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Cheap flights from Chicago to Porto from $285

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 1/16. 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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0 bags

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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 - 7:00 pmORD-OPO
17h 50m1 stop
TAP AIR PORTUGAL Logo
5:00 am - 2:45 pmOPO-ORD
15h 45m1 stop
$425TAP AIR PORTUGAL
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Wed, Dec 3 - Sun, Dec 14
TAP AIR PORTUGAL Logo
7:10 pm - 6:00 pmORD-OPO
16h 50m1 stop
TAP AIR PORTUGAL Logo
5:00 am - 2:45 pmOPO-ORD
15h 45m1 stop
$434TAP AIR PORTUGAL
Find Deal
Wed, Dec 3 - Sun, Dec 14
TAP AIR PORTUGAL Logo
7:10 pm - 6:00 pmORD-OPO
16h 50m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 2:45 pmOPO-ORD
13h 50m1 stop
$439TAP AIR PORTUGAL
Find Deal
Wed, Dec 3 - Sun, Dec 7
Lufthansa Logo
9:50 pm - 11:40 pmORD-OPO
19h 50m1 stop
Lufthansa Logo
1:45 pm - 1:10 pmOPO-ORD
29h 25m2 stops
$509Lufthansa
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Wed, Nov 26 - Tue, Dec 2
Lufthansa Logo
9:40 pm - 11:25 pmORD-OPO
19h 45m1 stop
Lufthansa Logo
6:00 am - 12:55 pmOPO-ORD
12h 55m1 stop
$510Lufthansa
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Sun, May 3 - Tue, May 12
United Airlines Logo
2:00 pm - 2:55 pmORD-OPO
18h 55m2 stops
United Airlines Logo
12:30 pm - 3:20 pmOPO-ORD
32h 50m1 stop
$511United Airlines
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Mon, Dec 8 - Mon, Dec 15
United Airlines Logo
11:18 am - 2:55 pmORD-OPO
21h 37m2 stops
United Airlines Logo
12:30 pm - 7:57 pmOPO-ORD
37h 27m2 stops
$521United Airlines
Find Deal
Mon, Dec 8 - Mon, Dec 15
Delta Logo
9:40 am - 10:30 amORD-OPO
18h 50m2 stops
Delta Logo
5:00 am - 2:20 pmOPO-ORD
15h 20m1 stop
$531Delta
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Wed, Dec 3 - Sun, Dec 7
Delta Logo
1:14 pm - 10:30 amMDW-OPO
15h 16m2 stops
Delta Logo
6:30 am - 6:18 pmOPO-MDW
17h 48m2 stops
$547Delta
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Wed, Dec 3 - Mon, Dec 8
Iberia Logo
5:40 pm - 11:45 amORD-OPO
12h 05m1 stop
Iberia Logo
8:20 am - 7:45 pmOPO-ORD
17h 25m2 stops
$554Iberia
Find Deal
Mon, Dec 8 - Mon, Dec 15

United Airlines flights from Chicago to Porto

Our best United Airlines deals on Chicago to Porto flight tickets
United Airlines
Dec 8
ORD2:00 pmChicago O'Hare Intl
18h 55m
2 stops
OPO2:55 pmPorto
Dec 15
OPO12:30 pmPorto
32h 50m
1 stop
ORD3:20 pmChicago O'Hare Intl
$511
Find similar
United Airlines
Dec 8
ORD11:18 amChicago O'Hare Intl
21h 37m
2 stops
OPO2:55 pmPorto
Dec 15
OPO12:30 pmPorto
37h 27m
2 stops
ORD7:57 pmChicago O'Hare Intl
$521
Find similar
United Airlines
Nov 22
ORD5:31 pmChicago O'Hare Intl
9h 59m
1 stop
OPO9:30 amPorto
Nov 28
OPO12:30 pmPorto
28h 40m
1 stop
ORD11:10 amChicago O'Hare Intl
$1,664
Find similar

American Airlines flights from Chicago to Porto

Our best American Airlines deals on Chicago to Porto flight tickets
American Airlines
Dec 4
ORD9:55 amChicago O'Hare Intl
15h 45m
2 stops
OPO7:40 amPorto
Dec 12
OPO8:20 amPorto
12h 35m
1 stop
ORD2:55 pmChicago O'Hare Intl
$549
Find similar
American Airlines
Jan 9
ORD5:40 pmChicago O'Hare Intl
12h 05m
1 stop
OPO11:45 amPorto
Jan 19
OPO4:40 pmPorto
28h 15m
1 stop
ORD2:55 pmChicago O'Hare Intl
$555
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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 November 12, 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 12/3

7:10 pm-7:00 pm

1 stop17h 50m

Porto

Sun 12/14

5:00 am-2:45 pm

1 stop15h 45m

$425

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 12/3

7:10 pm-6:00 pm

1 stop16h 50m

Porto

Sun 12/14

5:00 am-2:45 pm

1 stop15h 45m

$434

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 12/3

7:10 pm-6:00 pm

1 stop16h 50m

Porto

Sun 12/7

6:55 am-2:45 pm

1 stop13h 50m

$439

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/26

9:50 pm-11:40 pm

1 stop19h 50m

Porto

Tue 12/2

1:45 pm-1:10 pm

2 stops29h 25m

$509

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 5/3

9:40 pm-11:25 pm

1 stop19h 45m

Porto

Tue 5/12

6:00 am-12:55 pm

1 stop12h 55m

$510

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 12/8

2:00 pm-2:55 pm

2 stops18h 55m

Porto

Mon 12/15

12:30 pm-3:20 pm

1 stop32h 50m

$511

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 12/8

11:18 am-2:55 pm

2 stops21h 37m

Porto

Mon 12/15

12:30 pm-7:57 pm

2 stops37h 27m

$521

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 12/3

9:40 am-10:30 am

2 stops18h 50m

Porto

Sun 12/7

5:00 am-2:20 pm

1 stop15h 20m

$531

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 12/3

1:14 pm-10:30 am

2 stops15h 16m

Porto

Mon 12/8

6:30 am-6:18 pm

2 stops17h 48m

$547

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 12/8

5:40 pm-11:45 am

1 stop12h 05m

Porto

Mon 12/15

8:20 am-7:45 pm

2 stops17h 25m

$554

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 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 February instead. Flights to Porto in February, while not as cheap as those in April, still average around $628.

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 $676 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 $622 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 $468Free CancellationRating
7.1
2,059 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $487Free CancellationRating
7.0
3,009 reviews
Search Iberia flights
British AirwaysPriceFrom $504Free CancellationRating
6.7
7,513 reviews
Search British Airways flights
LufthansaPriceFrom $526Free CancellationRating
6.8
7,567 reviews
Search Lufthansa flights
KLMPriceFrom $531Free CancellationRating
7.7
1,410 reviews
Search KLM flights
United AirlinesPriceFrom $545Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
American AirlinesPriceFrom $554Free CancellationRating
7.2
11,049 reviews
Search American Airlines flights
SWISSPriceFrom $558Free CancellationRating
7.5
1,784 reviews
Search SWISS flights
DeltaPriceFrom $638Free CancellationRating
7.9
8,011 reviews
Search Delta flights
Air CanadaPriceFrom $646Free CancellationRating
7.1
10,443 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
Matosinhos
Braga
Lamego
Guimarães
Esposende
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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