It’s generally more expensive to depart on a Saturday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.
Due to multiple factors, expect to potentially pay more when booking in July. For low rates, March can be a great choice for travel to Trivandrum. Flights to Trivandrum from Jacksonville in March are about $1,390 on average during March, but can be found for as low as $1,068.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Jacksonville to Trivandrum as you normally would.