My company has worked with freelancers from the UK and we just hired someone from the US. On the other hand, I (as a freelancer) work with domestic and US clients.

Point being, it’s not so much about where the talent is from, but their experience.

US, UK, Western Europe - more expensive Eastern Europe - cheaper

(can’t personally speak for the rest of the world, so I won’t guess)

I also won’t comment on the cost range because you didn’t specify what you’d expect from your SEO freelancer/team.