As mentioned earlier, when you fly can also have a big affect on your BF fare. CO generally has sale BF r/t fares in the $1200- 2000 range during the winter holiday period. Some of these discounts have already been announced (and the fares snapped up), but they usually announce a second round in late Oct-early Nov....ie any day now. If you were to travel on one of those, it might be worthwhile to book the r/t and toss the return