Inauguration ceremonies were held at Mactan-Cebu International Airport and Clark International Airport, where the first Vietjet flights were welcomed with traditional water cannon salutes.
The new services include HCM City-Cebu, Hanoi-Cebu and HCM City-Clark, complementing Vietjet's existing HCM City-Manila route.
The additional routes strengthen connections between Vietnam and major economic and tourism centres in the Philippines.
Cebu is known for its beaches, diving sites and cultural attractions, while Clark, a growing economic and urban centre north of Manila, provides access to destinations across Central and Northern Luzon, the Philippines' largest island.
Vietjet is currently the only airline operating direct flights between HCM City and Clark International Airport.
The new services also offer Philippine travellers more options to visit Vietnam, known for its cultural heritage, cuisine and vibrant cities.
Through Vietjet's network from HCM City and Hanoi, passengers can connect to other destinations in Vietnam and international routes serving Australia, the Czech Republic, Kazakhstan, India, Japan, South Korea and China.
Athanasios Titonis, CEO of Aboitiz InfraCapital Cebu Airport Corporation, which operates Mactan-Cebu International Airport, said the two new routes would offer Cebu residents more travel options to Vietnam while giving Vietnamese tourists direct access to Cebu and nearby islands.
According to Vietjet Chief Executive Officer Nguyen Thanh Son, the new direct services to Cebu and Clark demonstrated the airline's long-term commitment to the Philippine market.
He said the routes would facilitate travel, strengthen tourism and trade cooperation, and promote exchanges between the two countries.
To mark the launches, Vietjet is offering promotional Eco fares starting from VND 0, excluding taxes and fees, and a 25 per cent discount on Deluxe fares for international routes from November 10 to 12.
Further details are available on the airline's website, www.vietjetair.com, and its mobile application.
Vietjet said its expanding international network would provide more travel options and strengthen connections between destinations and communities across the region.