How does KAYAK find such low prices on flights from Illinois to Porto?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Porto. Visit our flight page for the latest deals!>/a>

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Porto?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto from Illinois is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from Illinois to Porto?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Porto with an airline and back to Illinois with another airline. Visit our flight page for the latest deals!>/a>

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Porto?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Porto from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

$254 Cheap Flights from Illinois to Porto

OPO

KAYAK searches hundreds of travel sites at once for deals on flights to Porto

...and more

Travelers love KAYAK

41.299.237 searches in the past 7 days on KAYAK

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Cheapest round-trip

$426

Overall average: $557

TAP AIR PORTUGAL

Wed 1/14Sun 1/18

ORD - OPO • 1 stop

Cheapest one-way

$254

Typical prices: $421-$513

Multiple Airlines

Mon 3/9

ORD - OPO • 2 stops

Start a new search

KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to Porto!

Flight Deals

Cheap Flights from Illinois to Porto

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Illinois to Porto that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Recent round-trip flight deals from Illinois to Porto

Wed, Jan 14 - Sun, Jan 18

7:10 pm - 5:00 pm

ORD

OPO

15h 50m1 stop

6:55 am - 2:45 pm

OPO

ORD

13h 50m1 stop

$426TAP AIR PORTUGAL

Wed, Jan 14 - Sun, Jan 18

7:10 pm - 7:45 am

ORD

OPO

30h 35m1 stop

8:55 am - 2:45 pm

OPO

ORD

11h 50m1 stop

$445TAP AIR PORTUGAL

Sun, Jan 18 - Fri, Jan 30

8:25 pm - 6:05 pm

ORD

OPO

15h 40m1 stop

9:00 am - 3:25 pm

OPO

ORD

12h 25m1 stop

$450TAP AIR PORTUGAL

Tue, Mar 17 - Tue, Mar 24

5:10 pm - 11:15 am

ORD

OPO

13h 05m1 stop

12:05 pm - 1:10 pm

OPO

ORD

30h 05m2 stops

$454SWISS

Mon, Jan 19 - Mon, Jan 26

5:55 pm - 12:05 pm

ORD

OPO

12h 10m1 stop

1:45 pm - 6:25 pm

OPO

ORD

34h 40m1 stop

$456Multiple Airlines

Mon, Jan 12 - Mon, Jan 26

5:55 pm - 12:05 pm

ORD

OPO

12h 10m1 stop

12:05 pm - 12:45 pm

OPO

ORD

30h 40m1 stop

$461Multiple Airlines

Tue, Mar 17 - Tue, Mar 24

5:10 pm - 11:15 am

ORD

OPO

13h 05m1 stop

7:25 pm - 1:45 pm

OPO

ORD

23h 20m1 stop

$462SWISS

Sun, Mar 22 - Wed, Mar 25

8:20 pm - 4:45 pm

ORD

OPO

15h 25m1 stop

10:25 am - 5:45 pm

OPO

ORD

36h 20m1 stop

$463Scandinavian Airlines

Fri, Jan 23 - Tue, Jan 27

3:50 pm - 11:40 am

STL

OPO

13h 50m1 stop

6:00 am - 10:58 pm

OPO

STL

22h 58m2 stops

$502United Airlines

Fri, Jan 23 - Tue, Jan 27

11:20 am - 11:40 am

STL

OPO

18h 20m2 stops

6:00 am - 12:29 pm

OPO

STL

36h 29m2 stops

$506United Airlines

Useful Info

Low season	February
High season	July
Cheapest flight	$254

Best time to beat the crowds with an average 17% drop in price.

Most popular time to fly with an average 20% increase in price.

Flight from Chicago to Porto

How does KAYAK find such low prices on flights from Illinois to Porto?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Porto.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Porto?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Illinois to Porto?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Porto with an airline and back to Illinois with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Porto?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Porto from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Lamego

Guimarães

Pinhao

Chaves

Esposende

Viseu

Arcos de Valdevez

Espinho

Ponte de Lima

Baiao

Caminha

Santa Maria da Feira

Mira

Penafiel

Amares

Curia

Everything you need to know for your flight to Porto

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Information on the airport you'll fly into in Porto

Porto (OPO)

OPO

$254 Find Cheap Flights from Illinois to Porto

KAYAK searches hundreds of travel sites at once for deals on flights to Porto

Everything you should know

Cheap Flights from Illinois to Porto

Recent round-trip flight deals from Illinois to Porto

Recent one-way flight deals from Illinois to Porto

Recent last minute flight deals from Illinois to Porto

Good to know

FAQs for booking flights from Illinois to Porto

How does KAYAK find such low prices on flights from Illinois to Porto?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Porto.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Porto?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Illinois to Porto?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Porto with an airline and back to Illinois with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Porto?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Porto from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near Porto?

Everything you need to know for your flight to Porto

Information on the airport you'll fly into in Porto

Cabin class types available on flights to Illinois

Complete your trip to Porto with a hotel stay or car rental

Find direct flights for Porto

Flights to other popular destinations

Flights from domestic origins to Porto

Choose which airport to fly into in Porto

Find deals for your return flight