$249 Find Cheap Flights from Oslo 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 to Illinois departing on 6/10. 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
Travelers love KAYAK
41.299.237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
Flight Deals

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

Wed, Apr 8 - Wed, Apr 15
Multiple Airlines Logo
7:45 am - 5:35 pm
OSL
-
ORD
16h 50m
1 stop
Multiple Airlines Logo
5:55 pm - 11:25 pm
ORD
-
OSL
22h 30m
1 stop
$381Multiple Airlines
Thu, Apr 9 - Wed, Apr 22
Icelandair Logo
1:50 pm - 6:15 pm
OSL
-
ORD
11h 25m
1 stop
Icelandair Logo
7:25 pm - 12:35 pm
ORD
-
OSL
10h 10m
1 stop
$386Icelandair
Fri, Apr 10 - Sun, Apr 26
Icelandair Logo
1:50 pm - 9:25 pm
OSL
-
ORD
14h 35m
1 stop
Icelandair Logo
7:25 pm - 12:35 pm
ORD
-
OSL
10h 10m
1 stop
$387Icelandair
Wed, Apr 8 - Wed, Apr 15
Delta Logo
6:30 am - 5:54 pm
OSL
-
MDW
18h 24m
2 stops
Delta Logo
1:24 pm - 1:45 pm
MDW
-
OSL
17h 21m
2 stops
$497Delta
Fri, Apr 10 - Sun, Apr 26
Delta Logo
6:30 am - 6:40 pm
OSL
-
MDW
19h 10m
2 stops
Delta Logo
9:27 am - 8:45 am
MDW
-
OSL
16h 18m
2 stops
$506Delta
Wed, Mar 4 - Sun, Mar 8
United Airlines Logo
6:05 am - 1:55 pm
OSL
-
STL
14h 50m
1 stop
United Airlines Logo
8:19 am - 5:10 pm
STL
-
OSL
26h 51m
2 stops
$584United Airlines
Wed, Mar 4 - Sun, Mar 8
United Airlines Logo
9:45 am - 8:26 pm
OSL
-
STL
17h 41m
2 stops
United Airlines Logo
3:23 pm - 5:10 pm
STL
-
OSL
19h 47m
2 stops
$589United Airlines
Sat, Apr 25 - Wed, Apr 29
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
$643Scandinavian Airlines
Sat, May 30 - Sat, Jun 20
Scandinavian Airlines Logo
6:00 am - 4:10 pm
TRF
-
ORD
17h 10m
1 stop
Scandinavian Airlines Logo
7:15 pm - 6:05 pm
ORD
-
TRF
15h 50m
1 stop
$645Scandinavian Airlines
Fri, Jul 17 - Sun, Jul 19
Lufthansa Logo
6:25 am - 1:25 pm
OSL
-
STL
14h 00m
1 stop
Lufthansa Logo
3:30 pm - 12:20 pm
STL
-
OSL
13h 50m
1 stop
$828Lufthansa
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 April.

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 January, when tickets cost $454 (return) on average. On the other hand, the most expensive months are July and June, when the average cost of round-trip tickets is $682 and $661 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 5 weeks before departure, which saves you about 45% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

Good to know

Cheapest flight$249
Flight from Oslo to Chicago

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.

Reviews of the top 3 airlines serving from Oslo 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 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.
7.3
Scandinavian AirlinesOverall score based on 1688 reviews
7.3Comfort
6.7Entertainment
7.6Boarding
6.7Food
8.0Crew
Airline reviews

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.

8.0 ExcellentJean-Marie, Feb 2026
CPH - ATL
Read more Scandinavian Airlines reviews

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.

Ancient aircraft (busted armrests, poor cabin temperature with no option for passenger control). Garbage everywhere. Risible checking of safely conditions on landing. Also, late.

Feels like economy sits are getting smaller especially while eating food

I was surprised how good an American airline can be - I was really impressed.

Cut out the nickel and dime pricing for "seat selection" and baggage, To do this on an international flight is just mind boggling. Seriously, why treat customers this way??? Nobody wants these hidden extra fees and everybody hates them. Also plane was too warm and no air vent, and water dripped from the ceiling at one point,

It was so hot on the plane. No air jets above the seats

Nice, quick flight. There were lots of empty seats so they told me I could sit next to the emergency exit where I would have more legroom.

They wouldn’t check in my luggage even though I had one checked bag prepaid. So I took my bag to the gate and tried to check it in there and two employees scolded me for bringing a large bag to the gate. I told them I was trying to check it in and that it was prepaid, and they said they couldn’t guarantee that it would arrive at my destination but they finally let me drop it off when boarding the plane and pick it up right after exiting the plane. There was no food, and there was no entertainment.

Overall satisfied and would fly with them again. They could improve the check-in efficiency at BOS, we got backed up because it seemed there were passengers requiring much more time for check in.

The customer service was unbeatable from the wheelchair assist team to the flight attendants. The pilot also did an excellent job managing the turbulence.

Delays at check-in, seemed like they were short ground staff at the time and some passengers needed extra processing.

Problems checking in both on the laptop and on the app. No free seating available at check-in as advertised - must pay for EVERY seat between $23 and $75. No way to cancel seat choice. App menus and site menus are not responsive, and some items are impossible to find. Crew and mobile assistance are friendly and helpful.

Again, we paid $ 328.00 for specific seats are were assigned those seats.

Having been prepared for paying for everything on board other than water, coffee and tea the service was OK. Food and drink is expensive but the food was OK if limited in scope. Plane was clean and obviously well serviced. After complaining about having to walk in wind and rain to a get a bus to the airport the same thing happened at Portland. I’m sure you could get a terminal gate flight, complimentary food and drink for not much more money without traipsing through rain and slush in Reykjavik. Not bad but not great.

Iceland air transfer was bad. They lost my luggage and I just received it 11/1

The boarding process seem to take longer than necessary, resulting in a 20+ minute delay

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.

Food was poor quality and the screens for entertainment didn’t work properly

It was a short flight, everything was good with it.

I darted through the Frankfurt airport to make my connecting flight. I asked if it was a possibility to upgrade and the agent did. This was the kindest gesture and it made up for the previous delayed flight and distress/anxiety of anticipating that Zi was going to miss my Frankfurt-Chicago connection. I cannot express my gratitude for the upgrade.. I am 5feet 10 inches do the leg space was amazing.

I meant this flight was not good, the one from Tirana to Frankfurt was better!

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.