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

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 Porto to Illinois. 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 Porto to Illinois?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Porto to 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 Porto to Illinois?

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 from Porto to Illinois with an airline and back 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 Porto to Illinois?

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 from Porto to 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>

Which airlines provide the cheapest flights from Porto to Illinois?

In the past 3 days, the cheapest round-trip tickets from Porto to Illinois were found on Scandinavian Airlines ($662) and Delta ($690).

What is the cheapest time of day to fly to Illinois?

The cheapest time of day to fly to Illinois is generally in the morning , when round-trip flights cost $817 on average. The most expensive time of day to fly to Illinois is generally in the morning, which is peak travel time and where the average cost of a ticket is $817.

How long does a flight from Porto to Illinois take?

The duration of a flight to Illinois depends on your arrival airport. The shortest route to Illinois from Porto is to Chicago , which takes 13h 40m .

$570 CHEAP FLIGHTS from Porto to Illinois

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

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Flights Deals

Best Illinois Flight Deals from Porto

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

One-wayRound-trip

St. Louis2 stops$803

Cheap Flights from Porto to Illinois

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Porto to Illinois 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.

Round-trip

One-way

Recent round-trip flight deals from Porto to Illinois

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Porto to Illinois.

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

5:55 pm - 4:10 pmOPO-ORD

28h 15m1 stop

7:15 pm - 11:00 amORD-OPO

33h 45m1 stop

$662Scandinavian Airlines

Find Deal

Fri, Oct 10 - Mon, Oct 13

6:30 am - 2:10 pmOPO-ORD

13h 40m1 stop

6:27 pm - 3:30 pmORD-OPO

15h 03m2 stops

$690Delta

Find Deal

Thu, Jun 12 - Tue, Jun 24

4:20 pm - 2:10 pmOPO-ORD

27h 50m1 stop

4:20 pm - 7:35 pmORD-OPO

21h 15m1 stop

$696KLM

Find Deal

Thu, May 15 - Wed, May 28

6:40 am - 6:03 pmOPO-ORD

17h 23m2 stops

7:00 pm - 3:35 pmORD-OPO

14h 35m2 stops

$702KLM

Find Deal

Fri, Jun 13 - Mon, Jun 23

9:55 am - 6:15 pmOPO-ORD

14h 20m1 stop

11:45 am - 7:35 amORD-OPO

13h 50m2 stops

$717

Find Deal

Thu, May 15 - Wed, May 28

6:05 pm - 3:55 pmOPO-ORD

27h 50m3 stops

10:40 am - 10:00 amORD-OPO

17h 20m2 stops

$734

Find Deal

Thu, May 15 - Wed, May 28

6:00 am - 12:55 pmOPO-ORD

12h 55m1 stop

1:26 pm - 6:55 amORD-OPO

11h 29m1 stop

$736United Airlines

Find Deal

Fri, Jun 13 - Mon, Jun 23

6:00 am - 12:55 pmOPO-ORD

12h 55m1 stop

1:26 pm - 6:55 amORD-OPO

11h 29m1 stop

$737United Airlines

Find Deal

Fri, Jun 13 - Mon, Jun 23

7:20 pm - 3:55 pmOPO-ORD

26h 35m1 stop

2:20 pm - 11:30 amORD-OPO

15h 10m1 stop

$767SWISS

Find Deal

Thu, May 29 - Tue, Jun 3

8:40 am - 3:55 pmOPO-ORD

13h 15m1 stop

2:20 pm - 11:30 amORD-OPO

15h 10m1 stop

$777SWISS

Find Deal

Wed, May 28 - Tue, Jun 3

Useful Info

KAYAK's insights & trends for Porto to Illinois flights

Get data-powered insights and trends into flights from Porto to Illinois to help you find the cheapest flights, the best time to fly and much more.

Prices

Airlines

The cheapest month for flights from Porto to Illinois is March, when tickets cost $635 (return) on average. On the other hand, the most expensive months are July and August, when the average cost of round-trip tickets is $1,082 and $961 respectively.

What’s the cheapest day of the week to fly from Porto to Illinois?

For Porto to Illinois, Saturday is the cheapest day to fly on average and Friday is the most expensive. Flying from Illinois back to Porto, the best deals are generally found on Friday, with Thursday being the most expensive.

Find deals

Low season	March
High season	October
Cheapest flight	$570

Best time to beat the crowds with an average 21% drop in price.

Most popular time to fly and prices are also 9% lower on average.

Flight from Porto to Chicago

How does KAYAK find such low prices on flights from Porto to Illinois?
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 Porto to Illinois.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Porto to Illinois?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Porto to 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 Porto to Illinois?
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 from Porto to Illinois with an airline and back with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Porto to Illinois?
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 from Porto to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.
What is the cheapest time of day to fly to Illinois?
The cheapest time of day to fly to Illinois is generally in the morning, when round-trip flights cost $817 on average. The most expensive time of day to fly to Illinois is generally in the morning, which is peak travel time and where the average cost of a ticket is $817.

Everything you need to know for your flight from Porto to Illinois

Airports

Cabin class

Complete your trip

Flights to other cities

Origins

Popular routes

Return flight deals

Information on your arrival and departure airports

Porto (OPO)

$570 Find Cheap Flights from Porto to Illinois

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

Best Illinois Flight Deals from Porto

Cheap Flights from Porto to Illinois

Recent round-trip flight deals from Porto to Illinois

Recent one-way flight deals from Porto to Illinois

KAYAK's insights & trends for Porto to Illinois flights

Get data-powered insights and trends into flights from Porto to Illinois to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Porto to Illinois?

The cheapest month for flights from Porto to Illinois is March, when tickets cost $635 (return) on average. On the other hand, the most expensive months are July and August, when the average cost of round-trip tickets is $1,082 and $961 respectively.

What’s the cheapest day of the week to fly from Porto to Illinois?

For Porto to Illinois, Saturday is the cheapest day to fly on average and Friday is the most expensive. Flying from Illinois back to Porto, the best deals are generally found on Friday, with Thursday being the most expensive.

Which airlines provide the cheapest flights from Porto to Illinois?

In the past 3 days, the cheapest round-trip tickets from Porto to Illinois were found on Scandinavian Airlines ($662) and Delta ($690).

How long does a flight from Porto to Illinois take?

The duration of a flight to Illinois depends on your arrival airport. The shortest route to Illinois from Porto is to Chicago, which takes 13h 40m.

Good to know

FAQs - booking Illinois flights

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

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 Porto to Illinois.

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

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Porto to 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 Porto to Illinois?

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 from Porto to Illinois with an airline and back with another airline.

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

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 from Porto to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

What is the cheapest time of day to fly to Illinois?

The cheapest time of day to fly to Illinois is generally in the morning, when round-trip flights cost $817 on average. The most expensive time of day to fly to Illinois is generally in the morning, which is peak travel time and where the average cost of a ticket is $817.

Everything you need to know for your flight from Porto to Illinois

Information on your arrival and departure airports

Cabin class types available on flights to Illinois

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

Flights to other popular destinations

Flights from other airports in Porto to Illinois

Flights to popular cities in Illinois

Find deals for your return flight