While the bonuses require travel by Sept. 30, I did look to see how long you can stretch out your travel date to get the low fares. Most of them expire in the fall, but for some reason the Spain fares are good for departure through March 31. That's the Wednesday night before Easter, so if you're look for a spring break idea, this may work. I got the $237 all in fare from JFK into MAD and out of BCN for those dates.
No 25,000 mile bonus, but still a great fare.
EDIT: It seems like only JFK-Spain works into March for the $200s. I tried some of the other sale cities to Spain and no luck. Sorry. So that route is like a sale within a sale.
Maybe someone can find another city pair like this one.