The domestic route connecting Bangkok and Krabi in Thailand and another connecting Roxas and Manila in the Philippines were named the cheapest in the region, with both offering fares of $8.
Ranking third was the Kota Bharu-Kuala Lumpur route in Malaysia with airfares starting from $9, followed by Seoul-Jeju and Mumbai-Goa routes.
The ranking was based on flight bookings made on Agoda in the first half of August for flights departing in September and October.
The route connecting Vietnam's capital and the beach city of Da Nang takes around one hour and 20 minutes.