In air travel, a good deal is the best deal you can get for the dates you need to fly. You can't do it relative to any other date, as it's not like buying sheets, when they are on sale every January and you can expect it.

If it's possible you may want to consider all the NY airports and Philly, it could save you some bucks if money is the driving factor.

Subscribe to the watch sites like farecompare and airfarewatchdog so you can jump on the specials when they become available.