To save up to 20% on this flight, we recommend booking at least 44 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 Stockton from $117 1-2 weeks out and tickets from $137 for flights departing within the next 72 hours.
Due to multiple factors, expect to potentially pay more when booking in April. For low rates, February can be a great choice for travel to Stockton. Flights to Stockton from Illinois in February are about $121 on average during February, but can be found for as low as $61.