Just thought I would throw this out there because I came across it today...

SW.com sent me an email advertising $99 one-way fares from BWI to DAL, so I hopped on SW.com to see if it was during the time I planned on traveling in the Summer so I could book my friends tickets (as I am flying out of DTW), which is odd anyways because my home SW.com airport is set for DTW but I get fare emails for BWI... But, it turns out $99 is not the cheapest fare offered, it was just what the email said...fares are currently as low as $59 one-way. I'm not sure who they are competing against, but this was for several days and times each day, including other fares for $63 all the way up to $200 one-way.

With this, is there any way to catch these kinda deals when they do it? I would love to find a $100 round trip deal for a weekend trip (mind you the dates I checked were still over three months out). One other time I found a $49 one-way weekend fare for DTW to BWI, but it was about two weeks out when I saw it and I have yet to ever see it again.