354 - 487 CAD
Travelling from most locations, it is best to book your flight to Illinois during the month of February for the best deal, although there are other times of the year which offer great deals as well.
Most flyers found that booking flight tickets 60 days in advance of their planned departure date is, on average, the best time to get cheap flights to Illinois.
From most locations, the cheapest day to fly to Illinois is Wednesday. Most users found that departing on a Sunday was most expensive.
Generally, when visiting Illinois, noon flights represent the best value. evening flights are likely to have higher prices.