This varies by program and routing. And cheapest isn't an easy thing to say. Some points in programs are "worth" more. 100,000 US miles doesn't mean it's equal to 100,000 AS miles or 100,000 MR points. Also some airlines charge different fees (fuel surcharges) and taxes by route and stay overs.
Read up on the rules of the programs you have miles in, can transfer to and/or can get a signup bonus for.
Originally Posted by
rb23lb
How many points in coach from lax to the Maldives? What is the cheapest way?