You have to know the schedule before the flight time, normally for business should be 2 – 3 weeks before. Then you can get the better price from low cost airlines.
But if you book it 2 – 3 days before, is it a proper process?????. If you are still flexible for booking flight which is not aligned to the policy, how could we able to walk along as the policy said. Main purpose, global want to control the traveling cost by approaching a good plan.