Want to find the lowest fare for your trip? Compare airfares at:
Travelocity-Best Fare Finder
Select a departure city, and Travelocity will show you the lowest fares available to a wide variety of destinations. Once you select a destination, a calendar shows you when the fare is offered.
Expedia Flight Wizard
Look under "Flexible Travel Dates" to find out when the lowest published fares are available.