Mt Fuji/Hakone one day tour

We have 4 days 3 nights stay in Japan and we would like to go with the tour, but if we are done by 6 pm ,can we still go back to Narita airport to catch up the last shuttle to Raddison hotel where we are booked ? Thanks in advance for all the answer and suggestion !

Where would you be by 6pm? Radisson Hotel Narita seems to be served by a JR highway bus from Tokyo station, check out their website or call for details. (their English website does not show the highway buses schedule). And the last one leaves Tokyo station past 10pm.

You should have no problems catching the last free shuttle bus around 22:00 if your tour ends in central Tokyo at 18:00.

As suggested by AK, there are also direct highway buses from Tokyo Station for 1420 yen one way to the hotel:
http://www.radissonnarita.jp/doc/TRANSPORTATION-20130201.pdf