Originally Posted by
Anglo Large Clawed Otter
My guess is, that if this is redeemable with CO miles, then it will be in the same range as U.S. ----> Northern S. America. A Series 5 is 35,000 miles, whereas a Series 5b (Delta Award) is 45,000mi. The interactive reward chart specifically lists French Guiana as one of the Northern S. America countries, so perhaps they took this routing into account already.
Don't forget that you get a free stopover on a reward, so you can actually do two of the cities on the Carib run on a single ticket. With a bit of planning you could probably do a pretty entertaining routing with connections from FDF west and then looping back through to go south before heading back to MIA, where we'd connect back onto CO for our flights home.
CO.com can't search the route. Shocking.