$368 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 9/28. 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

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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Cheap Flights from Oslo to Illinois

 
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 23 - Mon, Sep 15
Icelandair Logo
1:50 pm - 6:15 pmOSL-ORD
11h 25m1 stop
Icelandair Logo
7:25 pm - 12:35 pmORD-OSL
10h 10m1 stop
$426Icelandair
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Sat, Aug 23 - Mon, Sep 15
Icelandair Logo
4:30 pm - 6:15 pmOSL-ORD
32h 45m1 stop
Icelandair Logo
7:25 pm - 12:35 pmORD-OSL
10h 10m1 stop
$429Icelandair
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Thu, Sep 11 - Mon, Sep 15
Delta Logo
6:30 am - 8:35 pmOSL-STL
21h 05m2 stops
Delta Logo
5:30 pm - 6:50 pmSTL-OSL
18h 20m2 stops
$455Delta
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Thu, Aug 14 - Tue, Aug 26
KLM Logo
6:30 am - 2:10 pmOSL-ORD
14h 40m1 stop
KLM Logo
4:20 pm - 11:05 amORD-OSL
11h 45m1 stop
$457KLM
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Thu, Aug 14 - Mon, Aug 25
KLM Logo
6:30 am - 2:10 pmOSL-ORD
14h 40m1 stop
KLM Logo
4:20 pm - 1:40 pmORD-OSL
14h 20m1 stop
$458KLM
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Thu, Sep 11 - Sun, Sep 14
Delta Logo
6:30 am - 5:36 pmOSL-ORD
18h 06m2 stops
Delta Logo
4:20 pm - 6:35 pmORD-OSL
19h 15m1 stop
$465Delta
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Thu, Aug 14 - Mon, Aug 25
Scandinavian Airlines Logo
2:55 pm - 4:10 pmTRF-ORD
32h 15m1 stop
Scandinavian Airlines Logo
7:15 pm - 2:20 pmORD-TRF
12h 05m1 stop
$534Scandinavian Airlines
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Thu, Aug 14 - Tue, Aug 26
Scandinavian Airlines Logo
2:55 pm - 4:10 pmTRF-ORD
32h 15m1 stop
Scandinavian Airlines Logo
7:15 pm - 2:20 pmORD-TRF
12h 05m1 stop
$563Scandinavian Airlines
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Tue, Jul 15 - Sun, Jul 20
British Airways Logo
7:25 pm - 1:50 pmOSL-ORD
25h 25m1 stop
British Airways Logo
9:15 pm - 10:25 amORD-OSL
30h 10m1 stop
$572British Airways
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Wed, Jul 9 - Sat, Jul 19
British Airways Logo
5:05 pm - 5:00 pmOSL-ORD
30h 55m1 stop
British Airways Logo
7:10 pm - 11:35 pmORD-OSL
21h 25m1 stop
$576British Airways
Find Deal
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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.

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 November, when tickets cost $397 (return) on average. On the other hand, the most expensive months are July and June, when the average cost of round-trip tickets is $670 and $624 respectively.

What’s the cheapest day of the week to fly from Oslo to Illinois?

The average price of all round-trip flights from Oslo to Illinois clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Illinois on a Thursday and more expensive on a Saturday. On your return trip to Oslo, you should consider flying back on a Tuesday, and avoid Saturdays for better deals.

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 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 12 weeks before departure.


Good to know

Cheapest flight$368
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.

  • What is the cheapest time of day to fly to Illinois?

    The cheapest time of day to fly to Illinois is generally in the morning, when round-trip flights cost $491 on average. Morning departures are around 26% cheaper than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the evening, which is peak travel time and where the average cost of a ticket is $662.

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 1387 reviews
6.5Entertainment
7.6Boarding
7.2Comfort
6.6Food
7.9Crew
Airline reviews

Standard short hop flight. No food, no entertainment. Just get in, get something to drink, and try to be as comfortable as you can for an hour.

8.0 ExcellentAnonymous, Jun 2025SEA - MFR
Read more Scandinavian Airlines reviews

Standard short hop flight. No food, no entertainment. Just get in, get something to drink, and try to be as comfortable as you can for an hour.

Travelling coach, comfort is all in one's perspective. Movie choices were great. Food was OK. Flight crew were pleasant. Tip: If they come through asking if you want tea or coffee, do not ask for water. They get miffed. So use the call button after they pass through.

