Sendai Airport is located in Iwanuma City and Natori City approximately 20 km southeast of the central part of Sendai City.
You can take the Airport Limousine Bus from the airport to JR Sendai Station.
Also the Airport relay bus and trains services are available.Transfer from the relay bus to trains at Tatekoshi Station.
"SENDAI AIRPORT LINE" (Sendai Airport to Sendai Station via Natori Station) is due to be completed in 2007.
From the Taxi stand in front of Sendai Airport,it takes about 45 minutes and costs about 6500 yen. (From Sendai Airport to Aobayama Campus)
[Sendai Airport official page]
[Narita Airport official page]
You can transfer to a domestic flight to Sendai. It is also possible to take the Narita Express(JR) to JR Tokyo Station, or the Keisei Sky Liner to JR Ueno Station, and transfer to the Tohoku Shinkansen (Super Express) for JR Sendai Station.
[East Japan Railway Company ("JR-EAST") ]
Subway on Tozai Line (East-West line) are available from Sendai Station. Get off at Aobayama Stop, 5th stop from Sendai station. It takes about 10 minutes and costs 250 yen (130 yen) for an adult (a child) from Sendai station.
See here for details : https://www.kotsu.city.sendai.jp/english/index.html
From the Taxi stand at the JR Sendai Station West Exit (1F), it takes about 20 minutes and costs about 2000yen.