Question : How many days should you spend in Sofia if you're flying in from Saint Louis?
Answer : Of course you're not most people, but if you were, you'd stay roughly seven days.
Question : Would you be willing to change your travel days if it saved you money?
Answer : Saturday is your cheapest day to fly in December. Flexibility is paramount when booking travel plans in order to keep costs down.
Question : Over the coming months, which airline is getting its passengers to Sofia Airport (SOF) round-trip the cheapest?
Answer : is your best bet for finding that coveted low fare.