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 Frankfurt am Main (FRA) offer the lowest average round-trip price of $629.

What airlines fly to Porto?

United Airlines, TAP AIR PORTUGAL and Lufthansa 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 8 different airlines that fly to Porto on a routine basis, so you have a few additional options to choose from.

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.

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

Scandinavian Airlines and United Airlines are the most popular carriers operating from Chicago to Porto

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

Lisbon (LIS) was the most common stop: 35% of momondo users choosing 1-stop flights on this route connected there.

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 February 2026, there are 8 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.

$231 Cheap Flights from Chicago to Porto in 2026

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7:15 pm - 5:40 pm

ORD

OPO

16h 25m

1 stop

6:20 pm - 4:10 pm

OPO

ORD

27h 50m

1 stop

$483Scandinavian Airlines

Sat, Apr 11 - Sun, Apr 26

7:15 pm - 5:40 pm

ORD

OPO

16h 25m

1 stop

6:20 pm - 4:10 pm

OPO

ORD

27h 50m

1 stop

$505Scandinavian Airlines

Sat, Apr 11 - Sun, Apr 19

7:15 pm - 11:00 am

ORD

OPO

33h 45m

1 stop

5:55 pm - 4:10 pm

OPO

ORD

28h 15m

1 stop

$517Scandinavian Airlines

Mon, Apr 13 - Fri, Apr 17

6:00 pm - 10:55 am

ORD

OPO

10h 55m

1 stop

5:05 am - 4:00 pm

OPO

ORD

16h 55m

1 stop

$519TAP AIR PORTUGAL

Sun, Apr 12 - Wed, Apr 22

6:00 pm - 11:00 am

ORD

OPO

11h 00m

1 stop

9:00 am - 4:00 pm

OPO

ORD

13h 00m

1 stop

$520TAP AIR PORTUGAL

Wed, Apr 22 - Wed, Apr 29

8:15 pm - 4:05 pm

ORD

OPO

13h 50m

1 stop

8:55 am - 4:00 pm

OPO

ORD

12h 05m

1 stop

$521TAP AIR PORTUGAL

Fri, Mar 6 - Wed, Mar 11

6:00 pm - 10:55 am

ORD

OPO

10h 55m

1 stop

9:00 am - 4:00 pm

OPO

ORD

13h 00m

1 stop

$523TAP AIR PORTUGAL

Sun, Apr 26 - Sun, May 3

6:34 pm - 6:10 pm

MDW

OPO

17h 36m

2 stops

5:00 am - 5:58 pm

OPO

MDW

18h 58m

2 stops

$595Delta

Sun, Apr 12 - Wed, Apr 22

6:34 pm - 3:25 pm

MDW

OPO

14h 51m

2 stops

5:00 am - 5:58 pm

OPO

MDW

18h 58m

2 stops

$616Multiple Airlines

Wed, Apr 8 - Wed, Apr 15

6:34 pm - 6:10 pm

MDW

OPO

17h 36m

2 stops

6:15 am - 5:58 pm

OPO

MDW

17h 43m

2 stops

$628Delta

Sun, Apr 12 - Tue, Apr 21

KLM flights from Chicago to Porto

Our best KLM deals on Chicago to Porto flight tickets

KLM

Apr 13

ORD4:50 pmChicago O'Hare Intl

23h 25m

1 stop

OPO10:15 pmPorto

Apr 20

OPO4:20 pmPorto

27h 55m

1 stop

ORD2:15 pmChicago O'Hare Intl

$581

KLM

Mar 23

ORD5:25 pmChicago O'Hare Intl

20h 25m

1 stop

OPO6:50 pmPorto

Mar 30

OPO7:00 pmPorto

25h 15m

1 stop

ORD2:15 pmChicago O'Hare Intl

$582

KLM

Apr 27

ORD4:50 pmChicago O'Hare Intl

16h 40m

1 stop

OPO3:30 pmPorto

May 4

OPO4:20 pmPorto

28h 50m

1 stop

ORD3:10 pmChicago O'Hare Intl

$601

Delta flights from Chicago to Porto

Our best Delta deals on Chicago to Porto flight tickets

Delta

Apr 14

ORD1:36 pmChicago O'Hare Intl

19h 49m

2 stops

OPO3:25 pmPorto

Apr 24

OPO5:00 amPorto

15h 15m

1 stop

ORD2:15 pmChicago O'Hare Intl

$580

Delta

Apr 12

ORD7:14 pmChicago O'Hare Intl

16h 56m

2 stops

OPO6:10 pmPorto

Apr 21

OPO5:00 amPorto

15h 15m

1 stop

ORD2:15 pmChicago O'Hare Intl

$586

Delta

Apr 14

ORD5:04 pmChicago O'Hare Intl

16h 21m

2 stops

OPO3:25 pmPorto

Apr 22

OPO5:00 amPorto

21h 40m

2 stops

ORD8:40 pmChicago O'Hare Intl

$590

Fly from

Fly to

Route

Depart

Return

Price

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sat 4/11

7:15 pm-5:40 pm

1 stop16h 25m

Porto

Sun 4/26

6:20 pm-4:10 pm

1 stop27h 50m

$483

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sat 4/11

7:15 pm-5:40 pm

1 stop16h 25m

Porto

Sun 4/19

6:20 pm-4:10 pm

1 stop27h 50m

$505

