Mt Fuji to Narita Airport

Can anybody advise what is the shortest and cheapest way to travel from Mt Fuji to Narita airport? I am checking out on 12Nov and flight is 12th Nov, 7pm from Narita. Enough time? How much? Thank you.

Depends where around Mount Fuji you will be starting from. Kawaguchiko? Hakone? Gotemba? Fuji City? Fujinomiya?

Hi, I am intending to stay at K's House at Mt Fuji. K's House Mt.Fuji is located in Fujikawaguchiko town which is base for Mt.Fuji. Whao, I really do not know there are so many other towns in Mt Fuji. I am so lost. Please advise. Thank you.

You have a few alternatives, but all of them lead via Tokyo.

How to travel between Kawaguchiko and Tokyo:
http://www.japan-guide.com/e/e6905.html

How to travel between Tokyo and Narita Airport:
http://www.japan-guide.com/e/e2027.html

If your flight is at 7pm, I recommend to leave Kawaguchiko Station by noon.

Thank you. Can you advise if my plan is visible? Narita to Ueno to Mt Fuji to Ueno to Narita?
Since going to Narita must pass Tokyo, then I go back Tokyo stay another night before leaving. Is it possible? Sorry, because I am planning for my first Free and Easy trip to Japan. Thanks!

I see no problem with your plan.

How to get to Kawaguchiko from Shinjuku (including the location info of the bus depot in Shinjuku.):
http://tinyurl.com/5jylgs

How to change trains between Keisei and JR Yamanote Lines at Nippori:
http://tinyurl.com/45j9zz

Keisei Line info:
http://tinyurl.com/6nwxm7

Thank you. All of you are so helpful. May I know if we need to be full naked to go to onsen at Mt Fuji? Can we wear swimming costume into onsen?

Full naked! No swimming costumes. But genders are separated.