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Cheap flights from Chicago O'Hare Intl Airport to Porto from $309

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 12/12. 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

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
7:00 am - 11:00 amORD-OPO
22h 00m2 stops
Scandinavian Airlines Logo
5:55 pm - 4:10 pmOPO-ORD
28h 15m1 stop
$421Scandinavian Airlines
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Tue, Apr 14 - Sun, Apr 19
TAP AIR PORTUGAL Logo
7:10 pm - 6:00 pmORD-OPO
16h 50m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 3:00 pmOPO-ORD
14h 05m1 stop
$425TAP AIR PORTUGAL
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Wed, Dec 3 - Wed, Dec 10
United Airlines Logo
6:30 pm - 9:30 amORD-OPO
10h 00m1 stop
United Airlines Logo
12:00 pm - 7:55 pmOPO-ORD
13h 55m1 stop
$474United Airlines
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Mon, Mar 23 - Tue, Mar 31
Lufthansa Logo
9:50 pm - 11:40 pmORD-OPO
19h 50m1 stop
Lufthansa Logo
1:45 pm - 6:25 pmOPO-ORD
34h 40m1 stop
$475Lufthansa
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Wed, Feb 11 - Mon, Feb 16
United Airlines Logo
6:30 pm - 9:30 amORD-OPO
10h 00m1 stop
United Airlines Logo
12:00 pm - 5:45 pmOPO-ORD
35h 45m2 stops
$480United Airlines
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Mon, Mar 23 - Tue, Mar 31
KLM Logo
4:25 pm - 10:30 amORD-OPO
12h 05m1 stop
KLM Logo
4:10 pm - 2:20 pmOPO-ORD
28h 10m1 stop
$482KLM
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Wed, Nov 26 - Tue, Dec 2
Air Canada Logo
12:50 pm - 12:05 pmORD-OPO
17h 15m2 stops
Air Canada Logo
6:00 am - 10:02 amOPO-ORD
34h 02m2 stops
$483Air Canada
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Wed, Dec 3 - Wed, Dec 10
Air Canada Logo
12:50 pm - 12:05 pmORD-OPO
17h 15m2 stops
Air Canada Logo
6:00 am - 1:01 pmOPO-ORD
37h 01m2 stops
$484Air Canada
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Sun, Feb 1 - Wed, Feb 11
Lufthansa Logo
4:20 pm - 2:45 pmORD-OPO
16h 25m1 stop
Lufthansa Logo
1:45 pm - 6:25 pmOPO-ORD
34h 40m1 stop
$500Lufthansa
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Tue, Nov 25 - Tue, Dec 2
KLM Logo
1:23 pm - 10:30 amORD-OPO
15h 07m2 stops
KLM Logo
4:10 pm - 2:20 pmOPO-ORD
28h 10m1 stop
$537KLM
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Wed, Dec 3 - Sun, Dec 14

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

Our best Scandinavian Airlines deals on Chicago O'Hare Intl Airport to Porto flight tickets
Scandinavian Airlines
Apr 14
ORD7:00 amChicago O'Hare Intl
22h 00m
2 stops
OPO11:00 amPorto
Apr 19
OPO5:55 pmPorto
28h 15m
1 stop
ORD4:10 pmChicago O'Hare Intl
$421
Find similar
Scandinavian Airlines
Apr 13
ORD7:15 pmChicago O'Hare Intl
33h 45m
1 stop
OPO11:00 amPorto
Apr 19
OPO5:55 pmPorto
28h 15m
1 stop
ORD4:10 pmChicago O'Hare Intl
$502
Find similar

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
Mar 23
ORD6:30 pmChicago O'Hare Intl
10h 00m
1 stop
OPO9:30 amPorto
Mar 31
OPO12:00 pmPorto
13h 55m
1 stop
ORD7:55 pmChicago O'Hare Intl
$474
Find similar
United Airlines
Mar 23
ORD6:30 pmChicago O'Hare Intl
10h 00m
1 stop
OPO9:30 amPorto
Mar 31
OPO12:00 pmPorto
35h 45m
2 stops
ORD5:45 pmChicago O'Hare Intl
$480
Find similar
United Airlines
Nov 26
ORD12:45 pmChicago O'Hare Intl
14h 45m
2 stops
OPO9:30 amPorto
Dec 2
OPO12:30 pmPorto
32h 50m
1 stop
ORD3:20 pmChicago O'Hare Intl
$497
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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 November 6, 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

Tue 4/14

7:00 am-11:00 am

2 stops22h 00m

Porto

Sun 4/19

5:55 pm-4:10 pm

1 stop28h 15m

$421

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 12/3

7:10 pm-6:00 pm

1 stop16h 50m

Porto

Wed 12/10

6:55 am-3:00 pm

1 stop14h 05m

$425

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 3/23

6:30 pm-9:30 am

1 stop10h 00m

Porto

Tue 3/31

12:00 pm-7:55 pm

1 stop13h 55m

$474

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 2/11

9:50 pm-11:40 pm

1 stop19h 50m

Porto

Mon 2/16

1:45 pm-6:25 pm

1 stop34h 40m

$475

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 3/23

6:30 pm-9:30 am

1 stop10h 00m

Porto

Tue 3/31

12:00 pm-5:45 pm

2 stops35h 45m

$480

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/26

4:25 pm-10:30 am

1 stop12h 05m

Porto

Tue 12/2

4:10 pm-2:20 pm

1 stop28h 10m

$482

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 12/3

12:50 pm-12:05 pm

2 stops17h 15m

Porto

Wed 12/10

6:00 am-10:02 am

2 stops34h 02m

$483

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 2/1

12:50 pm-12:05 pm

2 stops17h 15m

Porto

Wed 2/11

6:00 am-1:01 pm

2 stops37h 01m

$484

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 11/25

4:20 pm-2:45 pm

1 stop16h 25m

Porto

Tue 12/2

1:45 pm-6:25 pm

1 stop34h 40m

$500

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 12/3

1:23 pm-10:30 am

2 stops15h 07m

Porto

Sun 12/14

4:10 pm-2:20 pm

1 stop28h 10m

$537

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 $488. 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 $677 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 $622 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 10h 00m.

  • 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 $468Free CancellationRating
7.1
2,047 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $487Free CancellationRating
7.0
3,007 reviews
Search Iberia flights
British AirwaysPriceFrom $504Free CancellationRating
6.7
7,500 reviews
Search British Airways flights
LufthansaPriceFrom $526Free CancellationRating
6.8
7,558 reviews
Search Lufthansa flights
KLMPriceFrom $531Free CancellationRating
7.7
1,405 reviews
Search KLM flights
United AirlinesPriceFrom $545Free CancellationRating
7.4
9,007 reviews
Search United Airlines flights
American AirlinesPriceFrom $554Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
SWISSPriceFrom $558Free CancellationRating
7.5
1,779 reviews
Search SWISS flights
DeltaPriceFrom $638Free CancellationRating
7.9
8,001 reviews
Search Delta flights
Air CanadaPriceFrom $646Free CancellationRating
7.1
10,416 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 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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