do you really have to go to LGA? the trip from New Haven could be as long as your flight- or worse- if you try to drive and the traffic is blocked for HOURS (especially on a sunday afternoon coming down from New England)

US flies HVN/PHL up to six times a day- make a connection in PHL and you may be at your destination faster than via LGA- which is also notorious for ground delays

(we're number 47 for takeoff so we're shutting down the engines for 90 minutes or so......")