There would be two to three weekly flights on each of the routes, Kazinform news agency reported.
Flights were suspended in March 2020 soon after the Covid-19 pandemic began.
Cam Ranh, around 45 kilometers from Nha Trang, is famous for its white sandy beaches and high-end resorts.
Vietnam has been allowing quarantine-free entry since March 15 and also scrapped Covid testing requirements.