What is the cheapest way to fly from Prague to Istanbul?

This April, I'm going with my husband and our preschool-age son to meet up with my in-laws in Turkey. We want to visit Prague on the way, and want to find a cheap flight to Istanbul or Bodrum. We would travel by train or fly to another city to get a better airfare--as it is it looks like there are no direct flights from the Czech Republic to Turkey. What would be some good options for getting to Turkey? Buses are not a good option because we have a young child--but we'd consider short (like less than half a day) train trips. Thanks in advance!