Below are the flight times and time differences between major overseas airports and Kansai International Airport/Narita International Airport (KIX/NRT).
Competition among carriers has recently cut the prices of airfares to Japan significantly, but fares increase during busy periods like the New Year, Golden Week (late April to early May), and summer holiday (middle of August) periods. We therefore recommend you make your travel plans well in advance and avoid these busy seasons to make the most of discount fares.
From North America to Japan, for instance, the recommended choice of carriers is ANA (All Nippon Airways) or JAL (Japan Air Lines), the two major airlines of Japan.
http://www.ana.co.jp/asw/AMCTopServlet?type=use
http://www.ar.jal.com/en/
http://www.anaskyweb.com/uk/e/
http://www.uk.jal.com/en/
http://www.anaskyweb.com/fr/f/
http://www.fr.jal.com/en/
http://www.anaskyweb.com/de/d/
http://www.de.jal.com/en/
http://www.anaskyweb.com/it/e/
http://www.it.jal.com/en/
http://www.anaskyweb.com/cn/c/
http://www.jal.com.hk/zhcn/
http://www.ana.co.jp/asw/wws/kr/k/
http://www.kr.jal.com/krl/ko/
http://www.ana.co.jp/asw/wws/hk/c/
http://www.hk.jal.com/hkl/zhhk/
http://www.tw.jal.com/twl/zhtw/
http://www.ana.co.jp/asw/wws/tw/ch/
http://www.anaskyweb.com/
http://www.jal.com/
http://www.kansai-airport.or.jp/en/index.asp