Kayak also has a feature that is worthwhile. They call it their Flexible Date Search. It allows a user to explore a map of the world and it shows airfare to various destinations. You have the ability to enter a budget and it allows the user to look at different months. The problem with the Kayak screen is that it only shows deals that Kayak users have found in recent searches. While this is a good benchmarking tool, it doesn't assure that the prices are currently available. This implies that locations which are not heavily traveled will not show up as much on a search. Kayak is, however, another good option in your toolbox of airfare searches.
Another place I go is Travelocity. They have a Flexible Date
option that allows me to see the best airfare deals for an extended period of
time. In the first screenshot you see a picture of the Travelocity web site and
I'm booking airfare from OKC to London, England. I chose Flexible Dates and it
is giving me the option from today through October.
On the next screen shot I have the results and they are good.
I can find some very good airfare deals this way. The problem with Travelocity is
that many of the deals listed on the screenshot will not be available when I
select them. They have been sold out. Often, many of the others have a very,
very limited selection of dates that are available. This means a lot of
iterative searching and time consumption. It can, however, produce some very
good airfare bargains.
British Airways has a nice little feature at their web site that will help you benchmark airfares to Europe. You start off by going to the cheap flights section of their web site. Pick a city of departure. The default destination is London. It's British Airways, after all. Click on Show All Months and you will be presented with a graphical display of the lowest fares by month. Once you have arrived at the graphical display, you can change your city of origin and your city of arrival. Note that BA does not fly from everywhere. Note that not all cities of arrival are available for graphical display. The lowest fares that will be on display will be the major market routes.