If you in a hurry and just want to book onle quickly 

Click here

If you stay at a hotel there are buses which take you to the caves in Sacromonte  ask at reception.

A bus will come round to your hotel and pick you up.

It is quite touristy, fairly expensive and you may feel like a sausage on a conveyor belt.

It is also possible to just go to the yourself Sacromonte at around 9pm and go to a Tablao.
In the summer and at peak times there are performances every night 
The palce I would recommend in this case is the Canastera.
Info here:
https://granadainfo.com/canastera/english.htm

In my opinion it is best to be in a long cave with the audience on chairs at the sides, that way you can get very close to the dancers and the atmosphere is good.

Another place which has a long cave rather than a stage is the Rocio.
Info here
https://granadainfo.com/rocio/english.htm

A good alternative to going to a Tablao  is going to a restaurant where Flamenco is performed.

There are nightly performances at the Zoraya Restaurant.
Info here:


I have seen that there is Flamenco and wine tasting etc at the
El sur de Granada Tapas bar/local products shop.
Info here
https://granadamap.com/alsur/indexsp.htm 
I haven't been there yet.


If you are a flamenco aficcionado the Plateria is supposed to be the best place.
It is a "peña de Flamenco" which is a private Flamenco club.
They have performances open to the public on Thursdays

Info here
https://laplateria.org.es/laplateria.html
The website does not appear to be very useful but try phoning 958 210650 to see what is on.
I doubt if they speak English.