$394 Find Cheap Flights from Oslo Airport to Illinois

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 Gardermoen to Illinois departing on 10/26. 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 Oslo 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 Oslo to Illinois, as well as popular online travel agencies
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Book Cheap Oslo Gardermoen 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 Gardermoen 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 Gardermoen to Illinois

Mon, Jun 1 - Tue, Jun 16
Icelandair Logo
4:30 pm - 6:15 pm
OSL
-
ORD
32h 45m
1 stop
Icelandair Logo
10:25 pm - 12:35 pm
ORD
-
OSL
31h 10m
1 stop
$572Icelandair
Wed, Sep 9 - Sun, Sep 13
Icelandair Logo
4:30 pm - 9:25 pm
OSL
-
ORD
11h 55m
1 stop
Icelandair Logo
7:25 pm - 12:35 pm
ORD
-
OSL
10h 10m
1 stop
$579Icelandair
Mon, Oct 26 - Thu, Oct 29
Icelandair Logo
1:10 pm - 6:20 pm
OSL
-
ORD
11h 10m
1 stop
Icelandair Logo
7:30 pm - 11:35 am
ORD
-
OSL
10h 05m
1 stop
$597Icelandair
Mon, Oct 26 - Thu, Oct 29
Icelandair Logo
1:10 pm - 6:20 pm
OSL
-
ORD
11h 10m
1 stop
Icelandair Logo
7:30 pm - 11:35 am
ORD
-
OSL
10h 05m
1 stop
$601Icelandair
Mon, Oct 26 - Thu, Oct 29
American Airlines Logo
7:20 am - 11:53 pm
OSL
-
ORD
22h 33m
2 stops
American Airlines Logo
9:40 pm - 11:35 pm
ORD
-
OSL
19h 55m
1 stop
$606American Airlines
Mon, Jun 1 - Tue, Jun 16
Multiple Airlines Logo
7:45 am - 3:00 pm
OSL
-
ORD
14h 15m
1 stop
Multiple Airlines Logo
8:50 pm - 11:20 pm
ORD
-
OSL
19h 30m
1 stop
$611Multiple Airlines
Mon, Oct 26 - Thu, Oct 29
American Airlines Logo
7:20 am - 11:53 pm
OSL
-
ORD
22h 33m
2 stops
American Airlines Logo
9:40 pm - 10:30 am
ORD
-
OSL
30h 50m
1 stop
$613American Airlines
Wed, Jun 3 - Sun, Jun 7
Air Canada Logo
6:35 am - 8:25 pm
OSL
-
STL
20h 50m
2 stops
Air Canada Logo
2:15 pm - 5:15 pm
STL
-
OSL
20h 00m
2 stops
$641Air Canada
Wed, Jun 3 - Sun, Jun 7
Multiple Airlines Logo
6:35 am - 1:25 pm
OSL
-
STL
13h 50m
1 stop
Multiple Airlines Logo
1:05 pm - 3:15 pm
STL
-
OSL
19h 10m
2 stops
$694Multiple Airlines
Wed, Jun 3 - Sun, Jun 7
Lufthansa Logo
6:35 am - 1:25 pm
OSL
-
STL
13h 50m
1 stop
Lufthansa Logo
3:30 pm - 12:05 am
STL
-
OSL
25h 35m
1 stop
$733Lufthansa
Booking Insights

KAYAK's insights & trends for Oslo Gardermoen to Illinois flights

Get data-powered insights and trends into flights from Oslo Gardermoen 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 Gardermoen Airport 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 Gardermoen Airport to Illinois departing in June.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Oslo Gardermoen Airport 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 Gardermoen Airport 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 $482 and $410 respectively.

How far in advance should I book a flight from Oslo Gardermoen Airport 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 Gardermoen Airport 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 Gardermoen Airport to Illinois, you should book around 5 weeks before departure, which saves you about 49% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$375
Best time to beat the crowds with an average 2% drop in price.
Most popular time to fly with an average 24% increase in price.
Flight from Oslo to Chicago

FAQs - booking Illinois flights

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

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Oslo Airport 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 Airport 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 Airport 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 Airport 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 Airport to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Oslo Gardermoen to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Oslo to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Oslo Gardermoen to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
Scandinavian AirlinesOverall score based on 1783 reviews
7.7Boarding
8.0Crew
6.7Food
6.7Entertainment
7.3Comfort
Airline reviews

My daughter always gets sick when we order the gluten free meal option. Internet didn’t work as advertised.

