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

Delta and KLM 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 Lisbon (LIS) have the shortest average one-way travel time: 12h 03m.

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

Lisbon (LIS) was the most common stop: 65% of momondo users choosing 1-stop flights on this route connected there.

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

Frankfurt am Main (FRA) has the shortest average layover time for this route: 1h 41m.

What airlines fly to Porto?

TAP AIR PORTUGAL, United Airlines and Lufthansa are the top three most popular airlines that fly to Porto from Chicago according to our data. TAP AIR PORTUGAL is the first choice among our users, with 53% of people opting to fly with this airline when traveling to Porto. Keep in mind that there are 7 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 Amsterdam (AMS) offer the lowest average round-trip price of $777.

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 August 2026, there are 7 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.

$304 Cheap Flights from Chicago to Porto in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Chicago to Porto

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:00 pm - 6:55 pmORD Chicago O'Hare Intl-OPO Porto

18h 55m1 stop Lisbon Humberto Delgado

6:00 pm - 4:30 pmOPO Porto-ORD Chicago O'Hare Intl

27h 30m1 stop Lisbon Humberto Delgado

$632TAP AIR PORTUGAL

Thu, Oct 22 - Thu, Oct 29

6:00 pm - 12:40 amORD Chicago O'Hare Intl-OPO Porto

24h 40m1 stop Lisbon Humberto Delgado

11:00 am - 12:40 pmOPO Porto-ORD Chicago O'Hare Intl

31h 40m1 stop Lisbon Humberto Delgado

$633TAP AIR PORTUGAL

Wed, Oct 14 - Wed, Oct 21

7:00 pm - 3:00 pmORD Chicago O'Hare Intl-OPO Porto

14h 00m1 stop Lisbon Humberto Delgado

8:30 am - 3:30 pmOPO Porto-ORD Chicago O'Hare Intl

13h 00m1 stop Lisbon Humberto Delgado

$659JetBlue

Wed, Dec 2 - Wed, Dec 9

6:00 pm - 3:00 pmORD Chicago O'Hare Intl-OPO Porto

15h 00m1 stop Lisbon Humberto Delgado

9:00 am - 4:00 pmOPO Porto-ORD Chicago O'Hare Intl

13h 00m1 stop Lisbon Humberto Delgado

$659JetBlue

Sun, Sep 20 - Fri, Oct 2

11:45 am - 9:30 amORD Chicago O'Hare Intl-OPO Porto

15h 45m1 stop Newark

6:00 am - 3:20 pmOPO Porto-ORD Chicago O'Hare Intl

15h 20m1 stop Frankfurt am Main

$717United Airlines

Tue, Dec 1 - Fri, Dec 11

7:00 am - 9:30 amORD Chicago O'Hare Intl-OPO Porto

20h 30m1 stop Newark

6:00 am - 8:05 pmOPO Porto-ORD Chicago O'Hare Intl

20h 05m1 stop Frankfurt am Main

$717United Airlines

Sun, Nov 29 - Fri, Dec 11

8:10 pm - 3:40 pmORD Chicago O'Hare Intl-OPO Porto

37h 30m1 stop Istanbul

10:40 am - 9:40 amOPO Porto-ORD Chicago O'Hare Intl

29h 00m1 stop Istanbul

$747Turkish Airlines

Tue, Oct 13 - Tue, Oct 20

11:25 am - 3:40 pmORD Chicago O'Hare Intl-OPO Porto

22h 15m1 stop Istanbul

11:00 am - 9:40 amOPO Porto-ORD Chicago O'Hare Intl

28h 40m1 stop Istanbul

$753Turkish Airlines

Tue, Oct 6 - Thu, Oct 22

12:49 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

16h 56m2 stops Orlando Madrid Barajas

8:20 am - 2:55 pmOPO Porto-ORD Chicago O'Hare Intl

12h 35m1 stop Madrid Barajas

$759Iberia

Thu, Nov 19 - Wed, Nov 25

3:33 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

14h 12m2 stops Boston Logan Intl Madrid Barajas

8:40 pm - 4:49 pmOPO Porto-ORD Chicago O'Hare Intl

26h 09m2 stops Madrid Barajas New York John F Kennedy Intl

$764Iberia

Tue, Feb 2 - Mon, Feb 8

Cheap last minute flights

Enter your travel dates to find the best prices.

