Dear FTers

I wish to travel in July 2015 on the following itinerary:

DOH - MIA (stopover) - SCL (stopover) - MIA (stopover) - DOH

Normally we book in Y/Y+ for daytime flights and C/J for night flights (also sometimes try to miles for upgrade) but understand that this may not be possible in a mixed metal trip.

Appreciate any guidance on OW fare options which are more cost efficient than booking a regular fare with a carrier.

DD