$247.60 for BOTH of you is a a GREAT deal if that's the round trip price for both tickets.
Flying out of PVD is a SNAP. Literally. It takes a bit longer to get checked in because of how their checked baggage is screened, but no big deal really.
SWA is slightly different since you don't get to choose your seats ahead of time. You may checkin online 24 hours prior to your flight. The letter of your boarding pass determines when you board. A passes say you can pretty much choose whatever seats you'd like. B passes mean you'll probably sit together, but may be towards the rear of the aircraft. C passes mean you'll probably have to split up.