Getting to airport in Florence from Siena

You information is vague. Are you intending to do this on the same day? Or, will you overnight in Florence before your flight out. What time is your flight? The easiest and best way to do this is to take the SITA Corse Rapide bus (express) from Siena to the SITA bus station in Florence. At the SITA bus station take the Volainbus to the airport. The first SITA bus out of Siena departs at 06:20. The trip takes 1hr.15min. Hopefully, you are not trying to do this on the same day unless your flight departs after 12:00.

Thank you Larry. Our plane is in the early afternoon, but it does seem a little stressful not to spend the night before our flight a little closer to the airport than Siena.