Before rushing to think that flight search tools balance everything, consider the worst-case scenario and what happens if the calculation goes awry.
You can find a cheap flight ticket, but the real cost of living on-site can quickly cancel out these savings if you haven't anticipated unforeseen increases.
For example, in Berlin, even with a cheap flight, a sudden increase in seasonal rents or the price of groceries can drain the budget faster than expected.
The threshold for unforeseen events is often exceeded without adequate protection against local market fluctuations.