8.0 ExcellentT, May 2026
CPH - ORD
Read more Scandinavian Airlines reviews

My daughter always gets sick when we order the gluten free meal option. Internet didn’t work as advertised.

All went smoothly. That's what I want on a long flight.

Really good. Everything went smoothly. That's what I hope for when I'm on a long flight, especially with multiple changes. Thank you SAS.

I expected more, but they will nickel and dime you for everything. I did not enjoy flying with this airline.

Curious and efficient service ! First time flying with SAS and very pleased!

I wish they have given us explanations for the delays. And the rebooking process in Copenhagen was too long. I had to wait about 4 hours before they assign me a hotel. From there the handling process (accommodation, transportation and meal) was excellent.

Our trip plan from Kayak stated we were flying SAS. That was not true. The first leg was a Delta flight. We wasted 25 minutes before finding out to check in with the correct airline. Then our SAS flight for the second leg arrived 25 minutes late, and our third leg flight with SAS closed the gate knowing the flight delay was SAS’s fault, and that this flight would only be backed up 5 minutes. The final kicker was that between Delta and SAS, they lost all our checked luggage.

Since our earlier flight was delayed, we missed this flight and were rerouted on Lufthansa 2 days later.

Scandinavian Airlines is terrible. Flight was late. Lost luggage. Rude flight attendants. Terrible experience.

The flight was very cold, and the seats were rather uncomfortable. The food has been better on our other SAS experiences. Most significantly, the luggage with most of my wife's personal items and clothes didn't make the flight. Hoping for a quick resolution, but no real opportunity to speak with a Human has us concerned.

The Check-in process at CDG was confusing and the crew was not helpful. But the flight was on-time and that is most important to me.

At least one soda free, felt like I was nickeled to death.

Friendly flight crew. Airplane (757) configured as a domestic flight (no lie-flat seats) & no advanced meal selection.

Was a bit surprised that Icelandair flies a domestically configured 757s on long-haul flights to Iceland (no lie-flat seats in business class).

The Icelandair crew was so kind!!! Thank you for making my first trip to Paris a great one!

I am not going to fillo this out for each leg of my trip. My first review holds for the experience

I had no idea that my ticket only paid for my right to get on the plane. They charged me $130 for my carry-on bag because it was 1 inch too big she claimed but it wasn’t! Then they wanted another fee for everything. I had no idea that Icelandair had changed to such a bargain basement airline. I was very disappointed.

Second time with Saga Premium, everything was fab, but the entertainment centre on both my flights didn't work, plus the seat on the NY to Rek flight (Airbus) was so solid and so uncomfortable. The 737Max flight's seat was much, much better.

The most uncomfortable seat i’ve ever had on a flight

Waiting area on top of stairs before Boarding the bus wasn’t great. Took a long time to load the bus to gate.

The legroom was lacking and the entertainment system lacked adequate selection of older films. Modern films are generally not very good.

Perfect airline, super friendly, great service, tasty food. Would fly again.

Everything could have been better. What needed to be wrong with United went wrong

It was good. The seats in economy weren’t bad

Very good. Comfortable and I felt well taken care of from start to finish

We were in premium economy seats that appeared to be locked in plae, No reclining. My aching back.

I don’t understand how they charge as much as they do for such a poor experience

I wish the plane had pod seating for business class. I had a window seat (8K) and I had to climb over the person sitting on the aisle when I needed to get up. Also there is no partition between the seats for privacy when sleeping. The Asian airlines have much nicer business class seating. Their seats are wider for better comfort when sleeping.

The seat space seemed small especially when the person ahead reclined but other than that, very good.

Luggage transfer in Chicago was not performed in time. I received my luggage at my destination two days later.

Everything you need to know for your flight from Oslo Gardermoen to Illinois

Information on your arrival and departure airports