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 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.

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 has the shortest connection time from Chicago to Porto?

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

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

KLM, Air France, and Delta are the most popular carriers operating from Chicago to Porto

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 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 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 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 44% 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 offers the lowest fares from Chicago to Porto?

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

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.

$240 Cheap Flights from Chicago to Porto in 2026

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 $678 to $824. The lowest price recently found on this route was $453.

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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

Enter your travel dates to find the best prices.

7:15 pm - 11:00 am

ORD

OPO

33h 45m1 stop

5:55 pm - 4:10 pm

OPO

ORD

28h 15m1 stop

$453Scandinavian Airlines

Mon, Apr 13 - Fri, Apr 17

7:10 pm - 1:05 pm

ORD

OPO

11h 55m1 stop

8:55 am - 3:00 pm

OPO

ORD

12h 05m1 stop

$462TAP AIR PORTUGAL

Wed, Feb 4 - Wed, Feb 11

6:00 pm - 11:00 am

ORD

OPO

11h 00m1 stop

5:05 am - 4:15 pm

OPO

ORD

17h 10m1 stop

$479TAP AIR PORTUGAL

Wed, Apr 22 - Sat, Apr 25

7:15 pm - 11:00 am

ORD

OPO

33h 45m1 stop

5:55 pm - 4:10 pm

OPO

ORD

28h 15m1 stop

$482Scandinavian Airlines

Mon, Apr 20 - Fri, Apr 24

8:15 pm - 9:25 pm

ORD

OPO

19h 10m2 stops

4:05 pm - 2:45 pm

OPO

ORD

28h 40m2 stops

$501Multiple Airlines

Fri, Jan 16 - Sat, Jan 31

5:10 pm - 3:25 pm

ORD

OPO

16h 15m1 stop

11:45 am - 2:30 pm

OPO

ORD

32h 45m1 stop

$511Delta

Wed, Apr 22 - Tue, May 5

12:46 pm - 10:30 am

MDW

OPO

15h 44m2 stops

5:00 am - 5:29 pm

OPO

MDW

18h 29m2 stops

$527Multiple Airlines

Tue, Feb 3 - Tue, Feb 10

12:46 pm - 10:30 am

MDW

OPO

15h 44m2 stops

4:10 pm - 5:45 pm

OPO

MDW

31h 35m2 stops

$533KLM

Wed, Feb 4 - Wed, Feb 11

9:27 am - 10:55 am

MDW

OPO

19h 28m2 stops

6:15 am - 5:54 pm

OPO

MDW

17h 39m2 stops

$538Delta

Tue, Apr 21 - Tue, Apr 28

12:46 pm - 10:30 am

MDW

OPO

15h 44m2 stops

5:00 am - 5:29 pm

OPO

MDW

18h 29m2 stops

$633KLM

Thu, Feb 5 - Mon, Feb 9

Delta flights from Chicago to Porto

Our best Delta deals on Chicago to Porto flight tickets

Delta

Apr 22

ORD5:10 pmChicago O'Hare Intl

16h 15m

1 stop

OPO3:25 pmPorto

Apr 28

OPO11:45 amPorto

32h 45m

1 stop

ORD2:30 pmChicago O'Hare Intl

$511

Find similar

Delta

Feb 3

ORD5:20 pmChicago O'Hare Intl

11h 10m

1 stop

OPO10:30 amPorto

Feb 13

OPO5:00 amPorto

15h 20m

1 stop

ORD2:20 pmChicago O'Hare Intl

$512

Find similar

Delta

Apr 21

ORD5:10 pmChicago O'Hare Intl

22h 55m

1 stop

OPO10:05 pmPorto

May 6

OPO5:00 amPorto

15h 30m

1 stop

ORD2:30 pmChicago O'Hare Intl

$513

Find similar

KLM flights from Chicago to Porto

Our best KLM deals on Chicago to Porto flight tickets

KLM

Feb 4

ORD4:25 pmChicago O'Hare Intl

12h 05m

1 stop

OPO10:30 amPorto

Feb 11

OPO4:10 pmPorto

30h 31m

2 stops

ORD4:41 pmChicago O'Hare Intl

$528

Find similar

KLM

Feb 4

MDW12:46 pmChicago Midway

15h 44m

2 stops

OPO10:30 amPorto

Feb 11

OPO4:10 pmPorto

31h 35m

2 stops

MDW5:45 pmChicago Midway

$533

Find similar

KLM

Apr 13

ORD5:10 pmChicago O'Hare Intl

16h 15m

1 stop

OPO3:25 pmPorto

Apr 19

OPO7:00 pmPorto

25h 30m

1 stop

ORD2:30 pmChicago O'Hare Intl

$561

Find similar

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 2/4

