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

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

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 54% of people opting to fly with this airline when traveling to Porto. Keep in mind that there are 6 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 connection time from Chicago to Porto?

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

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

Lisbon (LIS) was the most common stop: 66% 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 Lisbon (LIS) offer the lowest average round-trip price of $791.

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.

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 September 2026, there are 6 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.

$277 Cheap Flights from Chicago to Porto in 2026/27

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.

7:15 pm - 4:45 pmORD Chicago O'Hare Intl-OPO Porto

15h 30m1 stop Kastrup Copenhagen

5:45 pm - 4:45 pmOPO Porto-ORD Chicago O'Hare Intl

29h 00m1 stop Kastrup Copenhagen

$470Scandinavian Airlines

Sat, Nov 7 - Fri, Nov 20

7:00 pm - 1:30 pmORD Chicago O'Hare Intl-OPO Porto

12h 30m1 stop Lisbon Humberto Delgado

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

16h 30m1 stop Lisbon Humberto Delgado

$563TAP AIR PORTUGAL

Wed, Nov 11 - Wed, Nov 18

11:05 am - 6:50 amORD Chicago O'Hare Intl-OPO Porto

13h 45m1 stop Montreal Pierre Elliott Trudeau Intl

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

13h 30m1 stop Frankfurt am Main

$566Multiple Airlines

Mon, Oct 19 - Wed, Nov 4

8:10 pm - 6:00 pmORD Chicago O'Hare Intl-OPO Porto

15h 50m1 stop Lisbon Humberto Delgado

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

16h 30m1 stop Lisbon Humberto Delgado

$569TAP AIR PORTUGAL

Sun, Nov 1 - Sun, Nov 8

9:48 pm - 9:30 amORD Chicago O'Hare Intl-OPO Porto

29h 42m1 stop Newark

12:35 pm - 8:14 pmOPO Porto-ORD Chicago O'Hare Intl

13h 39m1 stop Newark

$574United Airlines

Mon, Nov 2 - Fri, Nov 20

5:29 pm - 9:30 amORD Chicago O'Hare Intl-OPO Porto

10h 01m1 stop Newark

12:35 pm - 8:14 pmOPO Porto-ORD Chicago O'Hare Intl

13h 39m1 stop Newark

$574United Airlines

Tue, Nov 3 - Fri, Nov 20

5:40 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

12h 05m1 stop Madrid Barajas

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

12h 35m1 stop Madrid Barajas

$575Iberia

Wed, Nov 11 - Wed, Nov 18

4:55 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

12h 50m1 stop Madrid Barajas

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

12h 35m1 stop Madrid Barajas

$576Iberia

Wed, Oct 14 - Wed, Nov 4

5:40 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

12h 05m1 stop Madrid Barajas

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

12h 35m1 stop Madrid Barajas

$576American Airlines

Tue, Dec 1 - Wed, Dec 9

5:40 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

12h 05m1 stop Madrid Barajas

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

12h 35m1 stop Madrid Barajas

$576American Airlines

Mon, Nov 9 - Wed, Nov 18

Cheap last minute flights

Enter your travel dates to find the best prices.

