A quick look on Travelocity shows SEA-MCO at $265 RT on TWA with 7 days advance purchase, and travel through Dec. 14. In all likelihood, MCO-SEA won't go back to $198 until after Labor Day-- I'd say the 2nd week of Sept. at the earliest. So if you have to travel in Aug. or Sept. you might do best taking this-- but for Oct. or later, you can probably gamble on the next sale.