7:10 pm-1:05 pm

1 stop11h 55m

Porto

Wed 2/11

8:55 am-3:00 pm

1 stop12h 05m

$462

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 4/22

6:00 pm-11:00 am

1 stop11h 00m

Porto

Sat 4/25

5:05 am-4:15 pm

1 stop17h 10m

$479

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 4/20

7:15 pm-11:00 am

1 stop33h 45m

Porto

Fri 4/24

5:55 pm-4:10 pm

1 stop28h 15m

$482

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 1/16

8:15 pm-9:25 pm

2 stops19h 10m

Porto

Sat 1/31

4:05 pm-2:45 pm

2 stops28h 40m

$501

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 4/22

5:10 pm-3:25 pm

1 stop16h 15m

Porto

Tue 5/5

11:45 am-2:30 pm

1 stop32h 45m

$511

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Tue 2/3

12:46 pm-10:30 am

2 stops15h 44m

Porto

Tue 2/10

5:00 am-5:29 pm

2 stops18h 29m

$527

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 2/4

12:46 pm-10:30 am

2 stops15h 44m

Porto

Wed 2/11

4:10 pm-5:45 pm

2 stops31h 35m

$533

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Tue 4/21

9:27 am-10:55 am

2 stops19h 28m

Porto

Tue 4/28

6:15 am-5:54 pm

2 stops17h 39m

$538

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Thu 2/5

12:46 pm-10:30 am

2 stops15h 44m

Porto

Mon 2/9

5:00 am-5:29 pm

2 stops18h 29m

$633

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 March instead. Flights to Porto in March, while not as cheap as those in April, still average around $648.

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 $670 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	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.

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 11h 00m.
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 38% of the total bookings. Other popular airlines include TAP AIR PORTUGAL with 32%, Iberia with 12%, 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 2,109 reviews	Search TAP AIR PORTUGAL flights
Iberia	PriceFrom $488	Free Cancellation	Rating 7.0 3,076 reviews	Search Iberia flights
British Airways	PriceFrom $504	Free Cancellation	Rating 6.7 7,657 reviews	Search British Airways flights
Lufthansa	PriceFrom $507	Free Cancellation	Rating 6.8 7,692 reviews	Search Lufthansa flights
KLM	PriceFrom $531	Free Cancellation	Rating 7.7 1,434 reviews	Search KLM flights
United Airlines	PriceFrom $543	Free Cancellation	Rating 7.4 9,138 reviews	Search United Airlines flights
American Airlines	PriceFrom $553	Free Cancellation	Rating 7.2 11,094 reviews	Search American Airlines flights
SWISS	PriceFrom $558	Free Cancellation	Rating 7.5 1,839 reviews	Search SWISS flights
Delta	PriceFrom $638	Free Cancellation	Rating 7.9 8,025 reviews	Search Delta flights
Air Canada	PriceFrom $646	Free Cancellation	Rating 7.1 10,602 reviews	Search Air Canada flights

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Pinhao

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Ponte de Lima

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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

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 $240

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 3/2. 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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Delta flights from Chicago to Porto

Our best Delta deals on Chicago to Porto flight tickets

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Our best KLM deals on Chicago to Porto flight tickets

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See travel insights to Porto from

How to get the cheapest flight ticket from Chicago to Porto

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

KLM, Air France, and Delta 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: 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