I also very much enjoy kayak.com, especially since they are checking the actual airline websites and then take you there to book the flight. It is true, however, that it isn't always accurate. Often times the lowest fare isn't actually available once you get to the airline website, although sometimes the opposite happens. While looking for flights for a trip I'm taking in August to the DC/Baltimore area, F9
and return showed up as over $500 on Kayak, slightly more than the ticket cost on either NW
. Before booking with UA
, I decided to just check Frontier's website on a whim, and found that they had flights available for only $300 round trip that did not show up on Kayak! So, while Kayak or any of the other websites like it are certainly nice to get an idea of what you will be paying, it's not a very good idea to trust them completely, as it saved me $200 to check the airline website anyway.
Oh, and if there were a "secret" website out there with lower fares than everywhere else, it wouldn't remain a secret for very long!
[Edited 2007-06-23 04:29:40]