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Cheap flights from Chicago to Porto from $315

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 10/26. 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.
TAP AIR PORTUGAL Logo
6:00 pm - 3:00 pmORD  Chicago O'Hare Intl-OPO Porto
15h 00m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
10:30 pm - 4:00 pmOPO  Porto-ORD Chicago O'Hare Intl
23h 30m1 stop Lisbon Humberto Delgado
$639TAP AIR PORTUGAL
Sun, Sep 20 - Tue, Oct 6
TAP AIR PORTUGAL Logo
6:00 pm - 3:00 pmORD  Chicago O'Hare Intl-OPO Porto
15h 00m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
10:30 pm - 4:00 pmOPO  Porto-ORD Chicago O'Hare Intl
23h 30m1 stop Lisbon Humberto Delgado
$642TAP AIR PORTUGAL
Sun, Sep 20 - Tue, Oct 6
Multiple Airlines Logo
4:20 pm - 11:45 amORD  Chicago O'Hare Intl-OPO Porto
13h 25m1 stop Frankfurt am Main
Multiple Airlines Logo
8:40 am - 4:15 pmOPO  Porto-ORD Chicago O'Hare Intl
13h 35m1 stop Zurich
$723Multiple Airlines
Tue, Feb 2 - Sat, Feb 13
Scandinavian Airlines Logo
7:15 pm - 11:10 amORD  Chicago O'Hare Intl-OPO Porto
33h 55m1 stop Kastrup Copenhagen
Scandinavian Airlines Logo
5:35 pm - 4:45 pmOPO  Porto-ORD Chicago O'Hare Intl
29h 10m1 stop Kastrup Copenhagen
$736Scandinavian Airlines
Thu, Nov 5 - Sun, Nov 15
Turkish Airlines Logo
11:25 am - 3:40 pmORD  Chicago O'Hare Intl-OPO Porto
22h 15m1 stop Istanbul
Turkish Airlines Logo
4:40 pm - 9:40 amOPO  Porto-ORD Chicago O'Hare Intl
23h 00m1 stop Istanbul
$753Turkish Airlines
Tue, Oct 6 - Thu, Oct 22
Turkish Airlines Logo
8:10 pm - 3:40 pmORD  Chicago O'Hare Intl-OPO Porto
37h 30m1 stop Istanbul
Turkish Airlines Logo
10:40 am - 9:40 amOPO  Porto-ORD Chicago O'Hare Intl
29h 00m1 stop Istanbul
$753Turkish Airlines
Tue, Oct 13 - Tue, Oct 20
Lufthansa Logo
4:20 pm - 11:45 amORD  Chicago O'Hare Intl-OPO Porto
13h 25m1 stop Frankfurt am Main
Lufthansa Logo
1:45 pm - 6:25 pmOPO  Porto-ORD Chicago O'Hare Intl
34h 40m1 stop Munich Franz Josef Strauss
$761Lufthansa
Tue, Nov 24 - Sun, Nov 29
Iberia Logo
5:40 pm - 11:45 amORD  Chicago O'Hare Intl-OPO Porto
12h 05m1 stop Madrid Barajas
Iberia Logo
8:40 pm - 1:45 pmOPO  Porto-ORD Chicago O'Hare Intl
23h 05m2 stops Madrid Barajas London Heathrow
$814Iberia
Sun, Jan 24 - Sat, Jan 30
Iberia Logo
4:45 pm - 7:40 amORD  Chicago O'Hare Intl-OPO Porto
32h 55m2 stops Charlotte Douglas Madrid Barajas
Iberia Logo
8:20 am - 10:28 pmOPO  Porto-ORD Chicago O'Hare Intl
20h 08m2 stops Madrid Barajas New York John F Kennedy Intl
$829Iberia
Sat, Nov 21 - Thu, Nov 26
Lufthansa Logo
4:05 pm - 3:40 pmORD  Chicago O'Hare Intl-OPO Porto
17h 35m1 stop Frankfurt am Main
Lufthansa Logo
6:00 am - 2:10 pmOPO  Porto-ORD Chicago O'Hare Intl
13h 10m1 stop Frankfurt am Main
$836Lufthansa
Wed, Sep 30 - Sun, Nov 1

