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We are big fans of travel booking sites that offer a flexible date search capability. Many of the fares we list, because they are so low, have limited seat availability so you'll save yourself time by using a flexible date search. The two best flexible searches are Travelocity and CheapAir.
To use Travelocity enter the cities in the "to" and "from" boxes; make sure the flexible dates option is selected and click on "search flights." Click on "select" to see a calendar of dates when the fare is available and on "fare rules" to see restrictions and other information.
OW=One Way; RT=Round trip; and OW for 1/2 RT fare means you can buy this fare one-way only and pay half the RT priced listed