Year-end and Lunar New Year fares rarely drop — they mostly rise — so book as early as you can, ideally 2–3 months ahead.
- Direct flights on weekdays (Tuesday, Wednesday) are usually cheaper than weekends.
- Avoid peak dates: 23–24 Dec, 30–31 Dec and right before Tet; flying 2–3 days earlier or later saves a lot.
- Compare on Google Flights and Skyscanner, then book directly with the airline if the difference is small.
- Low-cost carriers: add baggage and seat fees before comparing prices.
- Set price alerts for the routes you want.
Note: if you need a visa, book refundable or changeable fares, or hold a reservation until your visa comes through.