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 is the cheapest airline that flies from Chicago to Porto?

Iberia, SWISS, and Delta are the most popular carriers operating from Chicago to Porto

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.

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.

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: 36% 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.

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 46% 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.

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.

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 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.

$253 Cheap Flights from Chicago to Porto in 2026

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One-way

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Cheap round-trip flights

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7:10 pm - 10:00 pm

ORD

OPO

20h 50m

1 stop

6:55 am - 4:00 pm

OPO

ORD

14h 05m

1 stop

$474TAP AIR PORTUGAL

Wed, Mar 4 - Wed, Mar 11

8:15 pm - 7:00 pm

ORD

OPO

16h 45m

1 stop

6:55 am - 3:25 pm

OPO

ORD

14h 30m

1 stop

$494TAP AIR PORTUGAL

Fri, Feb 20 - Fri, Feb 27

7:15 pm - 11:00 am

ORD

OPO

33h 45m

1 stop

5:55 pm - 4:10 pm

OPO

ORD

28h 15m

1 stop

$502Scandinavian Airlines

Mon, Apr 13 - Fri, Apr 17

8:15 pm - 10:00 pm

ORD

OPO

19h 45m

1 stop

8:00 pm - 2:45 pm

OPO

ORD

24h 45m

1 stop

$513TAP AIR PORTUGAL

Fri, Feb 20 - Sat, Feb 28

8:15 pm - 5:00 pm

ORD

OPO

14h 45m

1 stop

4:55 pm - 2:45 pm

OPO

ORD

27h 50m

1 stop

$514TAP AIR PORTUGAL

Fri, Feb 20 - Sat, Feb 28

11:35 pm - 10:25 pm

ORD

OPO

17h 50m

1 stop

10:10 am - 1:20 pm

OPO

ORD

33h 10m

1 stop

$557Multiple Airlines

Sun, Mar 15 - Mon, Mar 30

7:15 am - 11:15 am

ORD

OPO

22h 00m

2 stops

6:00 am - 2:10 pm

OPO

ORD

13h 10m

1 stop

$562Multiple Airlines

Wed, Mar 4 - Wed, Mar 11

6:00 pm - 3:30 pm

ORD

OPO

15h 30m

1 stop

10:00 am - 4:00 pm

OPO

ORD

12h 00m

1 stop

$564TAP AIR PORTUGAL

Sun, Apr 12 - Fri, Apr 17

10:49 am - 10:30 am

MDW

OPO

17h 41m

2 stops

5:00 am - 10:31 pm

OPO

MDW

22h 31m

2 stops

$599Delta

Wed, Mar 4 - Wed, Mar 11

6:34 pm - 3:25 pm

MDW

OPO

14h 51m

2 stops

5:00 am - 5:58 pm

OPO

MDW

18h 58m

2 stops

$721Delta

Tue, Mar 31 - Tue, Apr 28

Turkish Airlines flights from Chicago to Porto

Our best Turkish Airlines deals on Chicago to Porto flight tickets

Turkish Airlines

Mar 18

ORD12:50 pmChicago O'Hare Intl

21h 20m

1 stop

OPO3:10 pmPorto

Mar 25

OPO4:10 pmPorto

23h 55m

1 stop

ORD11:05 amChicago O'Hare Intl

$574

Turkish Airlines

Mar 18

ORD12:50 pmChicago O'Hare Intl

21h 20m

1 stop

OPO3:10 pmPorto

Mar 25

OPO10:55 amPorto

29h 10m

1 stop

ORD11:05 amChicago O'Hare Intl

$578

Turkish Airlines

May 7

ORD8:10 pmChicago O'Hare Intl

21h 20m

1 stop

OPO11:30 pmPorto

May 14

OPO6:10 amPorto

18h 05m

1 stop

ORD6:15 pmChicago O'Hare Intl

$603

KLM flights from Chicago to Porto

Our best KLM deals on Chicago to Porto flight tickets

KLM

Mar 16

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

$583

KLM

Mar 18

ORD5:25 pmChicago O'Hare Intl

20h 55m

1 stop

OPO7:20 pmPorto

Mar 25

OPO5:00 amPorto

18h 31m

2 stops

ORD6:31 pmChicago O'Hare Intl

$594

KLM

Mar 17

ORD1:57 pmChicago O'Hare Intl

15h 33m

2 stops

OPO10:30 amPorto

Mar 31

OPO5:00 amPorto

16h 19m

2 stops

ORD3:19 pmChicago O'Hare Intl

$599

Fly from

Fly to

Route

Depart

Return

Price

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 3/4

7:10 pm-10:00 pm

1 stop20h 50m

Porto

Wed 3/11

6:55 am-4:00 pm

1 stop14h 05m

$474

