Due to multiple factors, expect to potentially pay more when booking in August. For low rates, December can be a great choice for travel to Long Beach. Flights to Long Beach from Walla Walla in December are about $531 on average during December, but can be found for as low as $232.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Walla Walla to Long Beach as you normally would.