6:00 pm - 5:00 pmORD Chicago O'Hare Intl-OPO Porto

17h 00m1 stop Lisbon Humberto Delgado

7:00 am - 3:30 pmOPO Porto-ORD Chicago O'Hare Intl

14h 30m1 stop Lisbon Humberto Delgado

$769TAP AIR PORTUGAL

Sun, Aug 30 - Wed, Dec 9

6:00 pm - 8:35 pmORD Chicago O'Hare Intl-OPO Porto

20h 35m1 stop Lisbon Humberto Delgado

5:00 am - 3:30 pmOPO Porto-ORD Chicago O'Hare Intl

16h 30m1 stop Lisbon Humberto Delgado

$769TAP AIR PORTUGAL

Sun, Aug 30 - Wed, Dec 9

2:20 pm - 11:25 amORD Chicago O'Hare Intl-OPO Porto

15h 05m1 stop Zurich

8:05 pm - 12:35 pmOPO Porto-ORD Chicago O'Hare Intl

22h 30m2 stops Geneva Geneve-Cointrin Zurich

$1,007SWISS

Mon, Aug 31 - Mon, Sep 7

2:20 pm - 11:25 amORD Chicago O'Hare Intl-OPO Porto

15h 05m1 stop Zurich

12:50 pm - 12:35 pmOPO Porto-ORD Chicago O'Hare Intl

29h 45m1 stop Zurich

$1,031SWISS

Mon, Aug 31 - Mon, Sep 7

6:00 pm - 3:15 pmORD Chicago O'Hare Intl-OPO Porto

15h 15m1 stop Lisbon Humberto Delgado

8:30 am - 7:45 amOPO Porto-ORD Chicago O'Hare Intl

29h 15m2 stops Lisbon Humberto Delgado Newark

$1,038TAP AIR PORTUGAL

Sun, Aug 30 - Wed, Dec 9

7:25 pm - 10:25 pmORD Chicago O'Hare Intl-OPO Porto

21h 00m2 stops Reykjavik Keflavik Intl Geneva Geneve-Cointrin

8:10 pm - 8:12 pmOPO Porto-ORD Chicago O'Hare Intl

30h 02m2 stops Madrid Barajas Montreal Pierre Elliott Trudeau Intl

$1,100Multiple Airlines

Mon, Aug 31 - Mon, Sep 7

1:30 pm - 6:55 amORD Chicago O'Hare Intl-OPO Porto

11h 25m1 stop Newark

6:00 am - 2:55 pmOPO Porto-ORD Chicago O'Hare Intl

14h 55m1 stop Frankfurt am Main

$1,271United Airlines

Thu, Sep 3 - Wed, Sep 16

1:30 pm - 6:55 amORD Chicago O'Hare Intl-OPO Porto

11h 25m1 stop Newark

6:00 am - 2:55 pmOPO Porto-ORD Chicago O'Hare Intl

14h 55m1 stop Frankfurt am Main

$1,272United Airlines

Thu, Sep 3 - Wed, Sep 16

4:15 pm - 10:40 amORD Chicago O'Hare Intl-OPO Porto

12h 25m1 stop Amsterdam Schiphol

5:00 am - 2:30 pmOPO Porto-ORD Chicago O'Hare Intl

15h 30m1 stop Amsterdam Schiphol

$1,277KLM

Thu, Sep 3 - Wed, Sep 16

6:42 pm - 3:30 pmMDW Chicago Midway-OPO Porto

14h 48m2 stops Detroit Metropolitan Wayne County Amsterdam Schiphol

12:40 pm - 10:44 pmOPO Porto-MDW Chicago Midway

16h 04m2 stops New York John F Kennedy Intl Atlanta Hartsfield-Jackson

$1,701KLM

Thu, Sep 3 - Wed, Sep 16

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Scandinavian Airlines flights from Chicago to Porto

