The idea that flight search tools have a decisive impact on the overall budget by offsetting a high cost of living is a dangerous oversimplification.
The past clearly shows us that the cost of living is not a variable that can be easily compensated for with a cheap flight.
Flight prices can vary, but they do not change the reality of local prices for food, transportation, or housing.
For example, even if I found a dirt-cheap flight from Tunis to Europe, the cost of living there remains a huge barrier and rent does not become affordable.
A solid overall budget is needed from the start, not just a plane ticket.