Vietjet Air is set to begin flying the Hanoi - Nha Trang route from May 24.
The new route is the carrier's third, in addition to the Hanoi – Ho Chi Minh City and Ho Chi Minh City - Da Nang routes.
Another carrier, Air Mekong officially opened a direct air route between Ha Noi and Con Dao May 20, with nine flights a week.
The new route is expected to meet increasing demand of tourists from northern localities to travel to the historical, southern island during the summer, the airline said.