How much is it to fly to japan?

Question:

i have 800 dollars saved now and i like to how more money in need to go there?

Answer:

You don't say from where, or when - so how can anybody answer such a question?

It depends on the kind of ticket that you buy, when you fly, which airline(s), etc. If you are in Podunk and have to connect in a big city for the international flight, that will cost you more. If you fly in the summer or start/end of the year, that will cost more too.
Most likely you will need at least US$1000. It looks like many airlines will not change their insane fuel surcharges for the rest of the year either.
Just remember the fine print for those cheap-o airline tickets - you may have no refund value if you have to cancel, and/or high charges or no ability to make a date change if needed.
You can try kayak.com or mobissimo.com for some lower fares, and some airlines have specials directly through their websites.
The rest is up to what you want to do, and your standards. Where will you go and what will you do?
If you want to travel, then a JR Pass might well be worth it - see www.japanrailpass.net -; or look into an airpass like www.jal.co.jp/yokosojapan/ or
http://www.staralliance.com/en/fares/reg…
or
http://www.ana.co.jp/wws/us/e/wws_common…

You don't need tons of money for hotels either...there are discount places to stay, such as the Superhotel chain or Toyoko Inn and others, see:
www.toyoko-inn.com/eng/
www.superhoteljapan.com/en/
http://www.kid97.co.jp/~jeh-group/jeh-gr…
or even cheaper places like
www.newkoyo.com
www.juyoh.co.jp
www.hotel-toyo.jp
www.shrek-watta-house.com
www.khaosan-tokyo.com/en/original/
You can also get a day pass for the city subways for about 1000 yen or USD$13 or so, and for food you can easily eat at some less expensive places for about 3000 yen a day or less. If you want to go all over the Tokyo area then a JR East Rail Pass might be a good idea.
Souvenirs can be a couple of bucks to anything higher, whatever you want to spend.
And a good website to look at is
Tokyo Price Guide at www.tokyopriceguide.com
So you need to save more, but you don't need to sell your soul as some proclaim.