Onsen Monogatari to Airport Transportation?

Hello! My friend and I will be visiting Tokyo and want to go to the Oedo-Onsen Monogatari as our last excursion before heading to Narita for our flight. What would be the best/easiest route to get to the airport from the onsen?

For comfort, I would consider a bus from one of the hotels in Odaiba, such as the Hotel Nikko Tokyo or the Grand Pacific Le Daiba:
http://www.limousinebus.co.jp/en/bus_services/narita/takeshiba_odaiba....

It is not the cheapest option, though.

What time is flight check in limit?

What would be the best/easiest route to get to the airport from the onsen?

You may consider their free shuttle to Shinagawa station , and NEX to Narita Airport, especially if you have JR PASS.

Ohh free shuttle I like the sound of that! haha Our flight isn't until early the next morning so we're gonna stay in the capsule hotel in Narita that night, so time isn't too big of an issue, as long as we make it before check in time (9:30 pm). We don't have a JR pass (planning on getting a PASMO or something) but maybe we should get one?

Also what would be the cheapest option?

The cheapest is to take the free shuttle bus to Tokyo Station (infrequent, check schedule) and then a discount bus to the airport (900 yen):
http://www.ooedoonsen.jp/daiba/access.html
http://www.japan-guide.com/e/e2027.html

This is great info! Thanks! now we have a few options for what we want to do! :)

The 900 yen is only applicable if you make an online reservation in Japanese:
https://secure.j-bus.co.jp/ks/Result.mvc
or
http://travel.rakuten.co.jp/bus/agt/shouhin_1101.html#1579

Otherwise, it will cost 1000 yen.