Here is a site I use almost weekly. You simply type in where you want to travel from and to. In your case, you will need to click in the space where you've typed the city after you've pressed enter, to select from a drop-down menu of specific airports within that city. However, once you've done this, you'll have a list of all airlines that fly between those cities and the journey time is reflected in either the direct flight or connecting flights.
There's a bit of irony in the fact that I've had flights between Washington and New York or Boston and New York that took as long as a flight from L.A. to New York! Of course, most of the time was sitting on the aeroplane on a ramp somewhere listening to announcements about air traffic delays!
http://travel.airwise.com/schedules/index.html
Be well
Fr Bill