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 2/20

8:15 pm-7:00 pm

1 stop16h 45m

Porto

Fri 2/27

6:55 am-3:25 pm

1 stop14h 30m

$494

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

$502

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 2/20

8:15 pm-10:00 pm

1 stop19h 45m

Porto

Sat 2/28

8:00 pm-2:45 pm

1 stop24h 45m

$513

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 2/20

8:15 pm-5:00 pm

1 stop14h 45m

Porto

Sat 2/28

4:55 pm-2:45 pm

1 stop27h 50m

$514

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 3/15

11:35 pm-10:25 pm

1 stop17h 50m

Porto

Mon 3/30

10:10 am-1:20 pm

1 stop33h 10m

$557

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 3/4

7:15 am-11:15 am

2 stops22h 00m

Porto

Wed 3/11

6:00 am-2:10 pm

1 stop13h 10m

$562

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 4/12

6:00 pm-3:30 pm

1 stop15h 30m

Porto

Fri 4/17

10:00 am-4:00 pm

1 stop12h 00m

$564

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 3/4

10:49 am-10:30 am

2 stops17h 41m

Porto

Wed 3/11

5:00 am-10:31 pm

2 stops22h 31m

$599

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Tue 3/31

6:34 pm-3:25 pm

2 stops14h 51m

Porto

Tue 4/28

5:00 am-5:58 pm

2 stops18h 58m

$721

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 $652.

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 $678 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 55m
Direct flights	None

The fastest flight from Chicago to Porto takes 10h 55m

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 55m.
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 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 40% 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 $462	Free Cancellation	Rating 7.1 2,133 reviews	Search TAP AIR PORTUGAL flights
Iberia	PriceFrom $497	Free Cancellation	Rating 7.0 3,102 reviews	Search Iberia flights
British Airways	PriceFrom $504	Free Cancellation	Rating 6.7 7,711 reviews	Search British Airways flights
Lufthansa	PriceFrom $507	Free Cancellation	Rating 6.8 7,758 reviews	Search Lufthansa flights
KLM	PriceFrom $531	Free Cancellation	Rating 7.7 1,448 reviews	Search KLM flights
United Airlines	PriceFrom $549	Free Cancellation	Rating 7.4 9,232 reviews	Search United Airlines flights
American Airlines	PriceFrom $553	Free Cancellation	Rating 7.2 11,215 reviews	Search American Airlines flights
SWISS	PriceFrom $558	Free Cancellation	Rating 7.6 1,864 reviews	Search SWISS flights
Delta	PriceFrom $638	Free Cancellation	Rating 7.9 8,138 reviews	Search Delta flights
Air Canada	PriceFrom $646	Free Cancellation	Rating 7.1 10,680 reviews	Search Air Canada flights

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Aveiro

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Esposende

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Pinhao

Arcos de Valdevez

Viseu

Ponte de Lima

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Penafiel

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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 $253

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 4/19. 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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Turkish Airlines flights from Chicago to Porto

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See travel insights to Porto from

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?

Iberia, SWISS, 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: 36% 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 Frankfurt am Main (FRA) offer the lowest average round-trip price of $629.

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