Yes, cars are available to be rented out for an entire month in St Petersburg.
Generally, for a better deal it’s recommended to book in a timely manner (to save up to 26%). Cheapflights recommends you book around 24 days prior to your deserved date. Booking as early as you can also increases the likelihood that you’ll get the ideal car.
The average gas price in St Petersburg is 15,671 ₫/liter over the past month, costing you anywhere between 705,201 ₫ and 1,018,624 ₫ to fill up a car’s gas tank.