$401 Find Cheap Flights from Porto to Illinois - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Porto to Illinois departing on 10/29. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Porto to Illinois, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Porto to Illinois, as well as popular online travel agencies
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Flight Deals

Book Cheap Porto to Illinois Plane Tickets

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

Recent round-trip flight deals from Porto to Illinois

Thu, Nov 5 - Mon, Nov 9
Scandinavian Airlines Logo
5:50 pm - 4:45 pm
OPO
-
ORD
28h 55m
1 stop
Scandinavian Airlines Logo
7:15 pm - 11:05 am
ORD
-
OPO
33h 50m
1 stop
$630Scandinavian Airlines
Thu, Nov 5 - Mon, Nov 9
Scandinavian Airlines Logo
5:50 pm - 4:45 pm
OPO
-
ORD
28h 55m
1 stop
Scandinavian Airlines Logo
7:15 pm - 11:05 am
ORD
-
OPO
33h 50m
1 stop
$632Scandinavian Airlines
Tue, Jul 21 - Tue, Jul 28
Multiple Airlines Logo
8:25 am - 8:29 pm
OPO
-
ORD
18h 04m
2 stops
Multiple Airlines Logo
7:25 pm - 8:10 am
ORD
-
OPO
30h 45m
3 stops
$771Multiple Airlines
Tue, Jul 21 - Tue, Jul 28
Multiple Airlines Logo
8:25 am - 1:19 pm
OPO
-
ORD
34h 54m
2 stops
Multiple Airlines Logo
7:25 pm - 9:00 am
ORD
-
OPO
31h 35m
3 stops
$778Multiple Airlines
Tue, Jul 21 - Tue, Jul 28
Multiple Airlines Logo
8:25 am - 1:19 pm
OPO
-
ORD
34h 54m
2 stops
Multiple Airlines Logo
7:25 pm - 6:35 pm
ORD
-
OPO
17h 10m
2 stops
$780Multiple Airlines
Tue, Jul 21 - Tue, Jul 28
Multiple Airlines Logo
8:25 am - 1:19 pm
OPO
-
ORD
34h 54m
2 stops
Multiple Airlines Logo
7:25 pm - 6:35 pm
ORD
-
OPO
17h 10m
2 stops
$789Multiple Airlines
Thu, Nov 5 - Mon, Nov 9
American Airlines Logo
8:20 am - 3:10 pm
OPO
-
ORD
12h 50m
1 stop
American Airlines Logo
4:06 pm - 11:45 am
ORD
-
OPO
13h 39m
2 stops
$796American Airlines
Thu, Nov 5 - Mon, Nov 9
American Airlines Logo
8:20 am - 3:10 pm
OPO
-
ORD
12h 50m
1 stop
American Airlines Logo
4:06 pm - 11:45 am
ORD
-
OPO
13h 39m
2 stops
$798American Airlines
Thu, Sep 10 - Fri, Oct 16
KLM Logo
5:00 am - 7:58 pm
OPO
-
STL
20h 58m
2 stops
KLM Logo
5:45 pm - 3:30 pm
STL
-
OPO
15h 45m
2 stops
$854KLM
Fri, Sep 4 - Fri, Sep 11
Air France Logo
5:55 am - 4:17 pm
OPO
-
STL
16h 22m
2 stops
Air France Logo
3:54 pm - 3:25 pm
STL
-
OPO
17h 31m
2 stops
$855Air France
Booking Insights

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?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Porto to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Porto to Illinois is October, when tickets cost $506 (return) on average. On the other hand, the most expensive months are June and July, when the average cost of round-trip tickets is $1,138 and $1,027 respectively.

Find deals

Good to know

Low seasonMay
Cheapest flight$401
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly and prices are also 12% lower on average.
Flight from Porto to Chicago

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.

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

Information on your arrival and departure airports

Porto (OPO)