Join Date: Jun 2001
Location: The road less traveled
Programs: UA Gold MM, AA EXP, Delta Platinum, Marriott Titanium, HHonors Diamond, Natl EE, Hertz Platinum
Posts: 5,189
The same service is provided by Travelocity right from their homepage. (In fact, I think Yahoo! Travel is power by Travelocity...)
Just go to Travelocity.com enter your departure and arrival cities, be certain the "My dates are flexible" option is selected, and click Go. It will show you all applicable fares between those cities. And using tfjim's mouse-rollover method you can see the fare basis codes.
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"What do you mean you didn't get miles for that?!"