There are one airlines offering flights to Chicago. The most direct route isn’t necessarily the cheapest – being flexible is key to finding the lowest airfare rates. For example, try searching by month to see the best time of the week to fly.
Chicago O'hare International Airport is just one of the airports in Chicago. If you're not set on a specific airport, try changing your search from Chicago O'hare International Airport to Chicago to see a broader range of flights – they might be cheaper. It usually takes about 7 hrs to fly 2794 km to Chicago O'hare International Airport.
If you're planning on going to Chicago during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.