Travelers have found it’s best to book a flight 17 days in advance to save up to 8% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 17 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Chicago to California 1-2 weeks in advance for as low as $87, or $97 for flights within the next 24 hours.
September can be a great time to fly to California from Chicago with a flight ticket averaging about $95. Cheapflights users have found deals in the month of September for as cheap as $46. The most expensive prices can be found in the month of December.