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Cheap flights from Chicago to Porto from $235

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 11/14. 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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Find the cheapest flights from Chicago to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
TAP AIR PORTUGAL Logo
7:10 pm - 3:05 pmORD-OPO
13h 55m1 stop
TAP AIR PORTUGAL Logo
8:55 am - 3:00 pmOPO-ORD
12h 05m1 stop
$427TAP AIR PORTUGAL
Find Deal
Wed, Nov 12 - Wed, Nov 19
TAP AIR PORTUGAL Logo
7:10 pm - 1:05 pmORD-OPO
11h 55m1 stop
TAP AIR PORTUGAL Logo
8:55 am - 2:45 pmOPO-ORD
11h 50m1 stop
$428TAP AIR PORTUGAL
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Wed, Nov 12 - Sun, Nov 16
Lufthansa Logo
4:20 pm - 11:40 amORD-OPO
13h 20m1 stop
Lufthansa Logo
12:30 pm - 8:05 pmOPO-ORD
13h 35m1 stop
$444Lufthansa
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Tue, Dec 2 - Fri, Dec 12
Lufthansa Logo
9:50 pm - 11:40 pmORD-OPO
19h 50m1 stop
Lufthansa Logo
6:00 am - 1:10 pmOPO-ORD
13h 10m1 stop
$473Lufthansa
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Wed, Dec 31 - Thu, Jan 15
Air Canada Logo
12:50 pm - 12:05 pmORD-OPO
17h 15m2 stops
Air Canada Logo
6:00 am - 8:05 amOPO-ORD
32h 05m2 stops
$484Air Canada
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Tue, Nov 25 - Tue, Dec 2
Air Canada Logo
12:50 pm - 12:05 pmORD-OPO
17h 15m2 stops
Air Canada Logo
6:15 am - 10:05 pmOPO-ORD
21h 50m2 stops
$486Air Canada
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Tue, Dec 2 - Fri, Dec 12
United Airlines Logo
12:45 pm - 9:30 amORD-OPO
14h 45m2 stops
United Airlines Logo
6:00 am - 6:55 pmOPO-ORD
18h 55m2 stops
$488United Airlines
Find Deal
Tue, Nov 11 - Tue, Nov 18
Delta Logo
10:10 am - 10:30 amORD-OPO
18h 20m2 stops
Delta Logo
6:30 am - 4:37 pmOPO-ORD
40h 07m2 stops
$492Delta
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Tue, Feb 17 - Mon, Feb 23
Delta Logo
10:35 am - 10:30 amMDW-OPO
17h 55m2 stops
Delta Logo
11:15 am - 12:01 pmOPO-MDW
30h 46m2 stops
$492Delta
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Wed, Feb 18 - Tue, Feb 24
United Airlines Logo
2:00 pm - 9:30 amORD-OPO
13h 30m2 stops
United Airlines Logo
6:00 am - 8:05 pmOPO-ORD
20h 05m1 stop
$503United Airlines
Find Deal
Fri, Nov 14 - Fri, Nov 21

United Airlines flights from Chicago to Porto

Our best United Airlines deals on Chicago to Porto flight tickets
United Airlines
Nov 11
ORD12:45 pmChicago O'Hare Intl
14h 45m
2 stops
OPO9:30 amPorto
Nov 18
OPO6:00 amPorto
18h 55m
2 stops
ORD6:55 pmChicago O'Hare Intl
$488
Find similar
United Airlines
Nov 14
ORD2:00 pmChicago O'Hare Intl
13h 30m
2 stops
OPO9:30 amPorto
Nov 21
OPO6:00 amPorto
20h 05m
1 stop
ORD8:05 pmChicago O'Hare Intl
$503
Find similar
United Airlines
Oct 28
ORD5:31 pmChicago O'Hare Intl
10h 59m
1 stop
OPO9:30 amPorto
Nov 4
OPO6:00 amPorto
13h 10m
1 stop
ORD1:10 pmChicago O'Hare Intl
$674
Find similar

