When I consider probability of crowdedness, N'EX sounds good to me, at least better than Airport Narita (Rapid until reaching Tokyo) which costs longer time and has fewer trains.
13 - 17 July are weekdays with evening rush hours, and 20 July is a national holiday; I guess children's summer vacation will begin on 18 July as to many schools around Tokyo. JR-East and another company have stations of the same name in each of the two terminal buildings of the airport.
Check which terminal your flight is going to use.
As to N'EX:
Seats of N'EX trains require reservation and they are all non-smoking seats.
Tickets are available at a JR East Travel Service Center.
If the Center is already closed, find a ticket office (called "Midori-no-madoguchi") near the Center.
- JR East Travel Service Center
http://www.jreast.co.jp/e/travel_info/service_center/in...
A N'EX train may have two parts into which it is divided at Tokyo Sta. for different directions.
Your car of N'EX will be destined to Ofuna, not to Omiya, Ikebukuro or Takao.
As to JR fares and charges:
If your little child solely utilizes one N'EX seat, purchase kids' rate tickets separately for him/her (Fare: 940 yen, Charge: 1,140 or 1,240 yen).
Children under 1 are regarded as babies, and children of 1 - 6 in age who were born on 2 April 2003 or later are regarded as infants until 31 March 2010.
One or two babies or infants accompanied by one adult are free from JR fares and charges except when a baby or an infant solely utilizes one reservation seat or bed.
As to Suica & N'EX package for adults:
To an adult holding a foreign nationality, Suica & N'EX package is available at 3,500 yen
(1,500 yen for N'EX, 500 yen for deposit on the Suica card and 1,500 yen for Suica e-money).
If you find a KIOSK or a convenience store NEWDAYS open in the airport or in Yokohama Sta.,
maybe you can buy something for your children with the Suica card using e-money.
Of course it's OK to leave the Suica card until your next trip in the near future.
- Suica & N'EX
http://www.jreast.co.jp/e/suica-nex/index.html
Timetables:
- Narita Express 44
18:48 : Narita Airport
18:52 : Airport Terminal 2
20:23 : Yokohama
- Narita Express 48
19:45 : Narita Airport
19:49 : Airport Terminal 2
21:24 : Yokohama
- Narita Express 50
20:44 : Narita Airport
20:46 : Airport Terminal 2
22:19 : Yokohama
//
