[QUOTE=Mile-Hor;9269560]
When I search BWI-DFW on 5/31-6/2, if I search by price, I get a lowest fare of $238, if I search by schedule I get a lowest fare of $332. That just doesn't seem right. Different fare classes show up for the same flights.[QUOTE]


I've found that if you choose the flights, the price usually comes down on the recap page.

Occasionally, depending on where and how you bail out of a booking, you sometimes hold a seat (perhaps the last seat in a fare class) for several hours causing subsequent searches to return higher fares.