Question : Should you take that vacation to Sofia in the next 30 days?
Answer : Since low prices are preferred, look at Feb 27th. As of Feb 20th, it's showing the cheapest ticket sales at $741. That is 8% below the average price for this route, so you can spend that extra cash on an adventure rather than the flight.
Question : How much should a trip from Ontario (ONT) to Sofia (SOF) cost?
Answer : Ranging from $741 to $971, prices for ONT to SOF change a lot less than most routes from the United States. Prices tend to be lower the further out you book.
Question : How long do most people visit Sofia?
Answer : Of course you're not most people, but if you were, you'd stay roughly 217 days.