I have found a fare for $500 for an open jaw ticket from chicago o’hare to london heathrow on 9/5, returning from madrid barajas to chicago ohare on 12/5. i realize this is probably as good a deal as i am going to find. however, i am still somewhat unsure of an intinerary and schedule for my trip. so, will this kind of price still be available after i do some more research and planning? or do i just buy now and plan accordingly?