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Cheap flights from Chicago to Porto from $264

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 9/28. 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

United Airlines Logo
12:45 pm - 9:30 amORD-OPO
15h 45m2 stops
United Airlines Logo
12:35 pm - 8:07 pmOPO-ORD
13h 32m1 stop
$410United Airlines
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Mon, Oct 27 - Wed, Nov 12
Logo
12:50 pm - 12:05 pmORD-OPO
18h 15m2 stops
Logo
12:10 pm - 4:20 pmOPO-ORD
34h 10m1 stop
$413
Find Deal
Mon, Oct 27 - Wed, Nov 12
United Airlines Logo
4:20 pm - 9:30 amORD-OPO
12h 10m1 stop
United Airlines Logo
12:35 pm - 8:07 pmOPO-ORD
13h 32m1 stop
$414United Airlines
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Mon, Oct 27 - Wed, Nov 12
Lufthansa Logo
9:50 pm - 11:40 pmORD-OPO
19h 50m1 stop
Lufthansa Logo
6:15 am - 7:25 pmOPO-ORD
18h 10m1 stop
$467Lufthansa
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Wed, Mar 4 - Fri, Mar 13
Delta Logo
10:22 am - 10:15 amORD-OPO
18h 53m2 stops
Delta Logo
6:00 am - 5:45 pmOPO-ORD
17h 45m2 stops
$479Delta
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Mon, Oct 27 - Wed, Nov 12
Delta Logo
10:47 am - 10:30 amMDW-OPO
17h 43m2 stops
Delta Logo
6:05 am - 6:00 pmOPO-MDW
17h 55m2 stops
$479Delta
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Wed, Nov 26 - Tue, Dec 2
Iberia Logo
11:40 am - 11:45 amORD-OPO
18h 05m2 stops
Iberia Logo
8:20 am - 2:30 pmOPO-ORD
12h 10m1 stop
$499Iberia
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Fri, Jan 30 - Thu, Feb 5
TAP AIR PORTUGAL Logo
8:15 pm - 5:00 pmORD-OPO
14h 45m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 2:45 pmOPO-ORD
13h 50m1 stop
$512TAP AIR PORTUGAL
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Fri, Nov 14 - Sun, Nov 23
Lufthansa Logo
9:50 pm - 11:40 pmORD-OPO
19h 50m1 stop
Lufthansa Logo
6:15 am - 7:25 pmOPO-ORD
18h 10m1 stop
$517Lufthansa
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Wed, Mar 4 - Sat, Mar 14
TAP AIR PORTUGAL Logo
6:15 pm - 5:00 pmORD-OPO
16h 45m1 stop
TAP AIR PORTUGAL Logo
11:55 am - 4:10 pmOPO-ORD
34h 15m1 stop
$525TAP AIR PORTUGAL
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Sat, Oct 11 - Tue, Oct 21

United Airlines flights from Chicago to Porto

Our best United Airlines deals on Chicago to Porto flight tickets
United Airlines
Oct 27
ORD12:45 pmChicago O'Hare Intl
15h 45m
2 stops
OPO9:30 amPorto
Nov 12
OPO12:35 pmPorto
13h 32m
1 stop
ORD8:07 pmChicago O'Hare Intl
$410
Find similar
United Airlines
Oct 27
ORD4:20 pmChicago O'Hare Intl
12h 10m
1 stop
OPO9:30 amPorto
Nov 12
OPO12:35 pmPorto
13h 32m
1 stop
ORD8:07 pmChicago O'Hare Intl
$414
Find similar
United Airlines
Oct 27
ORD12:00 pmChicago O'Hare Intl
16h 30m
1 stop
OPO9:30 amPorto
Nov 12
OPO12:35 pmPorto
14h 41m
1 stop
ORD9:16 pmChicago O'Hare Intl
$436
Find similar

American Airlines flights from Chicago to Porto

Our best American Airlines deals on Chicago to Porto flight tickets
American Airlines
Oct 27
ORD5:45 pmChicago O'Hare Intl
17h 15m
1 stop
OPO4:00 pmPorto
Nov 12
OPO8:20 amPorto
12h 10m
1 stop
ORD2:30 pmChicago O'Hare Intl
$446
Find similar
American Airlines
Sep 27
ORD9:24 amChicago O'Hare Intl
16h 11m
2 stops
OPO7:35 amPorto
Oct 11
OPO8:15 amPorto
17h 17m
2 stops
ORD7:32 pmChicago O'Hare Intl
$1,027
Find similar
American Airlines
Sep 27
ORD9:24 amChicago O'Hare Intl
16h 11m
2 stops
OPO7:35 amPorto
Oct 11
OPO8:15 amPorto
17h 17m
2 stops
ORD7:32 pmChicago O'Hare Intl
$1,032
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 September 15, 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

Mon 10/27

12:45 pm-9:30 am

2 stops15h 45m

Porto

Wed 11/12

12:35 pm-8:07 pm

1 stop13h 32m

$410

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 10/27

12:50 pm-12:05 pm

2 stops18h 15m

Porto

Wed 11/12

12:10 pm-4:20 pm

1 stop34h 10m

$413

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 10/27

4:20 pm-9:30 am

1 stop12h 10m

Porto

Wed 11/12

12:35 pm-8:07 pm

1 stop13h 32m

$414

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 3/4

9:50 pm-11:40 pm

1 stop19h 50m

Porto

Fri 3/13

6:15 am-7:25 pm

1 stop18h 10m

$467

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 10/27

10:22 am-10:15 am

2 stops18h 53m

Porto

Wed 11/12

6:00 am-5:45 pm

2 stops17h 45m

$479

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 11/26

10:47 am-10:30 am

2 stops17h 43m

Porto

Tue 12/2

6:05 am-6:00 pm

2 stops17h 55m

$479

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 1/30

11:40 am-11:45 am

2 stops18h 05m

Porto

Thu 2/5

8:20 am-2:30 pm

1 stop12h 10m

$499

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 11/14

8:15 pm-5:00 pm

1 stop14h 45m

Porto

Sun 11/23

6:55 am-2:45 pm

1 stop13h 50m

$512

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 3/4

9:50 pm-11:40 pm

1 stop19h 50m

Porto

Sat 3/14

6:15 am-7:25 pm

1 stop18h 10m

$517

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sat 10/11

6:15 pm-5:00 pm

1 stop16h 45m

Porto

Tue 10/21

11:55 am-4:10 pm

1 stop34h 15m

$525

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 January is, on average, the cheapest month to fly to Porto from Chicago, with most prices found around $585. 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 $680 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 9h 59m.

  • 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 $453Free CancellationRating
7.1
1,975 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $472Free CancellationRating
7.0
2,924 reviews
Search Iberia flights
British AirwaysPriceFrom $504Free CancellationRating
6.6
7,361 reviews
Search British Airways flights
KLMPriceFrom $525Free CancellationRating
7.8
1,385 reviews
Search KLM flights
LufthansaPriceFrom $553Free CancellationRating
6.8
7,407 reviews
Search Lufthansa flights
United AirlinesPriceFrom $553Free CancellationRating
7.4
8,929 reviews
Search United Airlines flights
American AirlinesPriceFrom $554Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SWISSPriceFrom $558Free CancellationRating
7.5
1,730 reviews
Search SWISS flights
DeltaPriceFrom $639Free CancellationRating
7.9
7,954 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
Esposende
Lamego
Chaves
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
Pinhao
Santa Maria da Feira
Curia
Penafiel
Mesao Frio
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.

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