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Cheap flights from Chicago to Porto from $274

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 9/4. 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 (CHI-OPO)

Cheap round-trip flights

Scandinavian Airlines Logo
7:20 pm - 4:55 pmORD-OPO
15h 35m1 stop
Scandinavian Airlines Logo
5:45 pm - 4:45 pmOPO-ORD
29h 00m1 stop
$361Scandinavian Airlines
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Thu, Nov 27 - Fri, Dec 12
Scandinavian Airlines Logo
7:20 pm - 4:55 pmORD-OPO
15h 35m1 stop
Scandinavian Airlines Logo
5:45 pm - 4:45 pmOPO-ORD
29h 00m1 stop
$429Scandinavian Airlines
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Thu, Nov 13 - Fri, Nov 21
Air Canada Logo
8:40 am - 11:25 amORD-OPO
20h 45m2 stops
Air Canada Logo
6:00 am - 7:30 pmOPO-ORD
19h 30m2 stops
$474Air Canada
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Mon, Oct 20 - Tue, Nov 4
United Airlines Logo
3:07 pm - 9:30 amORD-OPO
12h 23m1 stop
United Airlines Logo
6:00 am - 1:10 pmOPO-ORD
13h 10m1 stop
$484United Airlines
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Tue, Nov 11 - Tue, Nov 18
United Airlines Logo
2:20 pm - 9:45 amORD-OPO
13h 25m1 stop
United Airlines Logo
6:00 am - 1:10 pmOPO-ORD
13h 10m1 stop
$485United Airlines
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Mon, Oct 20 - Tue, Nov 4
Iberia Logo
4:45 pm - 11:45 amORD-OPO
13h 00m1 stop
Iberia Logo
8:20 am - 2:30 pmOPO-ORD
12h 10m1 stop
$498Iberia
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Tue, Nov 11 - Thu, Feb 5
TAP AIR PORTUGAL Logo
6:00 pm - 5:00 pmORD-OPO
17h 00m1 stop
TAP AIR PORTUGAL Logo
9:15 pm - 4:10 pmOPO-ORD
24h 55m1 stop
$500TAP AIR PORTUGAL
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Sun, Sep 28 - Tue, Oct 14
Iberia Logo
6:45 pm - 8:00 pmORD-OPO
19h 15m2 stops
Iberia Logo
8:20 am - 2:30 pmOPO-ORD
12h 10m1 stop
$502Iberia
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Mon, Nov 10 - Thu, Feb 5
Delta Logo
5:20 pm - 10:30 amORD-OPO
11h 10m1 stop
Delta Logo
11:25 am - 8:20 amOPO-ORD
26h 55m2 stops
$527Delta
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Wed, Nov 12 - Wed, Feb 11
Delta Logo
5:20 pm - 10:30 amORD-OPO
11h 10m1 stop
Delta Logo
6:30 am - 2:20 pmOPO-ORD
13h 50m1 stop
$531Delta
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Sun, Nov 9 - Fri, Feb 6

Air Canada flights from Chicago to Porto

Our best Air Canada deals on Chicago to Porto flight tickets
Air Canada
Oct 20
ORD8:40 amChicago O'Hare Intl
20h 45m
2 stops
OPO11:25 amPorto
Nov 4
OPO6:00 amPorto
19h 30m
2 stops
ORD7:30 pmChicago O'Hare Intl
$474
Find similar
Air Canada
Nov 12
ORD7:15 amChicago O'Hare Intl
22h 50m
2 stops
OPO12:05 pmPorto
Feb 5
OPO6:00 amPorto
43h 30m
2 stops
ORD7:30 pmChicago O'Hare Intl
$514
Find similar
Air Canada
Nov 15
ORD5:55 pmChicago O'Hare Intl
36h 10m
2 stops
OPO12:05 pmPorto
Feb 5
OPO6:00 amPorto
22h 05m
2 stops
ORD10:05 pmChicago O'Hare Intl
$515
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United Airlines flights from Chicago to Porto

