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Cheap flights from Chicago to Porto from $305

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 2/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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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
7:10 pm - 6:00 pm
ORD
-
OPO
16h 50m1 stop
TAP AIR PORTUGAL Logo
8:00 pm - 2:45 pm
OPO
-
ORD
24h 45m1 stop
$428TAP AIR PORTUGAL
Wed, Jan 14 - Sat, Jan 24
TAP AIR PORTUGAL Logo
8:15 pm - 12:30 am
ORD
-
OPO
22h 15m1 stop
TAP AIR PORTUGAL Logo
6:00 pm - 3:25 pm
OPO
-
ORD
27h 25m1 stop
$438TAP AIR PORTUGAL
Fri, Jan 16 - Thu, Jan 29
TAP AIR PORTUGAL Logo
8:25 pm - 3:20 pm
ORD
-
OPO
12h 55m1 stop
TAP AIR PORTUGAL Logo
8:00 pm - 2:45 pm
OPO
-
ORD
24h 45m1 stop
$440TAP AIR PORTUGAL
Sun, Feb 8 - Sat, Feb 14
Multiple Airlines Logo
5:55 pm - 12:05 pm
ORD
-
OPO
12h 10m1 stop
Multiple Airlines Logo
12:05 pm - 4:20 pm
OPO
-
ORD
34h 15m1 stop
$458Multiple Airlines
Wed, Feb 11 - Mon, Feb 16
Lufthansa Logo
6:00 pm - 12:50 pm
ORD
-
OPO
12h 50m1 stop
Lufthansa Logo
6:00 am - 3:20 pm
OPO
-
ORD
15h 20m1 stop
$475Lufthansa
Tue, Jan 13 - Tue, Jan 27
KLM Logo
5:20 pm - 10:30 am
ORD
-
OPO
11h 10m1 stop
KLM Logo
5:00 am - 2:20 pm
OPO
-
ORD
15h 20m1 stop
$478KLM
Mon, Jan 26 - Fri, Feb 6
Multiple Airlines Logo
3:35 pm - 1:15 pm
ORD
-
OPO
15h 40m2 stops
Multiple Airlines Logo
6:00 am - 1:25 pm
OPO
-
ORD
13h 25m1 stop
$482Multiple Airlines
Wed, Feb 4 - Wed, Feb 11
KLM Logo
1:29 pm - 10:30 am
MDW
-
OPO
15h 01m2 stops
KLM Logo
5:00 am - 5:29 pm
OPO
-
MDW
18h 29m2 stops
$492KLM
Wed, Jan 21 - Wed, Jan 28
Delta Logo
1:49 pm - 3:25 pm
MDW
-
OPO
19h 36m2 stops
Delta Logo
5:00 am - 5:55 pm
OPO
-
MDW
18h 55m2 stops
$548Delta
Fri, Jan 23 - Fri, Jan 30
Delta Logo
12:47 pm - 10:30 am
MDW
-
OPO
16h 43m2 stops
Delta Logo
5:00 am - 6:40 pm
OPO
-
MDW
19h 40m2 stops
$572Delta
Wed, Mar 25 - Thu, Apr 2

TAP AIR PORTUGAL flights from Chicago to Porto

Our best TAP AIR PORTUGAL deals on Chicago to Porto flight tickets
TAP AIR PORTUGAL
Jan 14
ORD7:10 pmChicago O'Hare Intl
16h 50m
1 stop
OPO6:00 pmPorto
Jan 24
OPO8:00 pmPorto
24h 45m
1 stop
ORD2:45 pmChicago O'Hare Intl
$428
Find similar
TAP AIR PORTUGAL
Jan 16
ORD8:15 pmChicago O'Hare Intl
22h 15m
1 stop
OPO12:30 amPorto
Jan 29
OPO6:00 pmPorto
27h 25m
1 stop
ORD3:25 pmChicago O'Hare Intl
$438
Find similar
TAP AIR PORTUGAL
Feb 8
ORD8:25 pmChicago O'Hare Intl
12h 55m
1 stop
OPO3:20 pmPorto
Feb 14
OPO8:00 pmPorto
24h 45m
1 stop
ORD2:45 pmChicago O'Hare Intl
$440
Find similar

