This operator can help select your international flights, but you'll have to book them yourself help
Fly to/from Abeid Amani Karume Airport (ZNZ - Check price) on Zanzibar. Or fly to/from Dar es Salaam (DAR - Check price) . There are daily ferries between Dar es Salaam and Zanzibar.
A transfer from and back to the airport can be arranged for an extra cost
Additional accommodation before and at the end of the tour can be arranged for an extra cost
I have booked my second safari with Serengetiafricantours and can only encourage whoever wants to discover the Serengeti to use their services. The program was impeccable & have some special call out with Safina who has handled my 2 trips...