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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
15h 00m
1 stop
OPO3:00 pmPorto
Oct 6
OPO10:30 pmPorto
23h 30m
1 stop
ORD4:00 pmChicago O'Hare Intl
$639
TAP AIR PORTUGAL
Sep 20
ORD6:00 pmChicago O'Hare Intl
15h 00m
1 stop
OPO3:00 pmPorto
Oct 6
OPO10:30 pmPorto
23h 30m
1 stop
ORD4:00 pmChicago O'Hare Intl
$642
TAP AIR PORTUGAL
Sep 20
ORD6:00 pmChicago O'Hare Intl
15h 00m
1 stop
OPO3:00 pmPorto
Oct 6
OPO10:30 pmPorto
23h 30m
1 stop
ORD4:00 pmChicago O'Hare Intl
$645

KLM flights from Chicago to Porto

Our best KLM deals on Chicago to Porto flight tickets
KLM
Dec 14
MDW1:22 pmChicago Midway
15h 08m
2 stops
OPO10:30 amPorto
Dec 24
OPO5:00 amPorto
17h 22m
2 stops
MDW4:22 pmChicago Midway
$874
KLM
Sep 17
MDW7:01 pmChicago Midway
14h 29m
2 stops
OPO3:30 pmPorto
Oct 9
OPO5:55 amPorto
16h 24m
2 stops
MDW4:19 pmChicago Midway
$1,303
KLM
Sep 24
MDW7:01 pmChicago Midway
14h 29m
2 stops
OPO3:30 pmPorto
Oct 1
OPO5:55 amPorto
16h 20m
2 stops
MDW4:15 pmChicago Midway
$1,371

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 11, 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 Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Sun 9/20

6:00 pm-3:00 pm

1 stop15h 00m

Porto

Tue 10/6

10:30 pm-4:00 pm

1 stop23h 30m

$639

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Sun 9/20

6:00 pm-3:00 pm

1 stop15h 00m

Porto

Tue 10/6

10:30 pm-4:00 pm

1 stop23h 30m

$642
Quickest round-trip

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Tue 2/2

4:20 pm-11:45 am

1 stop13h 25m

Porto

Sat 2/13

8:40 am-4:15 pm

1 stop13h 35m

$723

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Thu 11/5

7:15 pm-11:10 am

1 stop33h 55m

Porto

Sun 11/15

5:35 pm-4:45 pm

1 stop29h 10m

$736

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Tue 10/6

11:25 am-3:40 pm

1 stop22h 15m

Porto

Thu 10/22

4:40 pm-9:40 am

1 stop23h 00m

$753

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Tue 10/13

8:10 pm-3:40 pm

1 stop37h 30m

Porto

Tue 10/20

10:40 am-9:40 am

1 stop29h 00m

$753

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Tue 11/24

4:20 pm-11:45 am

1 stop13h 25m

Porto

Sun 11/29

1:45 pm-6:25 pm

1 stop34h 40m

$761

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Sun 1/24

5:40 pm-11:45 am

1 stop12h 05m

Porto

Sat 1/30

8:40 pm-1:45 pm

2 stops23h 05m

$814

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Sat 11/21

4:45 pm-7:40 am

2 stops32h 55m

Porto

Thu 11/26

8:20 am-10:28 pm

2 stops20h 08m

$829

ChicagoPorto

ORD Chicago O'Hare Intl - OPO Porto

ORDOPO

Chicago O'Hare Intl

Wed 9/30

4:05 pm-3:40 pm

1 stop17h 35m

Porto

Sun 11/1

6:00 am-2:10 pm

1 stop13h 10m

$836

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?

Prices are currently low for flights on this route.

Typical prices usually range from $723 to $1,351.
The lowest price recently found on this route was $639.

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 $577. 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 $610.

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 $818 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 $568 on momondo.

Can stopping save me money on Chicago to Porto flights?

You could potentially save up to 47% 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
2,363 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $474Free CancellationRating
6.8
8,177 reviews
Search Lufthansa flights
United AirlinesPriceFrom $489Free CancellationRating
7.4
10,101 reviews
Search United Airlines flights
IberiaPriceFrom $519Free CancellationRating
7.0
3,263 reviews
Search Iberia flights
American AirlinesPriceFrom $524Free CancellationRating
7.1
11,901 reviews
Search American Airlines flights
KLMPriceFrom $531Free CancellationRating
7.8
1,556 reviews
Search KLM flights
Turkish AirlinesPriceFrom $618Free CancellationRating
7.4
4,480 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
Pinhao
Esposende
Chaves
Arcos de Valdevez
Viseu
Guimarães
Espinho
Lamego
Ponte de Lima
Mesao Frio
Penafiel
Caminha
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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