We've gone through them all to help you find the right flight for you. If you can't find what you're looking for, consider widening your search by looking at flights from a different airport.
But when you fly is just as important as who you fly with. If you're flexible on dates, try searching by month to see when the cheapest flights are.
Or you could broaden your search by looking at flights to other airports in the USA to see if there are any cheaper options.
Did you know you can also compare hotel and car hire prices in the USA with Netflights? Take a look to get an idea of prices in Champaign.