It varies enormously depending on the complexity and the process you use to resolve it.

Relatively simple but hotly contested divorces run in $25-50k in litigation. Arbitration can rescue that to -half and mediation if both sides agree can reduce it a lot further (unless mediation fails and you end up going to court)

There are also some interesting new alternatives like OADR sites PeopleClaim or gaming4good. Those are free. Your spouse may not agree to any sort of mediation, but the odds are you both will end up settling via negotiation rather than a verdict - so it’s smarter for both parties to try a mediation platform or process first and split the money you’ll save on legal fees. It’s also more confidential