This flight price is available for many different days in August. Some specific dates are August 12 - August 24 , and August 18 - August 29.
Cheap Flights from New York City to US Cities
Fare requires a 10-day advance purchase. Travel must be completed by June 17, 2009. Travel must take place on Tuesday and/or Wednesday.
Their website is saying that flights are as low as $109 each, but I haven’t found any flights this cheap. I have found roundtrip flights for $239 on a variety of days.
JetBlue is offering flights between JFK and Dulles Airport (outside Washington DC) for $44 each way.