SWISS flights from Chicago to Porto

Our best SWISS deals on Chicago to Porto flight tickets
SWISS
Feb 17
ORD6:50 pmChicago O'Hare Intl
34h 25m
1 stop
OPO11:15 amPorto
Feb 24
OPO12:05 pmPorto
34h 15m
1 stop
ORD4:20 pmChicago O'Hare Intl
$441
Find similar
SWISS
Nov 11
ORD6:50 pmChicago O'Hare Intl
34h 25m
1 stop
OPO11:15 amPorto
Nov 18
OPO12:05 pmPorto
34h 15m
1 stop
ORD4:20 pmChicago O'Hare Intl
$463
Find similar
SWISS
Feb 19
ORD6:50 pmChicago O'Hare Intl
17h 40m
1 stop
OPO6:30 pmPorto
Feb 24
OPO12:05 pmPorto
34h 15m
1 stop
ORD4:20 pmChicago O'Hare Intl
$466
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Chicago to Porto that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated October 16, 2025.
Use the filters below to find and compare flights from Chicago to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/12

7:10 pm-3:05 pm

1 stop13h 55m

Porto

Wed 11/19

8:55 am-3:00 pm

1 stop12h 05m

$427

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/12

7:10 pm-1:05 pm

1 stop11h 55m

Porto

Sun 11/16

8:55 am-2:45 pm

1 stop11h 50m

$428

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 12/2

4:20 pm-11:40 am

1 stop13h 20m

Porto

Fri 12/12

12:30 pm-8:05 pm

1 stop13h 35m

$444

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 12/31

9:50 pm-11:40 pm

1 stop19h 50m

Porto

Thu 1/15

6:00 am-1:10 pm

1 stop13h 10m

$473

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 11/25

12:50 pm-12:05 pm

2 stops17h 15m

Porto

Tue 12/2

6:00 am-8:05 am

2 stops32h 05m

$484

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 12/2

12:50 pm-12:05 pm

2 stops17h 15m

Porto

Fri 12/12

6:15 am-10:05 pm

2 stops21h 50m

$486

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 11/11

12:45 pm-9:30 am

2 stops14h 45m

Porto

Tue 11/18

6:00 am-6:55 pm

2 stops18h 55m

$488

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 2/17

10:10 am-10:30 am

2 stops18h 20m

Porto

Mon 2/23

6:30 am-4:37 pm

2 stops40h 07m

$492

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 2/18

10:35 am-10:30 am

2 stops17h 55m

Porto

Tue 2/24

11:15 am-12:01 pm

2 stops30h 46m

$492

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 11/14

2:00 pm-9:30 am

2 stops13h 30m

Porto

Fri 11/21

6:00 am-8:05 pm

1 stop20h 05m

$503

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Porto from

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

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 January is, on average, the cheapest month to fly to Porto from Chicago, with most prices found around $593. 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 $616.

What is the cheapest day to depart on your flight to Porto?

The cheapest day to depart on your flight to Porto is on a Monday when prices can be found for as low as $708. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $808. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

What is the cheapest time of day to depart on your flight to Porto?

In the evening is the cheapest time of day to fly from Chicago to Porto when you can find flight prices for as low as $611. Flying to Porto in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,018 on average. Flights to Porto from Chicago at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 $674 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 $626 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

Direct flights

None
There are no direct flights from Chicago to Porto. There are no popular flight routes from Chicago to Porto.
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  • 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 10m.

  • 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?

  • 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?

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 PORTUGALPriceFrom $466Free CancellationRating
7.1
2,016 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $487Free CancellationRating
7.0
2,994 reviews
Search Iberia flights
British AirwaysPriceFrom $504Free CancellationRating
6.7
7,457 reviews
Search British Airways flights
KLMPriceFrom $531Free CancellationRating
7.7
1,404 reviews
Search KLM flights
United AirlinesPriceFrom $544Free CancellationRating
7.4
8,982 reviews
Search United Airlines flights
LufthansaPriceFrom $552Free CancellationRating
6.8
7,497 reviews
Search Lufthansa flights
American AirlinesPriceFrom $554Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
SWISSPriceFrom $558Free CancellationRating
7.5
1,772 reviews
Search SWISS flights
DeltaPriceFrom $638Free CancellationRating
7.9
7,977 reviews
Search Delta flights
Air CanadaPriceFrom $646Free CancellationRating
7.1
10,307 reviews
Search Air Canada flights

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Coimbra
Aveiro
Braga
Matosinhos
Caminha
Esposende
Lamego
Guimarães
Chaves
Espinho
Viseu
Ponte de Lima
Arcos de Valdevez
Pinhao
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.

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