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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 9/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Chicago to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
8:15 pm - 5:00 pm
ORD
-
OPO
15h 45m
1 stop
Scandinavian Airlines Logo
12:00 pm - 5:45 pm
OPO
-
ORD
34h 45m
1 stop
$601Scandinavian Airlines
Wed, Oct 28 - Sat, Oct 31
Multiple Airlines Logo
7:25 pm - 8:00 am
ORD
-
OPO
30h 35m
3 stops
Multiple Airlines Logo
10:25 pm - 6:15 pm
OPO
-
ORD
25h 50m
2 stops
$623Multiple Airlines
Tue, Sep 15 - Tue, Sep 22
TAP AIR PORTUGAL Logo
6:00 pm - 5:00 pm
ORD
-
OPO
17h 00m
1 stop
TAP AIR PORTUGAL Logo
9:15 pm - 4:00 pm
OPO
-
ORD
24h 45m
1 stop
$631TAP AIR PORTUGAL
Sun, Sep 20 - Tue, Oct 6
TAP AIR PORTUGAL Logo
6:00 pm - 3:00 pm
ORD
-
OPO
15h 00m
1 stop
TAP AIR PORTUGAL Logo
7:00 am - 12:40 pm
OPO
-
ORD
11h 40m
1 stop
$632TAP AIR PORTUGAL
Sun, Sep 20 - Thu, Oct 1
TAP AIR PORTUGAL Logo
6:00 pm - 3:00 pm
ORD
-
OPO
15h 00m
1 stop
TAP AIR PORTUGAL Logo
5:05 am - 4:00 pm
OPO
-
ORD
16h 55m
1 stop
$633TAP AIR PORTUGAL
Wed, Sep 23 - Wed, Oct 7
TAP AIR PORTUGAL Logo
6:00 pm - 3:00 pm
ORD
-
OPO
15h 00m
1 stop
TAP AIR PORTUGAL Logo
5:05 am - 4:00 pm
OPO
-
ORD
16h 55m
1 stop
$634TAP AIR PORTUGAL
Wed, Sep 23 - Wed, Oct 7
Scandinavian Airlines Logo
7:15 pm - 11:05 am
ORD
-
OPO
33h 50m
1 stop
Scandinavian Airlines Logo
11:55 am - 4:45 pm
OPO
-
ORD
34h 50m
1 stop
$644Scandinavian Airlines
Mon, Nov 2 - Wed, Nov 11
Scandinavian Airlines Logo
7:15 pm - 11:00 am
ORD
-
OPO
33h 45m
1 stop
Scandinavian Airlines Logo
5:35 pm - 4:45 pm
OPO
-
ORD
29h 10m
1 stop
$646Scandinavian Airlines
Tue, Oct 20 - Sun, Nov 1
Delta Logo
1:28 pm - 10:35 am
MDW
-
OPO
15h 07m
2 stops
Delta Logo
5:00 am - 10:25 pm
OPO
-
MDW
23h 25m
2 stops
$774Delta
Sun, Nov 1 - Wed, Nov 4
Delta Logo
9:30 am - 10:35 am
MDW
-
OPO
19h 05m
2 stops
Delta Logo
5:00 am - 4:50 pm
OPO
-
MDW
17h 50m
2 stops
$824Delta
Sat, Nov 14 - Fri, Nov 20

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TAP AIR PORTUGAL flights from Chicago to Porto

Our best TAP AIR PORTUGAL deals on Chicago to Porto flight tickets
TAP AIR PORTUGAL
Sep 20
ORD6:00 pmChicago O'Hare Intl
17h 00m
1 stop
OPO5:00 pmPorto
Oct 6
OPO9:15 pmPorto
24h 45m
1 stop
ORD4:00 pmChicago O'Hare Intl
$631
TAP AIR PORTUGAL
Sep 20
ORD6:00 pmChicago O'Hare Intl
15h 00m
1 stop
OPO3:00 pmPorto
Oct 1
OPO7:00 amPorto
11h 40m
1 stop
ORD12:40 pmChicago O'Hare Intl
$632
TAP AIR PORTUGAL
Sep 23
ORD6:00 pmChicago O'Hare Intl
15h 00m
1 stop
OPO3:00 pmPorto
Oct 7
OPO5:05 amPorto
16h 55m
1 stop
ORD4:00 pmChicago O'Hare Intl
$633

