One way coach award tix start at 5000 miles each way, and some have been spotted at 7500, and 10,000, but you hafto book in advance and hunt a little.

I'm flying next week SEA/SFO for 5000 miles. It was 7500 when I booked it, but it went down to 5000, so, I rebooked it at the lower rate!

Good luck to 'ya!