Name change on tickets for a misspelled name was very hard to change

Would be nice if the front toilets could be used by everyone.

Sat on runway for 1.5 hours waiting on winds to change so we could take off. The pilots did an amazing job getting up in the air when they had permission to take off.

They cancelled our flight home less than 24 hours before it was supposed to leave. It partially ruined our last day because I was on the phone trying to get 5 people home and the stress that it causes. We still arrived at the airport with no definite flight plans. The actual flight was good but my kids really misses the kids meals I had ordered for them which obviously didn’t make it to the new flight.

Maybe more diverse entertainment. Although the inflight cameras were amazing 10/10

Boarding was chaotic and the flight left late but arrived at a decent time. This may have been because of the sxsw festival that was going on.

I was pleasantly surprised as it was my first time flying with them. The seats were comfortable with more legroom than usual. The service was great too! The entertainment was good but could use a few more new movies.

Nothing special or negative. Pretty typical flight…no freebies in the way of food etcetera, but none were expected.

Iceland airlines doesn't provide any meal on flight to and from New York, except water and soda. Airline over charge for checking in luggage. I'm really upset.

Iceland airlines doesn't provide any meal on flight to and from New York, except water and soda. Airline over charge for checking in luggage. I'm really upset. If there is option to use another company, I suggest to other people use them.

I had an exit row and so was Comfortable on the long flight.

The seats on this airline are sooo small, even for a petite person. I felt like the seat tilted forward and I was fighting to stay in it. The lavatory is horribly small, with a wet floor because the sink is so small you can't help but splash the water all over when washing up.

Smooth efficient airline. Think they should have their own bag drop as the queue took 30mins to bmscan and drop

Good. Lacking overhead bin space. No food offered but you can order online or in flight and pay for snacks.

No food was served for 7.5 hrs flight. When our flight changed to other airlines due to wether issue, our seats booked with no checked in luggage when I already payed for. We end up to pay 90 euro per suitcase.

Booked with Kayak… Economy Class it said. I had filtered for 1 checked bag. Get to boarding and it says I have Economy Light w/ no checked bags. $136 each way for baggage now. Do not use smartfares.com. Very misleading and a terrible start to this trip.

Overall good. I was surprised how easy it was to get from plain to plain in such a short time. Food choices were not so great and quite expensive. Entertainment was ok. Flights were smooth.

Horrible. The flight was delayed by over 3 hours but updates were barely provided. Boarding started 3 hours late then stopped because their system crashed. So now, passengers were standing for 15 minutes in the open waiting to get boarding passes scanned and get on a bus. Duty-free closed around 4-4:30. Only 1 food outlet was open and it was super slow and busy since it was serving passengers from multiple flights. So a number of passengers couldn't buy meals at the terminal. Since the flight was delayed by over 3 hours, we could have been offered snacks on-board. Nothing. The seats barely reclined. In-flight entertainment options were pitiful. Overall, a miserable experience. Never flying on Icelandair ever again. :(

Better synchronizing the boarding processes. The audio announcements, the personnel and the digital signage were not saying the same thing. All confusion.

The first class seats were unusable, mine at the end of the flight, my husband's in the middle of the flight, and the one next to me was unusable either, they had to move the person to another seat.

Last minute gate change. Didn’t put our TSA global on our trip even though we asked multiple times to confirm. Did not help with food when could not eat what was served.

Our luggage didn’t arrive with us, that puts a damper on the whole trip.

The cabin was bit colder than I like but the crew members looked after us very well. They did even offer hot water bottle and hot chocolate. I cannot rate the crew enough excellent is not good enough. They really were wonderful.

Boarding is always a challenge as folks in al groups crowd around for no reason, but crew handled it well. I once again applaud the LHR ground baggage staff as they got our bags from a flight at Terminal 5A to a flight in Terminal 5C within 40 minutes...amazing!

This flight from London to Chicago was actually on an AA airline. I did book through BA but the flight was AA. Great flight, hectic in Chicago, I wouldn't choose to fly through Chicago again, but that's not the airlines fault. The flight itself was great.

Push back is not working when I complaint a male staff he told me that most of the seats are like that so we can’t do anything

Seats were way too small. I got claustrophobic waiting for trash from meal to be taken away. I couldn't move to even close my tray until trash was taken.

Was 3 hrs delayed and my poor friend I met in Barcelona was waiting at airport for 3 hrs. Dallas airport was awful

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.

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