$378 Find Cheap Flights from Oslo to Illinois - Compare and Save

1 adult
1 adult, Economy, 0 bags

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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.

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

Flight prices are below average for this route right now.

Flights to Illinois from Oslo Gardermoen Airport usually cost between $492 and $680 in November.
The lowest price found in the past 5 days was $426 on TAP AIR PORTUGAL (Nov 12-Nov 25).

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

The cheapest month for flights from Oslo Gardermoen Airport to Illinois is January, when tickets cost $486 (return) on average. On the other hand, the most expensive months are June and July, when the average cost of round-trip tickets is $755 and $730 respectively.

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

To get a below average price on the flight from Oslo Gardermoen Airport to Illinois, you should book around 2 weeks before departure, which saves you about 38% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

Good to know

Low season

January

Cheapest flight

$378
Best time to beat the crowds with an average 22% drop in price.
Most popular time to fly with an average 21% increase in price.
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 airline flying from Oslo to Illinois

 
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.
7.0
IcelandairOverall score based on 766 reviews
6.9Comfort
8.0Crew
7.2Boarding
6.9Entertainment
6.1Food
Airline reviews

Flight was ok but the food was poor, and the business chairs were not comfortable.

2.0 Mediocre明, Oct 2026
Read more Icelandair reviews

Flight was ok but the food was poor, and the business chairs were not comfortable.

Great experience in Saga Premium. Food was tasty and felt fresh. Seat was comfortable (enough) - would have wanted a layflat seat.

You should offer more than 1 cup of water on a 2.5 hour flight.

Just be careful, it is not business class, not flat seats, just as in comfort plus.

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

Comfort of seats is not good. Like sitting on a rock for 6 hours. Also no in flight food and limited beverages unless you pay is not nice. Need flight to be dark during the “night” but attendants don’t ask for shades to be lowered..

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

We had to be bussed to the plane. And it was raining. Not a pleasant experience.

The cost for the flight was quite reasonable and transferring to a new flight in Reykjavík went smoothly. There was enough time to grab a bite to eat at the airport, and the luggage transferred to the new flight with no problem.

I didn't have food nor entertainment. Lots of leg room and seat was comfortable

More options for your flight from Oslo to Illinois

Complete your trip to Illinois with a hotel stay or car rental