To save up to 26% on this flight, we recommend booking at least 23 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Illinois to Delaware from $179 1-2 weeks out and tickets from $231 for flights departing within the next 72 hours.
Our data shows that July tends to be the cheapest month to fly to Delaware from Illinois. Users have commonly found prices around $184 for the month, but tickets can be as low as $52. Due to multiple factors, prepare for potentially higher prices in December.