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Cheap flights from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport 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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Find the cheapest flights from Chicago O'Hare Intl Airport 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
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
Find Deal
Mon, Oct 27 - Wed, Nov 12
Multiple Airlines Logo
10:50 pm - 11:40 pmORD-OPO
19h 50m1 stop
Multiple Airlines Logo
7:20 pm - 4:20 pmOPO-ORD
27h 00m1 stop
$425Multiple Airlines
Find Deal
Wed, Oct 29 - Wed, Nov 5
Lufthansa Logo
9:50 pm - 11:40 pmORD-OPO
19h 50m1 stop
Lufthansa Logo
12:30 pm - 8:05 pmOPO-ORD
13h 35m1 stop
$467Lufthansa
Find Deal
Wed, Dec 10 - Fri, Dec 19
KLM Logo
5:20 pm - 10:30 amORD-OPO
11h 10m1 stop
KLM Logo
9:55 am - 8:29 pmOPO-ORD
16h 34m2 stops
$475KLM
Find Deal
Sun, Nov 16 - Tue, Nov 25
KLM Logo
1:25 pm - 10:30 amORD-OPO
15h 05m2 stops
KLM Logo
4:10 pm - 2:20 pmOPO-ORD
28h 10m1 stop
$482KLM
Find Deal
Wed, Nov 26 - Tue, Dec 2
TAP AIR PORTUGAL Logo
8:10 pm - 9:55 amORD-OPO
32h 45m1 stop
TAP AIR PORTUGAL Logo
8:55 am - 2:45 pmOPO-ORD
11h 50m1 stop
$483TAP AIR PORTUGAL
Find Deal
Wed, Oct 29 - Sun, Nov 9
TAP AIR PORTUGAL Logo
8:15 pm - 7:00 pmORD-OPO
16h 45m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 3:45 pmOPO-ORD
13h 50m1 stop
$488TAP AIR PORTUGAL
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Fri, Mar 6 - Sun, Mar 15
Iberia Logo
10:11 am - 7:40 amORD-OPO
16h 29m2 stops
Iberia Logo
8:20 am - 2:30 pmOPO-ORD
12h 10m1 stop
$499Iberia
Find Deal
Wed, Oct 29 - Sun, Nov 9
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
Find Deal
Wed, Mar 4 - Sat, Mar 14

United Airlines flights from Chicago O'Hare Intl Airport to Porto

Our best United Airlines deals on Chicago O'Hare Intl Airport 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
17h 08m
2 stops
ORD11:43 pmChicago O'Hare Intl
$436
Find similar

American Airlines flights from Chicago O'Hare Intl Airport to Porto

Our best American Airlines deals on Chicago O'Hare Intl Airport 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
$1,032
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Chicago O'Hare Intl Airport 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 16, 2025.
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport 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

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 10/29

10:50 pm-11:40 pm

1 stop19h 50m

Porto

Wed 11/5

7:20 pm-4:20 pm

1 stop27h 00m

$425

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 12/10

9:50 pm-11:40 pm

1 stop19h 50m

Porto

Fri 12/19

12:30 pm-8:05 pm

1 stop13h 35m

$467

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 11/16

5:20 pm-10:30 am

1 stop11h 10m

Porto

Tue 11/25

9:55 am-8:29 pm

2 stops16h 34m

$475

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/26

1:25 pm-10:30 am

2 stops15h 05m

Porto

Tue 12/2

4:10 pm-2:20 pm

1 stop28h 10m

$482

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 10/29

8:10 pm-9:55 am

1 stop32h 45m

Porto

Sun 11/9

8:55 am-2:45 pm

1 stop11h 50m

$483

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 3/6

8:15 pm-7:00 pm

1 stop16h 45m

Porto

Sun 3/15

6:55 am-3:45 pm

1 stop13h 50m

$488

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 10/29

10:11 am-7:40 am

2 stops16h 29m

Porto

Sun 11/9

8:20 am-2:30 pm

1 stop12h 10m

$499

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

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 O'Hare Intl Airport 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 February is, on average, the cheapest month to fly to Porto from Chicago O'Hare Intl Airport, with most prices found around $492. If you aren’t able to travel during the month of February, then book flights to Porto from Chicago O'Hare Intl Airport during November instead. Flights to Porto in November, while not as cheap as those in February, still average around $581.

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 O'Hare Intl Airport 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 O'Hare Intl Airport 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 O'Hare Intl Airport 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 O'Hare Intl Airport for as low as $626 on momondo.

When to book flights from Chicago O'Hare Intl Airport to Porto

Are you open to changing your travel dates? Check out the ideal times to fly from Chicago O'Hare Intl Airport to Porto according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Chicago O'Hare Intl Airport to Porto (ORD to OPO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago O'Hare Intl Airport to Porto

Direct flights

None
There are no direct flights from Chicago O'Hare Intl Airport to Porto. There are no popular flight routes from Chicago O'Hare Intl Airport to Porto.
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  • How far is Chicago O'Hare Intl to Porto by plane?

    Porto is 3936.9 mi away from Chicago O'Hare Intl. A reasonable flight in good conditions will take 9h 59m.

  • When did momondo last update prices for flights from Chicago O'Hare Intl Airport to Porto Airport?

    Prices for flights from Chicago O'Hare Intl Airport to Porto Airport refresh daily.

  • How many operators does momondo search for flights from Chicago O'Hare Intl Airport to Porto Airport?

  • How old do you have to be to fly from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport to Porto Airport.

  • What documentation or ID do you need to fly to Porto Airport?

    The travel and health documents you'll need for your trip to Porto Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Porto Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Chicago O'Hare Intl Airport to Porto?

Best airlines flying from Chicago O'Hare Intl Airport to Porto

Compare and see reviews for airlines that fly from Chicago O'Hare Intl Airport 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
6.7
7,363 reviews
Search British Airways flights
KLMPriceFrom $525Free CancellationRating
7.8
1,386 reviews
Search KLM flights
LufthansaPriceFrom $553Free CancellationRating
6.8
7,407 reviews
Search Lufthansa flights
United AirlinesPriceFrom $553Free CancellationRating
7.4
8,924 reviews
Search United Airlines flights
American AirlinesPriceFrom $554Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SWISSPriceFrom $558Free CancellationRating
7.6
1,737 reviews
Search SWISS flights
DeltaPriceFrom $639Free CancellationRating
7.9
7,957 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 collates all your flight options in one place and lets you filter them to find the perfect flight from Chicago to Porto. momondo saves you time and could save you money on your trip.

Can I find flights from Chicago to Porto with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Porto from Chicago with this policy.

How can momondo help me find flights from Chicago to Porto?

Once all potential Chicago to Porto flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Chicago to Porto right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Chicago to Porto flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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