I am applying for a Schengen visa for a month and my travel dates will be within this month for a period of 15 days. I can give approximate dates of intended travel and return but could not book tickets because of uncertainty of visa being obtained in time. I can produce a ticket when visa is confirmed.
In a Schengen visa application - you don't apply for a specific period, you apply for a specific itinerary and if you want single, dual or multiple entries.
Of all the Schengen documentation I have seen, it never mentions a ticket, but plenty of places mention a reservation; which makes sense as you may not be granted the visa.
Typical requirements for Schengen (tourist) visa:
- Proof of accommodation (like a hotel reservation for the dates)
- Proof of funds to cover your trip
- Proof of travel insurance
- Proof of family ties/home ties
Normal requirements - passport current for 6 months past your travel dates, a passport sized photo on a white background, copy of your passport, copy of your residency permit (if you are a permanent resident in the country you are applying).