Transport from Montgomery Co PA to Newark Airport

If it were me, I'd definitely do SEPTA to 30th Street and Amtrak straight to Newark from there. Less hassle, more reliability, fewer transfers.

You don't say when your flight out of Newark is, but just in case it's on or before July 15, keep in mind that http://www.panynj.gov/airports/ewr-airtrain-suspension.html. If you want to do the Amtrak route, the Port Authority is running buses from Newark Penn Station. http://www.amtrak.com/servlet/Satellite?pagename=am/AM_Alert_C/Alerts_Popup&cid=1251625915531 on how to get to the airport while the station and AirTrain are closed.

I would agree with the Septa to 30th and transferring to Newark from there. Depending on where you are in Montgomery County and the timing, there are Amtrak trains that stop in both Ardmore and Newark; this might be more expensive though than going to Philly first. I just did a round of Septa (Norristown)/Amtrak (using points)/LIRR/JFK airtrain and while it wasn't terrible, it took a lot of time and we were lucky there were no breakdowns or signal problems on any transit systems. I have also taken Septa many times from Trenton to Ardmore and even if the trains are close together, it usually took close to an hour and a half just for the trains.

I wouldn't even bother with SEPTA; I'd just get on Amtrak at Ardmore or Paoli depending on where you are in Montco and take it right to EWR. I've taken SEPTA from downtown Philly to Trenton and then NJT to EWR, and it was a nightmare (I was also carrying ~100 lbs of equipment alone, so ymmv, but it still sucked). Taking Amtrak the whole way would be so great: get in, grab a seat, find a better one once folks depart at 30th St, and just relax the whole way. Shuttles are terrible and cramped and take forever. Don't do it.

I'd recommend hopping on Amtrak and taking it straight from Philly to EWR. I'm not sure how far Montgomery County PA is from Philly; perhaps you can hire a car service, get a friend, neighbor, or family member to drive you, or take a taxi to the train station. Amtrak seems the most hassle-free option. I'm not sure how much luggage you will have, but there is floor space at either the front or back (I forget which) of each train car for luggage.

the Port Authority is running buses from Newark Penn Station They take at least twice as long as the AirTrain, and you still have to pay the AirTrain fee. You might want to consider finding an alternate route between Newark Penn Station and the airport.

They take at least twice as long as the AirTrain, and you still have to pay the AirTrain fee. I haven't taken it myself so I can't be sure, but the Amtrak page I linked to does say that "shuttle service will be free of charge to passengers who present the bus driver with a ticket/travel document designating travel to Newark Liberty International Airport (EWR)." I know this seems to contradict the Port Authority's site that says that normal fares will be charged for the bus service, but I think that's for people who arrive by New Jersey Transit maybe?

Thanks everyone for the feedback. Both my departing and arriving flights are before the 15th, so the closures (which i hadn't seen when I searched a few weeks ago) are definitely important - thanks for the info @andrewesque ! More details: I live in Ambler PA and am very near a RR stop so its easy enough (though sometimes adds time) to take the RR to the city or other transfer spot. My flight is at 6pm and its international so I'm aiming to be there by 3:30. For my return flight, I land around 2:00pm. Because I depart and arrive during work hours I'm not asking friends or my fiance for rides. Right now I'm thinking either RR to 30th street for Amtrak or taking the Transbridge to Newark. @bergeycm - have you taken this bus before? I have never even heard of it but its an appealing option for the timing and as it looks like it departs from Doylestown station.