Leaving on a Tuesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 100% on the overall cost on flights from Chicago to Trondheim.
One of the essential ways to save on airfare from Chicago to Trondheim is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the morning could potentially save you up to 39% on airfare.