Our best United Airlines deals on Chicago to Porto flight tickets
United Airlines
Nov 11
ORD3:07 pmChicago O'Hare Intl
12h 23m
1 stop
OPO9:30 amPorto
Nov 18
OPO6:00 amPorto
13h 10m
1 stop
ORD1:10 pmChicago O'Hare Intl
$484
Find similar
United Airlines
Oct 20
ORD2:20 pmChicago O'Hare Intl
13h 25m
1 stop
OPO9:45 amPorto
Nov 4
OPO6:00 amPorto
13h 10m
1 stop
ORD1:10 pmChicago O'Hare Intl
$485
Find similar
United Airlines
Nov 11
ORD12:45 pmChicago O'Hare Intl
14h 45m
2 stops
OPO9:30 amPorto
Nov 18
OPO6:00 amPorto
13h 10m
1 stop
ORD1:10 pmChicago O'Hare Intl
$489
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 August 25, 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

Thu 11/27

7:20 pm-4:55 pm

1 stop15h 35m

Porto

Fri 12/12

5:45 pm-4:45 pm

1 stop29h 00m

$361

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Thu 11/13

7:20 pm-4:55 pm

1 stop15h 35m

Porto

Fri 11/21

5:45 pm-4:45 pm

1 stop29h 00m

$429

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 10/20

8:40 am-11:25 am

2 stops20h 45m

Porto

Tue 11/4

6:00 am-7:30 pm

2 stops19h 30m

$474

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 11/11

3:07 pm-9:30 am

1 stop12h 23m

Porto

Tue 11/18

6:00 am-1:10 pm

1 stop13h 10m

$484

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 10/20

2:20 pm-9:45 am

1 stop13h 25m

Porto

Tue 11/4

6:00 am-1:10 pm

1 stop13h 10m

$485

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 11/11

4:45 pm-11:45 am

1 stop13h 00m

Porto

Thu 2/5

8:20 am-2:30 pm

1 stop12h 10m

$498

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 9/28

6:00 pm-5:00 pm

1 stop17h 00m

Porto

Tue 10/14

9:15 pm-4:10 pm

1 stop24h 55m

$500

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 11/10

6:45 pm-8:00 pm

2 stops19h 15m

Porto

Thu 2/5

8:20 am-2:30 pm

1 stop12h 10m

$502

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/12

5:20 pm-10:30 am

1 stop11h 10m

Porto

Wed 2/11

11:25 am-8:20 am

2 stops26h 55m

$527

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 11/9

5:20 pm-10:30 am

1 stop11h 10m

Porto

Fri 2/6

6:30 am-2:20 pm

1 stop13h 50m

$531

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 February is, on average, the cheapest month to fly to Porto from Chicago, with most prices found around $580. If you aren’t able to travel during the month of February, then book flights to Porto from Chicago during January instead. Flights to Porto in January, while not as cheap as those in February, still average around $585.

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 $682 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 $464Free CancellationRating
7.1
1,962 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $474Free CancellationRating
7.0
2,889 reviews
Search Iberia flights
British AirwaysPriceFrom $504Free CancellationRating
6.7
7,305 reviews
Search British Airways flights
KLMPriceFrom $549Free CancellationRating
7.8
1,388 reviews
Search KLM flights
American AirlinesPriceFrom $554Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
LufthansaPriceFrom $555Free CancellationRating
6.8
7,359 reviews
Search Lufthansa flights
SWISSPriceFrom $558Free CancellationRating
7.6
1,710 reviews
Search SWISS flights
United AirlinesPriceFrom $560Free CancellationRating
7.4
8,940 reviews
Search United Airlines flights
DeltaPriceFrom $626Free CancellationRating
7.9
7,981 reviews
Search Delta flights
Air CanadaPriceFrom $646Free CancellationRating
7.1
10,000 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
Aveiro
Coimbra
Braga
Matosinhos
Caminha
Guimarães
Lamego
Esposende
Chaves
Arcos de Valdevez
Espinho
Viseu
Ponte de Lima
Pinhao
Santa Maria da Feira
Curia
Penafiel
Mesao Frio
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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