One of Sendai's best attraction is its excellent accessibility. It is only 100 minutes by Shinkansen (bullet train) from Tokyo, and it serves as a gateway to all of Japan by air, rail, highway and ferry. Sendai also offers easy international access. The trip from Narita International Airport (airport code: NRT) to Sendai is only around 2.5 hours by Narita Express (a shuttle between the airport and Tokyo) and Shinkansen. From Osaka’s Kansai International Airport (airport code: KIX), a connecting flight to Sendai International Airport (airport code: SDJ) is only 1 hour and 20 minutes. Sendai’s international airport also serves 7 regular direct international routes which include Beijing, Shanghai and Seoul.

Tokyo-Sendai:

The easiest and the most popular transfer - taking JR-Narita-Express from the Narita Airport to Tokyo and JR-Tohoku-Shinkansen-Super-Express (Hayate or Yamabiko) from Tokyo to Sendai.
(You have an option to use the local train between Narita Airport and Tokyo)

The cheapest transfer - taking Keisei-Express-Skyliner from the Narita Airport to Ueno and JR-Tohoku-Shinkansen-Super-Express (Hayate or Yamabiko) from Ueno to Sendai.
(You have an option to use the local train between Narita Airport and Ueno)

Travel information - http://www.sentabi.jp/1000/0006/100000060000.html
Sendai International Airport - http://www.sdj-airport.com/english/index.html
Narita Express & Tohoku Shinkansen Timetable - http://jreast-shinkansen-reservation.eki-net.com/pc/english/common/timetable/index.html