The most budget-friendly way to fly from 205 Pham Ngu Lao, bus to Vung Tau is to grab a ticket during one of the major seat sales which different airlines run quite frequently. To do that, you must plan your journey well in advance.
Besides the route and the airline, the price of your ticket will depend on the class of the seat, as well as on the season you fly, the day of the week, the time of the day, the extras included in your rate – meals, checked-in luggage, etc.
The lowest standard fare for this route is USD 73.60 offered by Bamboo Airways. If you are ready to shell out USD 81.06, you can fly with Vietnam Airlines (เวียดนาม แิอร์ไลน์).