Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ho Chi Minh City to Florence as you normally would.
Yes, there are multiple flights from Ho Chi Minh City to Florence for under 24,074,600 ₫. The cheapest flight booked recently is on Multiple Airlines for just 24,074,528 ₫, but on average you can expect to pay 44,545,232 ₫.
The cheapest flight price from Ho Chi Minh City to Florence is 26,624,172 ₫. On average you can expect to pay 48,604,888 ₫. The most popular route, (Ho Chi Minh City - Florence Peretola), can usually be booked for 29,198,332 ₫.