KLM flights from Chicago to Porto

Our best KLM deals on Chicago to Porto flight tickets
KLM
Jan 26
ORD5:20 pmChicago O'Hare Intl
11h 10m
1 stop
OPO10:30 amPorto
Feb 6
OPO5:00 amPorto
15h 20m
1 stop
ORD2:20 pmChicago O'Hare Intl
$478
Find similar
KLM
Jan 26
ORD1:58 pmChicago O'Hare Intl
14h 32m
2 stops
OPO10:30 amPorto
Feb 6
OPO5:00 amPorto
17h 55m
2 stops
ORD4:55 pmChicago O'Hare Intl
$492
Find similar
KLM
Mar 16
ORD5:25 pmChicago O'Hare Intl
20h 25m
1 stop
OPO6:50 pmPorto
Mar 23
OPO11:25 amPorto
33h 45m
1 stop
ORD4:10 pmChicago O'Hare Intl
$502
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 December 9, 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

Wed 1/14

7:10 pm-6:00 pm

1 stop16h 50m

Porto

Sat 1/24

8:00 pm-2:45 pm

1 stop24h 45m

$428

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 1/16

8:15 pm-12:30 am

1 stop22h 15m

Porto

Thu 1/29

6:00 pm-3:25 pm

1 stop27h 25m

$438

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 2/8

8:25 pm-3:20 pm

1 stop12h 55m

Porto

Sat 2/14

8:00 pm-2:45 pm

1 stop24h 45m

$440

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 2/11

5:55 pm-12:05 pm

1 stop12h 10m

Porto

Mon 2/16

12:05 pm-4:20 pm

1 stop34h 15m

$458

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 1/13

6:00 pm-12:50 pm

1 stop12h 50m

Porto

Tue 1/27

6:00 am-3:20 pm

1 stop15h 20m

$475

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 1/26

5:20 pm-10:30 am

1 stop11h 10m

Porto

Fri 2/6

5:00 am-2:20 pm

1 stop15h 20m

$478

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 2/4

3:35 pm-1:15 pm

2 stops15h 40m

Porto

Wed 2/11

6:00 am-1:25 pm

1 stop13h 25m

$482

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 1/21

1:29 pm-10:30 am

2 stops15h 01m

Porto

Wed 1/28

5:00 am-5:29 pm

2 stops18h 29m

$492

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Fri 1/23

1:49 pm-3:25 pm

2 stops19h 36m

Porto

Fri 1/30

5:00 am-5:55 pm

2 stops18h 55m

$548

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 3/25

12:47 pm-10:30 am

2 stops16h 43m

Porto

Thu 4/2

5:00 am-6:40 pm

2 stops19h 40m

$572

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 April is, on average, the cheapest month to fly to Porto from Chicago, with most prices found around $616. If you aren’t able to travel during the month of April, then book flights to Porto from Chicago during February instead. Flights to Porto in February, while not as cheap as those in April, still average around $628.

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 $674 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 $613 on momondo.

How have Chicago to Porto flight prices changed over time?

As of December 2025, prices for Chicago to Porto flights are approximately 1% more expensive when compared to flights at the same time last year.

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

10h 35m

Direct flights

None
The fastest flight from Chicago to Porto takes 10h 35m
There are no direct flights from Chicago to Porto. There are no popular flight routes from Chicago to Porto.
Search flight deals

  • 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 10m.

  • 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 $480Free CancellationRating
7.1
2,085 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $488Free CancellationRating
7.0
3,043 reviews
Search Iberia flights
British AirwaysPriceFrom $504Free CancellationRating
6.7
7,571 reviews
Search British Airways flights
LufthansaPriceFrom $526Free CancellationRating
6.8
7,618 reviews
Search Lufthansa flights
KLMPriceFrom $531Free CancellationRating
7.7
1,431 reviews
Search KLM flights
United AirlinesPriceFrom $544Free CancellationRating
7.4
9,088 reviews
Search United Airlines flights
American AirlinesPriceFrom $553Free CancellationRating
7.2
11,043 reviews
Search American Airlines flights
SWISSPriceFrom $558Free CancellationRating
7.5
1,807 reviews
Search SWISS flights
DeltaPriceFrom $638Free CancellationRating
7.9
8,010 reviews
Search Delta flights
Air CanadaPriceFrom $646Free CancellationRating
7.1
10,514 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
Braga
Aveiro
Matosinhos
Guimarães
Esposende
Lamego
Chaves
Viseu
Espinho
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 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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