How passengers can an Airbus A340 accommodate?

It would depend on the individual airline, and how they specify the interior. The series 600 has a stretched fuselage, which increases the number of passengers. However, as a rule of thumb, think about 350.

Airbus A340-300 has 295 seats

Airbus A340-500 has 313 seats

Airbus A340-600 has 380 seats

Read more: How_many_seats_does_an_Airbus_A340_have