$344 Find Cheap Flights from Oslo 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 Oslo to Illinois departing on 9/15. 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

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Book Cheap Oslo 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 Oslo 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 Oslo to Illinois

Sat, Aug 22 - Sun, Sep 6
Finnair Logo
8:55 pm - 5:15 pm
OSL
-
ORD
27h 20m
2 stops
Finnair Logo
9:30 pm - 4:35 pm
ORD
-
OSL
12h 05m
1 stop
$581Finnair
Sat, Aug 22 - Sun, Sep 6
Scandinavian Airlines Logo
6:00 am - 4:10 pm
TRF
-
ORD
17h 10m
1 stop
Scandinavian Airlines Logo
7:15 pm - 2:30 pm
ORD
-
TRF
12h 15m
1 stop
$583Scandinavian Airlines
Fri, Aug 21 - Sun, Sep 6
Icelandair Logo
4:30 pm - 9:25 pm
OSL
-
ORD
11h 55m
1 stop
Icelandair Logo
7:25 pm - 3:25 pm
ORD
-
OSL
13h 00m
1 stop
$584Icelandair
Mon, Aug 31 - Tue, Sep 15
Scandinavian Airlines Logo
9:00 pm - 4:10 pm
OSL
-
ORD
26h 10m
1 stop
Scandinavian Airlines Logo
7:15 pm - 5:20 pm
ORD
-
OSL
15h 05m
1 stop
$590Scandinavian Airlines
Thu, Dec 24 - Sun, Jan 10
American Airlines Logo
7:05 am - 7:15 pm
OSL
-
ORD
19h 10m
1 stop
American Airlines Logo
1:31 pm - 10:35 am
ORD
-
OSL
14h 04m
2 stops
$592American Airlines
Sat, Oct 31 - Wed, Nov 4
Scandinavian Airlines Logo
6:00 am - 5:45 pm
TRF
-
ORD
17h 45m
1 stop
Scandinavian Airlines Logo
7:15 pm - 2:05 pm
ORD
-
TRF
11h 50m
1 stop
$592Scandinavian Airlines
Sat, Aug 22 - Sun, Sep 6
Lufthansa Logo
6:15 am - 2:55 pm
OSL
-
ORD
15h 40m
1 stop
Lufthansa Logo
10:30 pm - 12:05 am
ORD
-
OSL
18h 35m
1 stop
$598Lufthansa
Thu, Dec 24 - Sun, Jan 10
British Airways Logo
11:45 am - 11:59 pm
OSL
-
ORD
19h 14m
2 stops
British Airways Logo
1:31 pm - 10:35 am
ORD
-
OSL
14h 04m
2 stops
$601British Airways
Sat, Aug 22 - Sun, Sep 6
Icelandair Logo
4:30 pm - 9:25 pm
OSL
-
ORD
11h 55m
1 stop
Icelandair Logo
10:25 pm - 3:25 pm
ORD
-
OSL
10h 00m
1 stop
$603Icelandair
Mon, Jul 20 - Fri, Jul 24
Lufthansa Logo
4:45 pm - 11:36 pm
OSL
-
STL
37h 51m
2 stops
Lufthansa Logo
3:30 pm - 9:05 am
STL
-
OSL
34h 35m
1 stop
$1,031Lufthansa
Booking Insights

KAYAK's insights & trends for Oslo to Illinois flights

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

How much is a round-trip flight from Oslo to Illinois?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Oslo to Illinois departing in August.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Oslo 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 Oslo to Illinois is February, when tickets cost $304 (return) on average. On the other hand, the most expensive months are July and May, when the average cost of round-trip tickets is $509 and $410 respectively.

How far in advance should I book a flight from Oslo to Illinois?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Oslo to Illinois, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Oslo to Illinois, you should book around 4 weeks before departure, which saves you about 46% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 25 weeks before departure.

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FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Oslo 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 Oslo to Illinois.

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

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

Cabin class types available on flights to Illinois

Cabin classes available on flights to Illinois. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.
First Class flights from Oslo to Illinois
Business Class flights from Oslo to Illinois
Premium Economy Class flights from Oslo to Illinois
Economy Class flights from Oslo to Illinois