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.

$277 CHEAP FLIGHTS from Illinois 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

Sat, Nov 7 - Fri, Nov 20

7:15 pm - 4:45 pmORD Chicago O'Hare Intl-OPO Porto

15h 30m1 stop Kastrup Copenhagen

5:45 pm - 4:45 pmOPO Porto-ORD Chicago O'Hare Intl

29h 00m1 stop Kastrup Copenhagen

$470Scandinavian Airlines

Wed, Nov 11 - Wed, Nov 18

7:00 pm - 1:30 pmORD Chicago O'Hare Intl-OPO Porto

12h 30m1 stop Lisbon Humberto Delgado

5:00 am - 3:30 pmOPO Porto-ORD Chicago O'Hare Intl

16h 30m1 stop Lisbon Humberto Delgado

$563TAP AIR PORTUGAL

Mon, Oct 19 - Wed, Nov 4

11:05 am - 6:50 amORD Chicago O'Hare Intl-OPO Porto

13h 45m1 stop Montreal Pierre Elliott Trudeau Intl

12:35 pm - 8:05 pmOPO Porto-ORD Chicago O'Hare Intl

13h 30m1 stop Frankfurt am Main

$566Multiple Airlines

Sun, Nov 1 - Sun, Nov 8

8:10 pm - 6:00 pmORD Chicago O'Hare Intl-OPO Porto

15h 50m1 stop Lisbon Humberto Delgado

5:00 am - 3:30 pmOPO Porto-ORD Chicago O'Hare Intl

16h 30m1 stop Lisbon Humberto Delgado

$569TAP AIR PORTUGAL

Mon, Nov 2 - Fri, Nov 20

9:48 pm - 9:30 amORD Chicago O'Hare Intl-OPO Porto

29h 42m1 stop Newark

12:35 pm - 8:14 pmOPO Porto-ORD Chicago O'Hare Intl

13h 39m1 stop Newark

$574United Airlines

Tue, Nov 3 - Fri, Nov 20

5:29 pm - 9:30 amORD Chicago O'Hare Intl-OPO Porto

10h 01m1 stop Newark

12:35 pm - 8:14 pmOPO Porto-ORD Chicago O'Hare Intl

13h 39m1 stop Newark

$574United Airlines

Wed, Nov 11 - Wed, Nov 18

5:40 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

12h 05m1 stop Madrid Barajas

8:20 am - 2:55 pmOPO Porto-ORD Chicago O'Hare Intl

12h 35m1 stop Madrid Barajas

$575Iberia

Wed, Oct 14 - Wed, Nov 4

4:55 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

12h 50m1 stop Madrid Barajas

8:20 am - 2:55 pmOPO Porto-ORD Chicago O'Hare Intl

12h 35m1 stop Madrid Barajas

$576Iberia

Tue, Dec 1 - Wed, Dec 9

5:40 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

12h 05m1 stop Madrid Barajas

8:20 am - 2:55 pmOPO Porto-ORD Chicago O'Hare Intl

12h 35m1 stop Madrid Barajas

$576American Airlines

Mon, Nov 9 - Wed, Nov 18

5:40 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

12h 05m1 stop Madrid Barajas

8:20 am - 2:55 pmOPO Porto-ORD Chicago O'Hare Intl

12h 35m1 stop Madrid Barajas

$576American Airlines

Recent last minute flight deals from Illinois to Porto

Sun, Sep 20 - Thu, Oct 1

6:00 pm - 8:35 pmORD Chicago O'Hare Intl-OPO Porto

20h 35m1 stop Lisbon Humberto Delgado

7:00 am - 12:40 pmOPO Porto-ORD Chicago O'Hare Intl

11h 40m1 stop Lisbon Humberto Delgado

$613TAP AIR PORTUGAL

Wed, Sep 23 - Tue, Sep 29

3:45 pm - 11:35 amORD Chicago O'Hare Intl-OPO Porto

13h 50m2 stops Toronto Pearson Intl Barcelona-El Prat

7:45 am - 7:48 pmOPO Porto-ORD Chicago O'Hare Intl

18h 03m2 stops Barcelona-El Prat Toronto Pearson Intl

$761Multiple Airlines

Wed, Sep 23 - Mon, Sep 28

3:45 pm - 11:35 amORD Chicago O'Hare Intl-OPO Porto

13h 50m2 stops Toronto Pearson Intl Barcelona-El Prat

10:40 pm - 12:35 pmOPO Porto-ORD Chicago O'Hare Intl

19h 55m2 stops Barcelona-El Prat Zurich

$767Multiple Airlines

Wed, Sep 23 - Tue, Sep 29

4:55 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

12h 50m1 stop Madrid Barajas

8:40 pm - 9:35 pmOPO Porto-ORD Chicago O'Hare Intl

30h 55m2 stops Madrid Barajas Boston Logan Intl

$774Iberia

Sun, Sep 20 - Thu, Oct 1

6:00 pm - 7:00 pmORD Chicago O'Hare Intl-OPO Porto

19h 00m1 stop Lisbon Humberto Delgado

7:00 am - 12:40 pmOPO Porto-ORD Chicago O'Hare Intl

11h 40m1 stop Lisbon Humberto Delgado

$800TAP AIR PORTUGAL

Wed, Sep 23 - Mon, Sep 28

4:55 pm - 8:00 pmORD Chicago O'Hare Intl-OPO Porto

21h 05m1 stop Madrid Barajas

8:40 pm - 9:35 pmOPO Porto-ORD Chicago O'Hare Intl

30h 55m2 stops Madrid Barajas Boston Logan Intl

$852Iberia

Wed, Sep 23 - Wed, Oct 7

3:50 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

13h 55m2 stops Boston Logan Intl Madrid Barajas

8:20 am - 2:25 pmOPO Porto-ORD Chicago O'Hare Intl

12h 05m1 stop Madrid Barajas

$977American Airlines

Wed, Sep 23 - Wed, Oct 7

3:50 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

13h 55m2 stops Boston Logan Intl Madrid Barajas

8:20 am - 2:25 pmOPO Porto-ORD Chicago O'Hare Intl

12h 05m1 stop Madrid Barajas

$1,055American Airlines

Fri, Sep 25 - Sun, Dec 20

9:35 pm - 9:45 amORD Chicago O'Hare Intl-OPO Porto

30h 10m1 stop Newark

12:35 pm - 11:39 pmOPO Porto-ORD Chicago O'Hare Intl

17h 04m1 stop Newark

$1,086United Airlines

Thu, Sep 24 - Mon, Dec 21

10:30 pm - 11:15 amORD Chicago O'Hare Intl-OPO Porto

30h 45m1 stop Frankfurt am Main

12:30 pm - 11:05 amOPO Porto-ORD Chicago O'Hare Intl

28h 35m1 stop Frankfurt am Main

$1,184United Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$277

Best time to beat the crowds with an average 25% drop in price.

Most popular time to fly with an average 27% 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.

Guimarães

Lamego

Matosinhos

Viseu

Chaves

Pinhao

Esposende

Santa Maria da Feira

Ponte de Lima

Espinho

Baiao

Arcos de Valdevez

Caminha

Mesao Frio

Mira

Amares

Penafiel

Curia

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OPO

$277 Find Cheap Flights from Illinois to Porto - Compare and Save

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

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High season

Cheapest flight

FAQs for booking flights from Illinois to Porto

Traveling to a place near Porto?

More options for your flight to Porto

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

Information on the airport you'll fly into in Porto

Cabin class types available on flights to Illinois

Find direct flights for Porto

Flights from domestic origins to Porto

Flights to other popular destinations

Find deals for your return flight