$248 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 5/16. 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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Flight Deals

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

Wed, Apr 8 - Wed, Apr 15
Multiple Airlines Logo
7:45 am - 2:55 pm
OSL
-
ORD
14h 10m
1 stop
Multiple Airlines Logo
10:30 pm - 11:25 pm
ORD
-
OSL
17h 55m
1 stop
$359Multiple Airlines
Wed, Apr 8 - Wed, Apr 15
Multiple Airlines Logo
12:50 pm - 12:20 pm
OSL
-
ORD
30h 30m
2 stops
Multiple Airlines Logo
10:30 pm - 11:25 pm
ORD
-
OSL
17h 55m
1 stop
$366Multiple Airlines
Tue, May 5 - Wed, May 13
Icelandair Logo
1:50 pm - 6:15 pm
OSL
-
ORD
11h 25m
1 stop
Icelandair Logo
7:25 pm - 3:25 pm
ORD
-
OSL
13h 00m
1 stop
$402Icelandair
Sat, Apr 18 - Fri, May 1
Icelandair Logo
4:30 pm - 6:15 pm
OSL
-
ORD
32h 45m
1 stop
Icelandair Logo
10:25 pm - 3:25 pm
ORD
-
OSL
10h 00m
1 stop
$408Icelandair
Sat, Apr 18 - Fri, May 1
Icelandair Logo
4:30 pm - 6:15 pm
OSL
-
ORD
32h 45m
1 stop
Icelandair Logo
10:25 pm - 3:25 pm
ORD
-
OSL
10h 00m
1 stop
$409Icelandair
Wed, Apr 8 - Wed, Apr 15
Finnair Logo
12:50 pm - 12:20 pm
OSL
-
ORD
30h 30m
2 stops
Finnair Logo
5:55 pm - 7:45 pm
ORD
-
OSL
18h 50m
2 stops
$445Finnair
Wed, Mar 11 - Sun, Mar 15
Lufthansa Logo
6:05 am - 2:55 pm
OSL
-
STL
14h 50m
1 stop
Lufthansa Logo
5:41 pm - 3:20 pm
STL
-
OSL
15h 39m
2 stops
$545Lufthansa
Wed, Mar 11 - Sun, Mar 15
Lufthansa Logo
9:45 am - 11:51 pm
OSL
-
STL
20h 06m
2 stops
Lufthansa Logo
5:41 pm - 3:20 pm
STL
-
OSL
15h 39m
2 stops
$552Lufthansa
Wed, Apr 8 - Wed, Apr 15
Delta Logo
6:30 am - 5:22 pm
OSL
-
MDW
17h 52m
2 stops
Delta Logo
9:27 am - 8:45 am
MDW
-
OSL
16h 18m
2 stops
$592Delta
Fri, May 1 - Fri, May 8
Delta Logo
6:30 am - 5:58 pm
OSL
-
MDW
18h 28m
2 stops
Delta Logo
6:36 pm - 4:20 pm
MDW
-
OSL
14h 44m
2 stops
$671Delta
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 April.

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 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 $678 and $663 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 45% 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$248
Best time to beat the crowds but there is an average 9% increase in price.
Most popular time to fly with an average 28% 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 airlines flying 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.
7.1
IcelandairOverall score based on 617 reviews
6.2Food
7.0Entertainment
7.2Boarding
7.0Comfort
8.1Crew
Airline reviews

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.

10.0 ExcellentAnonymous, Feb 2026
KEF - GOH
Read more Icelandair reviews

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.

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

Never again. Terrible hospitality and human decency for an international flight. No food, no snacks, no beverages, blankets, pillows, limited entertainment. Tiny seats without any cushion and some do not even recline. I was shocked that they did not charge for seat belts. Never in my life have I witness asking for "spare change" for charity before landing on both legs of the flight. Icelandair can contribute on their own to said, so called, children's charity with the money saved from providing 3 centimeters of tea and water to hungry and dehydrated passengers.

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.

They had a 4 hour delay and left my luggage in Iceland and it didn’t arrive in Portland until 11/1

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

It was too cold in the plane my feet froze

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.

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.

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

Information on your arrival and departure airports