Using Skyteam partners http://www.kayak.com/r/DoECCRQXqi EDIT: See this link for current prices http://www.kayak.com/flights/CHI-IST/2012-11-20-flexible/2012-11-28-flexible It's 2.34 4.75 CPM on KLM metal, though that assumes 100% earning. Unfortunately, I don't know enough to find out if I earn 100% Delta points on KLM. Cost is $529 AI at the low end. Any advice for a n00b is much appreciated! EDIT: Prices have gone up by $1. EDIT 2: Due to a mistake using MileCalc's calculator, the actual CPM is 4.75. Lesson learned.