The best pricing can be found in the month of June. Prices to Flagstaff from Champaign average $553. You can even find prices in June for less than $553, as users have found deals to Flagstaff from as low as $157. The month of August appears to be one of the more expensive times to travel to Flagstaff from Champaign. Flying in the targeted month can save you up to 356%.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Champaign to Flagstaff as you normally would.