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$599+ Cheap flights from Trondheim (TRD) to Illinois

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/25. Fares are subject to change and may not be available on all flights or dates of travel.
TRD — ORD
May 3 — May 101
Sat 5/3
Sat 5/10
1 adult, Economy
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Cheap flight deals from Trondheim to Illinois

Keep the following information in mind while searching for Trondheim to Illinois flight deals. Data was last updated April 28, 2025.

Round-trip from

$599
(American Airlines)

Popular in

August

Cheapest in

November

Average price

$489
From Trondheim Vaernes to Illinois
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($124 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
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Find flight deals from Trondheim to Illinois

Cheapest flights from Trondheim to Illinois
Explore the most affordable flight options available from Trondheim to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 28, 2025.

This American Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/2510:00 amTRD - ORD
2 stops32h 45mMultiple Airlines
Sun 6/19:15 pmORD - TRD
2 stops29h 15mMultiple Airlines
Deal found 4/28$599
This Ovago deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/2510:00 amTRD - ORD
1 stop14h 50mFinnair
Sun 6/19:30 pmORD - TRD
1 stop29h 00mFinnair
Deal found 4/28$603
This FlightHub deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/257:45 pmTRD - ORD
2 stops35h 14mScandinavian Airlines
Sun 6/17:15 pmORD - TRD
1 stop12h 05mScandinavian Airlines
Deal found 4/28$621

Cheapflights Fare Finder

Customize your flight search to find flights from Trondheim to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 28, 2025.
Use the filters below to find and compare flights from Trondheim to Illinois that are best for you.

Fly from

Trondheim

Fly to

Illinois

Route

Depart

Return

Price

TrondheimChicago

TRD - ORD

TRDORD

Trondheim Vaernes

Sun 5/25

10:00 am-11:45 am

2 stops32h 45m

Chicago O'Hare Intl

Sun 6/1

9:15 pm-9:30 am

2 stops29h 15m

$599

TrondheimChicago

TRD - ORD

TRDORD

Trondheim Vaernes

Sun 5/25

10:00 am-5:50 pm

1 stop14h 50m

Chicago O'Hare Intl

Sun 6/1

9:30 pm-9:30 am

1 stop29h 00m

$603

TrondheimChicago

TRD - ORD

TRDORD

Trondheim Vaernes

Sun 5/25

7:45 pm-11:59 pm

2 stops35h 14m

Chicago O'Hare Intl

Sun 6/1

7:15 pm-2:20 pm

1 stop12h 05m

$621

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Best time to book a flight from Trondheim to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Trondheim with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Trondheim to Illinois

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated April 28, 2025.
Finnair
7.6
Good
1,273 reviews

Boarding

7.6

Comfort

7.4

Crew

8.1

Food

6.7

Entertainment

6.9

Overall

7.6

Reviews

1 / 20
2.0
Mediocre

Rowland,Dec 2024

HEL - HKG

Finnair, a large European airline, have a very poor boarding practice whereby they collect every passenger waiting at the gate into an even smaller closed in area after checking passports (again) and boarding cards - then simply open the boarding causing a crowd crush as ALL passengers attempt to board all at once. Surely a more controllable method these days is to board via seat row numbers?
Finnair
7.6
Good
1,273 reviews
Finnair
7.6
Good
1,273 reviews

Boarding

7.6

Comfort

7.4

Crew

8.1

Food

6.7

Entertainment

6.9

Overall

7.6

Reviews

1 / 20
2.0
Mediocre

Rowland,Dec 2024

HEL - HKG

Finnair, a large European airline, have a very poor boarding practice whereby they collect every passenger waiting at the gate into an even smaller closed in area after checking passports (again) and boarding cards - then simply open the boarding causing a crowd crush as ALL passengers attempt to board all at once. Surely a more controllable method these days is to board via seat row numbers?
Scandinavian Airlines
7.3
Good
1,345 reviews
Finnair
7.6
Good
1,273 reviews

Boarding

7.6

Comfort

7.4

Crew

8.1

Food

6.7

Entertainment

6.9

Overall

7.6

Reviews

1 / 20
2.0
Mediocre

Rowland,Dec 2024

HEL - HKG

Finnair, a large European airline, have a very poor boarding practice whereby they collect every passenger waiting at the gate into an even smaller closed in area after checking passports (again) and boarding cards - then simply open the boarding causing a crowd crush as ALL passengers attempt to board all at once. Surely a more controllable method these days is to board via seat row numbers?

Related info for your journey

Find useful and relevant information for your journey from Trondheim to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Trondheim to Illinois?

    If you book a flight to Illinois from Trondheim, you will be flying from Vaernes, which is the city’s only airport. Trondheim Vaernes (TRD) is located 16.4 mi from the center of Trondheim.

  • Can I find deals for flights from Trondheim to Illinois that include hotel bookings?

    Yes. In addition to deals on Trondheim to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Trondheim to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Trondheim to Illinois.

  • Can I find deals for business class flights from Trondheim to Illinois?

    Yes. Cheapflights offers flight deals from Trondheim to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Trondheim to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Trondheim to Illinois (average of $245). Flying from Trondheim to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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