This is lifted from a Providers website but makes the point:
New York City (& U.S. Cities) - Prices in USD 
Incall Outcall
1 hr 500 N/A
1.5 hrs 700 N/A
2 hrs 900 1000
3 hrs 1300 1400
Dinner - 4 hrs N/A 1800
Doubles - 2 hrs N/A 1100
9 hrs (10pm - 7am) N/A 3000
12 hrs (9pm-8am) N/A 4000


Paris & Rest of Europe - Prices in Euros 
Incall Outcall
1 hr 400 400
1.5 hrs 500 500
Each additional hr 250 250
Dinner - 4 hrs N/A 1000
Nuit Complet - 8 hrs N/A 1500
Breakfast in Bed Overnight - 12 hrs N/A 2000


London - Prices in GBP 

Incall Outcall
1 hr 300 350
1.5 hrs 400 450
2 hrs 500 550
Each additional hr 200 200
Dinner - 4 hrs N/A 800
Luxury Overnight - 12 hrs