Wasps will travel a good distance, but if you are seeing a lot of wasps in a small area, its usually, because they are feeding on a specific plant, usually a tree or shrub, and can usually be heard and large numbers seen on and around this tree or shrub, if this is not the case you will just have to try and follow the general direction they are flying. Remember to look downwards as well as up, they will nest in bushes trees, compost heaps, holes in the ground, even in a well kept lawn and the holes can be difficult to spot, you need to be looking for wasp activity and they will lead you to the nest.
Good luck
Of course it could just be that you have a large amount of plants/flowers that are attracting them generally, not a lot you can do in that situation I'm afraid.