPorto

15h 45m

1 stop

ORD2:45 pmChicago O'Hare Intl

$461

TAP AIR PORTUGAL

Feb 4

ORD7:10 pmChicago O'Hare Intl

13h 55m

1 stop

OPO3:05 pmPorto

Feb 11

OPO6:55 amPorto

14h 05m

1 stop

ORD3:00 pmChicago O'Hare Intl

$462

Lufthansa flights from Chicago to Porto

Our best Lufthansa deals on Chicago to Porto flight tickets

Lufthansa

Feb 4

ORD4:05 pmChicago O'Hare Intl

17h 20m

1 stop

OPO3:25 pmPorto

Feb 16

OPO1:45 pmPorto

34h 40m

1 stop

ORD6:25 pmChicago O'Hare Intl

$497

Lufthansa

Mar 24

ORD5:05 pmChicago O'Hare Intl

13h 35m

1 stop

OPO11:40 amPorto

Mar 31

OPO6:00 amPorto

12h 55m

1 stop

ORD12:55 pmChicago O'Hare Intl

$509

Lufthansa

Feb 11

ORD9:50 pmChicago O'Hare Intl

19h 50m

1 stop

OPO11:40 pmPorto

Feb 25

OPO12:30 pmPorto

13h 35m

1 stop

ORD8:05 pmChicago O'Hare Intl

$513

Fly from

Fly to

Route

Depart

Return

Price

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 4/13

7:15 pm-11:00 am

1 stop33h 45m

Porto

Fri 4/17

5:55 pm-4:10 pm

1 stop28h 15m

$453

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 1/28

7:10 pm-6:00 pm

1 stop16h 50m

Porto

Sun 2/1

5:00 am-2:45 pm

1 stop15h 45m

$461

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 2/4

7:10 pm-3:05 pm

1 stop13h 55m

Porto

Wed 2/11

6:55 am-3:00 pm

1 stop14h 05m

$462

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 4/13

7:15 pm-11:00 am

1 stop33h 45m

Porto

Fri 4/17

5:55 pm-4:10 pm

1 stop28h 15m

$473

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 3/24

7:15 am-12:05 pm

2 stops23h 50m

Porto

Tue 3/31

6:00 am-12:55 pm

1 stop12h 55m

$495

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 2/4

4:05 pm-3:25 pm

1 stop17h 20m

Porto

Mon 2/16

1:45 pm-6:25 pm

1 stop34h 40m

$497

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 4/14

9:40 pm-11:25 pm

1 stop19h 45m

Porto

Wed 4/22

6:00 am-7:25 pm

2 stops19h 25m

$500

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 2/4

6:14 pm-3:25 pm

2 stops15h 11m

Porto

Wed 2/11

4:10 pm-5:45 pm

2 stops31h 35m

$532

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 1/28

10:46 am-10:30 am

2 stops17h 44m

Porto

Sun 2/1

5:00 am-6:36 pm

2 stops19h 36m

$664

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Thu 2/26

9:34 am-10:30 am

2 stops18h 56m

Porto

Thu 3/5

5:00 am-5:37 pm

2 stops18h 37m

$670

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 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 March instead. Flights to Porto in March, while not as cheap as those in April, still average around $650.

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 $671 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 $613 on momondo.

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	10h 35m
Direct flights	None

The fastest flight from Chicago to Porto takes 10h 35m

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

Search flight deals

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 January 2026, 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 39% of the total bookings. Other popular airlines include TAP AIR PORTUGAL with 32%, Iberia with 13%, and Lufthansa with 8%.

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 $480	Free Cancellation	Rating 7.1 2,119 reviews	Search TAP AIR PORTUGAL flights
Iberia	PriceFrom $488	Free Cancellation	Rating 7.0 3,086 reviews	Search Iberia flights
British Airways	PriceFrom $504	Free Cancellation	Rating 6.7 7,671 reviews	Search British Airways flights
Lufthansa	PriceFrom $507	Free Cancellation	Rating 6.8 7,711 reviews	Search Lufthansa flights
KLM	PriceFrom $531	Free Cancellation	Rating 7.7 1,437 reviews	Search KLM flights
United Airlines	PriceFrom $543	Free Cancellation	Rating 7.4 9,156 reviews	Search United Airlines flights
American Airlines	PriceFrom $553	Free Cancellation	Rating 7.2 11,120 reviews	Search American Airlines flights
SWISS	PriceFrom $558	Free Cancellation	Rating 7.5 1,847 reviews	Search SWISS flights
Delta	PriceFrom $638	Free Cancellation	Rating 7.9 8,040 reviews	Search Delta flights
Air Canada	PriceFrom $646	Free Cancellation	Rating 7.1 10,619 reviews	Search Air Canada flights

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Penafiel

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Mira

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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

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Cheap flights from Chicago to Porto from $232

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 3/15. 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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TAP AIR PORTUGAL flights from Chicago to Porto

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How to get the cheapest flight ticket from Chicago to Porto

What is the cheapest month to fly to Porto?

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

What is the cheapest airline that flies from Chicago to Porto?

SWISS, KLM, and United Airlines are the most popular carriers operating from Chicago to Porto

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: 34% 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