Public transportation from Ben Gurion Airport:  The 3-level bridge on level 2,  next to gates 21  23, is for public transportation.
The trains station is in Terminal 3, at its S level, next to 'Greeters Hall'.

By Bus:
'Superbus' serves Shoham & Modi'in from Terminal 3, level 2 - tel. 1-700-700-181 or open its service cente at: superbus.co.il
'Metropoline' serves Be'er Sheva,  departing from Terminal 3, level 2.  Tel. *5900 or open: metroline.com
Egged service line buses start at El-Al Junction on Road 40 (5 km outside of the Airport) & serve some Israeli cities with its lines 244, 249, 423, 930, 943, 747 & 950.
- The free Airport Bus Line 5
stops outside of Terminal 3, level 2, and connects to the Egged bus terminal.
To contact Egged Customer Service Call Center dial 03-6948888 or *2800 - or visit : egged.co.il

By Train:
Train service to the Tel Aviv Savidor Central Railway Station is available to/from the airport from lower level (S) of Terminal 3 , an 18-minute trip, connecting to other parts of the country, while shared taxi van, known as 'sheruts', can take you to Beer Sheva, Haifa and Jerusalem.
If arriving at the Airport by train and needing to get to domestic Terminal 1, use the internal shuttle service between T3 & T1 - which stops at the ground (G) level of T3, close to gate 01 (after exit to the right) - but tell bus driver to take you to Terminal 1.

Google Plus One