This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $150 fare is the cheapest current round-trip from Hanoi (HAN) to BKK on FD flight FD645, departing 2026-08-12 at 20:55 with return on 2026-08-13.

Clicking "Book this flight" opens Kiwi.com with this exact flight pre-filtered — same airline, same dates, same passenger count.