There is some decent flexibility with the dates you posted, according to ITA your cheapest ticket option is on Alitalia from VCE (figured it was the same distance as VIE), for $785. Plenty of dates available within your range.

If you would rather fly from BUD or VIE, you can do that for $825 on Air France. Same dates.

Expect this thread to be moved though as this does not pertain to mileage runs.