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

$517

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 4/12

6:00 pm-10:55 am

1 stop10h 55m

Porto

Wed 4/22

5:05 am-4:00 pm

1 stop16h 55m

$519

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 4/22

6:00 pm-11:00 am

1 stop11h 00m

Porto

Wed 4/29

9:00 am-4:00 pm

1 stop13h 00m

$520

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 3/6

8:15 pm-4:05 pm

1 stop13h 50m

Porto

Wed 3/11

8:55 am-4:00 pm

1 stop12h 05m

$521

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 4/26

6:00 pm-10:55 am

1 stop10h 55m

Porto

Sun 5/3

9:00 am-4:00 pm

1 stop13h 00m

$523

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Sun 4/12

6:34 pm-6:10 pm

2 stops17h 36m

Porto

Wed 4/22

5:00 am-5:58 pm

2 stops18h 58m

$595

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 4/8

6:34 pm-3:25 pm

2 stops14h 51m

Porto

Wed 4/15

5:00 am-5:58 pm

2 stops18h 58m

$616

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Sun 4/12

6:34 pm-6:10 pm

2 stops17h 36m

Porto

Tue 4/21

6:15 am-5:58 pm

2 stops17h 43m

$628

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

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 $694 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 $479 on momondo.

Can stopping save me money on Chicago to Porto flights?

You could potentially save up to 16% on your flight if you consider stops on a Chicago to Porto flight.

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 February 2026, there are 8 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 41% of the total bookings. Other popular airlines include TAP AIR PORTUGAL with 33%, Iberia with 13%, and Lufthansa with 9%.

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 $450	Free Cancellation	Rating 7.1 2,149 reviews	Search TAP AIR PORTUGAL flights
Iberia	PriceFrom $501	Free Cancellation	Rating 7.0 3,123 reviews	Search Iberia flights
Lufthansa	PriceFrom $507	Free Cancellation	Rating 6.8 7,809 reviews	Search Lufthansa flights
KLM	PriceFrom $531	Free Cancellation	Rating 7.7 1,460 reviews	Search KLM flights
United Airlines	PriceFrom $549	Free Cancellation	Rating 7.4 9,346 reviews	Search United Airlines flights
American Airlines	PriceFrom $553	Free Cancellation	Rating 7.2 11,342 reviews	Search American Airlines flights
British Airways	PriceFrom $563	Free Cancellation	Rating 6.7 7,762 reviews	Search British Airways flights
Delta	PriceFrom $638	Free Cancellation	Rating 7.9 8,238 reviews	Search Delta flights

Vila Nova de Gaia

Coimbra

Matosinhos

Braga

Aveiro

Esposende

Lamego

Guimarães

Pinhao

Chaves

Espinho

Arcos de Valdevez

Viseu

Ponte de Lima

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

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Cheap flights from Chicago to Porto from $231

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 3/10. 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

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

Can stopping save me money on Chicago to Porto flights?

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

What airlines fly to Porto?

How often are flights from Chicago to Porto delayed?

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

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

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

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

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

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

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

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

Fly your favorite airline to Porto

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Porto

List of cabin classes available on flights landing in Porto. Availability may vary depending on flight origin and airline.

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