Our best Scandinavian Airlines deals on Chicago to Porto flight tickets

Scandinavian Airlines

Oct 24

ORD7:15 pmChicago O'Hare Intl

16h 30m

1 stop

OPO5:45 pmPorto

Nov 1

OPO5:35 pmPorto

29h 10m

1 stop

ORD4:45 pmChicago O'Hare Intl

$673

Scandinavian Airlines

Nov 2

ORD7:15 pmChicago O'Hare Intl

33h 50m

1 stop

OPO11:05 amPorto

Nov 8

OPO5:35 pmPorto

29h 10m

1 stop

ORD4:45 pmChicago O'Hare Intl

$679

Scandinavian Airlines

Nov 30

ORD7:15 pmChicago O'Hare Intl

33h 50m

1 stop

OPO11:05 amPorto

Dec 6

OPO5:35 pmPorto

29h 10m

1 stop

ORD4:45 pmChicago O'Hare Intl

$706

United Airlines flights from Chicago to Porto

Our best United Airlines deals on Chicago to Porto flight tickets

United Airlines

Dec 2

ORD10:59 amChicago O'Hare Intl

16h 31m

1 stop

OPO9:30 amPorto

Dec 11

OPO6:00 amPorto

20h 05m

1 stop

ORD8:05 pmChicago O'Hare Intl

$717

United Airlines

Dec 1

ORD7:00 amChicago O'Hare Intl

20h 30m

2 stops

OPO9:30 amPorto

Dec 11

OPO12:35 pmPorto

13h 30m

1 stop

ORD8:05 pmChicago O'Hare Intl

$721

United Airlines

Nov 30

ORD5:30 pmChicago O'Hare Intl

10h 00m

1 stop

OPO9:30 amPorto

Dec 11

OPO6:00 amPorto

21h 00m

2 stops

ORD9:00 pmChicago O'Hare Intl

$727

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Thu 10/22

6:00 pm-6:55 pm

1 stop18h 55m

Porto

Thu 10/29

6:00 pm-4:30 pm

1 stop27h 30m

$632

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Wed 10/14

6:00 pm-12:40 am

1 stop24h 40m

Porto

Wed 10/21

11:00 am-12:40 pm

1 stop31h 40m

$633

Quickest round-trip

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Wed 12/2

7:00 pm-3:00 pm

1 stop14h 00m

Porto

Wed 12/9

8:30 am-3:30 pm

1 stop13h 00m

$659

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Sun 9/20

6:00 pm-3:00 pm

1 stop15h 00m

Porto

Fri 10/2

9:00 am-4:00 pm

1 stop13h 00m

$659

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Tue 12/1

11:45 am-9:30 am

1 stop15h 45m

Porto

Fri 12/11

6:00 am-3:20 pm

1 stop15h 20m

$717

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Sun 11/29

7:00 am-9:30 am

1 stop20h 30m

Porto

Fri 12/11

6:00 am-8:05 pm

1 stop20h 05m

$717

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Tue 10/13

8:10 pm-3:40 pm

1 stop37h 30m

Porto

Tue 10/20

10:40 am-9:40 am

1 stop29h 00m

$747

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Tue 10/6

11:25 am-3:40 pm

1 stop22h 15m

Porto

Thu 10/22

11:00 am-9:40 am

1 stop28h 40m

$753

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Thu 11/19

12:49 pm-11:45 am

2 stops16h 56m

Porto

Wed 11/25

8:20 am-2:55 pm

1 stop12h 35m

$759

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Tue 2/2

3:33 pm-11:45 am

2 stops14h 12m

Porto

Mon 2/8

8:40 pm-4:49 pm

2 stops26h 09m

$764

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

Layovers

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 $805 to $1,023.
The lowest price recently found on this route was $632.

What is the cheapest month to fly to Porto?

The month of January is, on average, the cheapest month to fly to Porto from Chicago, with most prices found around $564. If you aren’t able to travel during the month of January, then book flights to Porto from Chicago during April instead. Flights to Porto in April, while not as cheap as those in January, still average around $610.

How far in advance should I book a flight from Chicago 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 $818 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 $647 on momondo.

Can stopping save me money on Chicago to Porto flights?

You could potentially save up to 10% 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

Best Price Found	$304
Fastest flight time	14h 30m
Direct flights	None

The best one-way flight to Porto from Chicago in the past 72 hours is $304. The best round-trip flight deal from Chicago to Porto found on momondo in the last 72 hours is $632.

The fastest flight from Chicago to Porto takes 14h 30m

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

Search flight deals

Frequently asked questions about flying from Chicago to Porto

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 14h 30m.
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 August 2026, there are 7 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 TAP AIR PORTUGAL, making up 68% of the total bookings. Other popular airlines include United Airlines with 23% and Iberia 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 $451	Free Cancellation	Rating 7.2 2,377 reviews	Search TAP AIR PORTUGAL flights
Lufthansa	PriceFrom $474	Free Cancellation	Rating 6.8 8,227 reviews	Search Lufthansa flights
United Airlines	PriceFrom $489	Free Cancellation	Rating 7.4 10,135 reviews	Search United Airlines flights
Iberia	PriceFrom $519	Free Cancellation	Rating 7.0 3,251 reviews	Search Iberia flights
American Airlines	PriceFrom $524	Free Cancellation	Rating 7.1 12,027 reviews	Search American Airlines flights
KLM	PriceFrom $531	Free Cancellation	Rating 7.8 1,567 reviews	Search KLM flights
Turkish Airlines	PriceFrom $618	Free Cancellation	Rating 7.4 4,480 reviews	Search Turkish Airlines flights

Vila Nova de Gaia

Coimbra

Aveiro

Braga

Pinhao

Matosinhos

Esposende

Chaves

Arcos de Valdevez

Viseu

Espinho

Guimarães

Lamego

Ponte de Lima

Mesao Frio

Penafiel

Caminha

Baiao

Mira

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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Airports servicing Portugal

Faro Airport

Lisbon Humberto Delgado Airport

Azores Airport

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Algarve Airport

Cheap flights from Chicago to Porto from $304

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 10/20. 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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Scandinavian Airlines flights from Chicago to Porto

Our best Scandinavian Airlines deals on Chicago to Porto flight tickets

United Airlines flights from Chicago to Porto

Our best United Airlines deals on Chicago to Porto flight tickets

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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 from Chicago 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?

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

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying 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?

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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Popular flights according to clicks in the last 7 days on momondo

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