Scandinavian Airlines flights from Chicago to Porto

Our best Scandinavian Airlines deals on Chicago to Porto flight tickets
Scandinavian Airlines
Oct 28
ORD8:15 pmChicago O'Hare Intl
15h 45m
1 stop
OPO5:00 pmPorto
Oct 31
OPO12:00 pmPorto
34h 45m
1 stop
ORD5:45 pmChicago O'Hare Intl
$601
Scandinavian Airlines
Nov 2
ORD7:15 pmChicago O'Hare Intl
33h 50m
1 stop
OPO11:05 amPorto
Nov 11
OPO11:55 amPorto
34h 50m
1 stop
ORD4:45 pmChicago O'Hare Intl
$644
Scandinavian Airlines
Oct 20
ORD7:15 pmChicago O'Hare Intl
33h 45m
1 stop
OPO11:00 amPorto
Nov 1
OPO5:35 pmPorto
29h 10m
1 stop
ORD4:45 pmChicago O'Hare Intl
$646

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 July 6, 2026.
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

Cheapest round-trip

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 10/28

8:15 pm-5:00 pm

1 stop15h 45m

Porto

Sat 10/31

12:00 pm-5:45 pm

1 stop34h 45m

$601

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 9/15

7:25 pm-8:00 am

3 stops30h 35m

Porto

Tue 9/22

10:25 pm-6:15 pm

2 stops25h 50m

$623

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 9/20

6:00 pm-5:00 pm

1 stop17h 00m

Porto

Tue 10/6

9:15 pm-4:00 pm

1 stop24h 45m

$631
Quickest round-trip

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 9/20

6:00 pm-3:00 pm

1 stop15h 00m

Porto

Thu 10/1

7:00 am-12:40 pm

1 stop11h 40m

$632

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 9/23

6:00 pm-3:00 pm

1 stop15h 00m

Porto

Wed 10/7

5:05 am-4:00 pm

1 stop16h 55m

$633

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 9/23

6:00 pm-3:00 pm

1 stop15h 00m

Porto

Wed 10/7

5:05 am-4:00 pm

1 stop16h 55m

$634

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 11/2

7:15 pm-11:05 am

1 stop33h 50m

Porto

Wed 11/11

11:55 am-4:45 pm

1 stop34h 50m

$644

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 10/20

7:15 pm-11:00 am

1 stop33h 45m

Porto

Sun 11/1

5:35 pm-4:45 pm

1 stop29h 10m

$646

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Sun 11/1

1:28 pm-10:35 am

2 stops15h 07m

Porto

Wed 11/4

5:00 am-10:25 pm

2 stops23h 25m

$774

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Sat 11/14

9:30 am-10:35 am

2 stops19h 05m

Porto

Fri 11/20

5:00 am-4:50 pm

2 stops17h 50m

$824

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 September is, on average, the cheapest month to fly to Porto from Chicago, with most prices found around $355. If you aren’t able to travel during the month of September, then book flights to Porto from Chicago during May instead. Flights to Porto in May, while not as cheap as those in September, still average around $372.

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 $802 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 $557 on momondo.

Can stopping save me money on Chicago to Porto flights?

You could potentially save up to 9% 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

Fastest flight time

11h 20m

Direct flights

None
The fastest flight from Chicago to Porto takes 11h 20m
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 11h 20m.

  • 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 $451Free CancellationRating
7.2
2,317 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $474Free CancellationRating
6.8
8,119 reviews
Search Lufthansa flights
United AirlinesPriceFrom $489Free CancellationRating
7.4
9,940 reviews
Search United Airlines flights
IberiaPriceFrom $519Free CancellationRating
7.0
3,247 reviews
Search Iberia flights
American AirlinesPriceFrom $524Free CancellationRating
7.1
11,782 reviews
Search American Airlines flights
KLMPriceFrom $531Free CancellationRating
7.8
1,534 reviews
Search KLM flights
Turkish AirlinesPriceFrom $618Free CancellationRating
7.4
4,437 reviews
Search Turkish Airlines 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
Braga
Aveiro
Matosinhos
Esposende
Lamego
Chaves
Pinhao
Arcos de Valdevez
Guimarães
Espinho
Ponte de Lima
Viseu
Curia
Mesao Frio
Penafiel
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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