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>

$347 CHEAP FLIGHTS from Illinois to Porto

OPO

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

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Cheap Flights from Illinois to Porto

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, Sep 2 - Wed, Sep 9

8:10 pm - 3:45 pm

ORD

OPO

37h 35m

1 stop

10:45 am - 9:40 am

OPO

ORD

28h 55m

1 stop

$703Turkish Airlines

Thu, Sep 17 - Fri, Oct 9

8:10 pm - 9:45 am

ORD

OPO

31h 35m

1 stop

10:40 am - 9:40 am

OPO

ORD

29h 00m

1 stop

$705Turkish Airlines

Sun, Oct 25 - Sun, Nov 8

9:10 pm - 5:00 pm

ORD

OPO

14h 50m

1 stop

8:30 am - 3:30 pm

OPO

ORD

13h 00m

1 stop

$719TAP AIR PORTUGAL

Sun, Aug 16 - Tue, Aug 25

6:00 pm - 7:00 pm

ORD

OPO

19h 00m

1 stop

10:30 pm - 2:45 pm

OPO

ORD

22h 15m

1 stop

$760TAP AIR PORTUGAL

Sun, Nov 1 - Fri, Nov 13

6:00 am - 9:05 am

ORD

OPO

21h 05m

1 stop

5:00 am - 2:30 pm

OPO

ORD

15h 30m

1 stop

$762Delta

Sun, Oct 4 - Wed, Oct 21

7:30 am - 9:45 am

STL

OPO

20h 15m

1 stop

12:45 pm - 9:24 pm

OPO

STL

38h 39m

2 stops

$829United Airlines

Sun, Oct 4 - Wed, Oct 21

8:15 pm - 7:00 am

STL

OPO

28h 45m

2 stops

12:45 pm - 9:24 pm

OPO

STL

38h 39m

2 stops

$832United Airlines

Sun, Oct 4 - Wed, Oct 21

4:13 pm - 10:25 am

STL

OPO

12h 12m

1 stop

5:00 am - 5:06 pm

OPO

STL

18h 06m

2 stops

$841Delta

Sun, May 31 - Sun, Jun 7

10:30 am - 11:35 pm

MDW

OPO

31h 05m

3 stops

8:25 am - 9:35 am

OPO

MDW

31h 10m

2 stops

$881Multiple Airlines

Sun, Jun 14 - Sun, Jun 21

3:20 pm - 6:45 am

MDW

OPO

33h 25m

2 stops

8:25 am - 9:40 am

OPO

MDW

31h 15m

2 stops

$917Multiple Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$347

Best time to beat the crowds with an average 24% drop in price.

Most popular time to fly with an average 27% increase in price.

Flight from St. Louis 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

Santa Maria da Feira

Caminha

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

$347 Find Cheap Flights from Illinois to Porto

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

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