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

20h 35m1 stop Lisbon Humberto Delgado

7:00 am - 12:40 pmOPO Porto-ORD Chicago O'Hare Intl

11h 40m1 stop Lisbon Humberto Delgado

$613TAP AIR PORTUGAL

Sun, Sep 20 - Thu, Oct 1

3:45 pm - 11:35 amORD Chicago O'Hare Intl-OPO Porto

13h 50m2 stops Toronto Pearson Intl Barcelona-El Prat

7:45 am - 7:48 pmOPO Porto-ORD Chicago O'Hare Intl

18h 03m2 stops Barcelona-El Prat Toronto Pearson Intl

$761Multiple Airlines

Wed, Sep 23 - Tue, Sep 29

3:45 pm - 11:35 amORD Chicago O'Hare Intl-OPO Porto

13h 50m2 stops Toronto Pearson Intl Barcelona-El Prat

10:40 pm - 12:35 pmOPO Porto-ORD Chicago O'Hare Intl

19h 55m2 stops Barcelona-El Prat Zurich

$767Multiple Airlines

Wed, Sep 23 - Mon, Sep 28

4:55 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

12h 50m1 stop Madrid Barajas

8:40 pm - 9:35 pmOPO Porto-ORD Chicago O'Hare Intl

30h 55m2 stops Madrid Barajas Boston Logan Intl

$774Iberia

Wed, Sep 23 - Tue, Sep 29

6:00 pm - 7:00 pmORD Chicago O'Hare Intl-OPO Porto

19h 00m1 stop Lisbon Humberto Delgado

7:00 am - 12:40 pmOPO Porto-ORD Chicago O'Hare Intl

11h 40m1 stop Lisbon Humberto Delgado

$800TAP AIR PORTUGAL

Sun, Sep 20 - Thu, Oct 1

4:55 pm - 8:00 pmORD Chicago O'Hare Intl-OPO Porto

21h 05m1 stop Madrid Barajas

8:40 pm - 9:35 pmOPO Porto-ORD Chicago O'Hare Intl

30h 55m2 stops Madrid Barajas Boston Logan Intl

$852Iberia

Wed, Sep 23 - Mon, Sep 28

3:50 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

13h 55m2 stops Boston Logan Intl Madrid Barajas

8:20 am - 2:25 pmOPO Porto-ORD Chicago O'Hare Intl

12h 05m1 stop Madrid Barajas

$977American Airlines

Wed, Sep 23 - Wed, Oct 7

3:50 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

13h 55m2 stops Boston Logan Intl Madrid Barajas

8:20 am - 2:25 pmOPO Porto-ORD Chicago O'Hare Intl

12h 05m1 stop Madrid Barajas

$1,055American Airlines

Wed, Sep 23 - Wed, Oct 7

9:35 pm - 9:45 amORD Chicago O'Hare Intl-OPO Porto

30h 10m1 stop Newark

12:35 pm - 11:39 pmOPO Porto-ORD Chicago O'Hare Intl

17h 04m1 stop Newark

$1,086United Airlines

Fri, Sep 25 - Sun, Dec 20

10:30 pm - 11:15 amORD Chicago O'Hare Intl-OPO Porto

30h 45m1 stop Frankfurt am Main

12:30 pm - 11:05 amOPO Porto-ORD Chicago O'Hare Intl

28h 35m1 stop Frankfurt am Main

$1,184United Airlines

Thu, Sep 24 - Mon, Dec 21

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Delta flights from Chicago to Porto

Our best Delta deals on Chicago to Porto flight tickets

Delta

Oct 19

ORD1:50 pmChicago O'Hare Intl

14h 40m

1 stop

OPO10:30 amPorto

Nov 4

OPO5:00 amPorto

15h 25m

1 stop

ORD2:25 pmChicago O'Hare Intl

$584

Delta

Oct 18

ORD6:10 amChicago O'Hare Intl

22h 15m

1 stop

OPO10:25 amPorto

Nov 5

OPO10:15 amPorto

29h 12m

1 stop

ORD9:27 amChicago O'Hare Intl

$597

Delta

Oct 18

ORD5:10 pmChicago O'Hare Intl

16h 20m

1 stop

OPO3:30 pmPorto

Nov 4

OPO5:55 amPorto

16h 20m

1 stop

ORD4:15 pmChicago O'Hare Intl

$603

British Airways flights from Chicago to Porto

Our best British Airways deals on Chicago to Porto flight tickets

British Airways

Nov 8

ORD8:30 pmChicago O'Hare Intl

14h 15m

1 stop

OPO4:45 pmPorto

Nov 17

OPO8:20 amPorto

12h 35m

1 stop

ORD2:55 pmChicago O'Hare Intl

$581

British Airways

Oct 19

ORD7:05 pmChicago O'Hare Intl

19h 00m

1 stop

OPO8:05 pmPorto

Nov 4

OPO8:40 pmPorto

26h 15m

2 stops

ORD4:55 pmChicago O'Hare Intl

$583

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Sat 11/7

7:15 pm-4:45 pm

1 stop15h 30m

Porto

Fri 11/20

5:45 pm-4:45 pm

1 stop29h 00m

$470

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Wed 11/11

7:00 pm-1:30 pm

1 stop12h 30m

Porto

Wed 11/18

5:00 am-3:30 pm

1 stop16h 30m

$563

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Mon 10/19

11:05 am-6:50 am

1 stop13h 45m

Porto

Wed 11/4

12:35 pm-8:05 pm

1 stop13h 30m

$566

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Sun 11/1

8:10 pm-6:00 pm

1 stop15h 50m

Porto

Sun 11/8

5:00 am-3:30 pm

1 stop16h 30m

$569

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Mon 11/2

9:48 pm-9:30 am

1 stop29h 42m

Porto

Fri 11/20

12:35 pm-8:14 pm

1 stop13h 39m

$574

Quickest round-trip

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Tue 11/3

5:29 pm-9:30 am

1 stop10h 01m

Porto

Fri 11/20

12:35 pm-8:14 pm

1 stop13h 39m

$574

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Wed 11/11

5:40 pm-11:45 am

1 stop12h 05m

Porto

Wed 11/18

8:20 am-2:55 pm

1 stop12h 35m

$575

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Wed 10/14

4:55 pm-11:45 am

1 stop12h 50m

Porto

Wed 11/4

8:20 am-2:55 pm

1 stop12h 35m

$576

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Tue 12/1

5:40 pm-11:45 am

1 stop12h 05m

Porto

Wed 12/9

8:20 am-2:55 pm

1 stop12h 35m

$576

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Mon 11/9

5:40 pm-11:45 am

1 stop12h 05m

Porto

Wed 11/18

8:20 am-2:55 pm

1 stop12h 35m

$576

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 $790 to $1,065.
The lowest price recently found on this route was $470.

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 $577. 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 $823 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 $674 on momondo.

Can stopping save me money on Chicago to Porto flights?

You could potentially save up to 17% 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	$277
Fastest flight time	13h 55m
Direct flights	None

The best one-way flight to Porto from Chicago in the past 72 hours is $277. The best round-trip flight deal from Chicago to Porto found on momondo in the last 72 hours is $470.

The fastest flight from Chicago to Porto takes 13h 55m

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 13h 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 September 2026, there are 6 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 72% of the total bookings. Other popular airlines include United Airlines with 19% 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 8,237 reviews	Search Lufthansa flights
United Airlines	PriceFrom $489	Free Cancellation	Rating 7.4 10,232 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 7.0 12,087 reviews	Search American Airlines flights
Turkish Airlines	PriceFrom $618	Free Cancellation	Rating 7.4 4,464 reviews	Search Turkish Airlines flights

Coimbra

Vila Nova de Gaia

Aveiro

Braga

Pinhao

Matosinhos

Esposende

Chaves

Viseu

Arcos de Valdevez

Espinho

Guimarães

Lamego

Ponte de Lima

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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Cheap flights from Chicago to Porto from $277

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 10/18. 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

British Airways flights from Chicago to Porto

Our best British Airways 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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