Users have found that booking a flight from Illinois to San Diego at least 33 days early can save you up to 19% on average compared to booking a flight this week. If booking 33 days before your flight isn’t an option for you, users have found flights from Illinois to San Diego for as little as $86 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $107 for flights departing within the next 3 days.
Due to multiple factors, expect to potentially pay more when booking in March. For low rates, May can be a great choice for travel to San Diego. Flights to San Diego from Illinois in May are about $98 on average during May, but can be found for as low as $58.