Due to multiple factors, expect to potentially pay more when booking in December. For low rates, April can be a great choice for travel to Ciudad Juárez. Flights to Ciudad Juárez from Santa Ana in April are about $326 on average during April, but can be found for as low as $126.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Santa Ana to Ciudad Juárez as you normally would.