Hong Kong (HKG) to Hanoi (HAN): 526 miles (846 km) great-circle, about 1h 35m nonstop by our estimate. Cheapest fare observed: $213 round-trip on HK Express, nonstop, departing June 9, 2026.
$213 round-trip, HK Express UO540, departing 2026-06-09 at 07:40, returning 2026-06-14. The recorded itinerary left on a Tuesday, returning on a Sunday 5 nights later; the fare was observed 45 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $213, it ranked 5th of the 30 round-trip fares we recorded from HKG (median $303). That is 40.5 cents per great-circle mile (round-trip price over one-way distance), above the HKG median of 22.1 cents across 30 round-trip routes.
Routes from HKG of similar length: Da Nang (571 mi) at $240 and Sanya (402 mi) at $148.
HK Express had the cheapest fare on 10 of 30 HKG routes. It is the 29th longest of the 30 routes we track from HKG.
Of 9 departure airports with a fare to Hanoi, Hong Kong (HKG) ranked 3rd at $213. Lowest: $170 from Bangkok (BKK); highest: $523 from Sydney (SYD); 4 nonstop. Cheapest-fare airlines (routes): Vietravel Airlines (2), China Eastern (1), HK Express (1), IndiGo (1), Korean Air (1) and Shenzhen Airlines (1), plus 2 more.
The reverse, Hanoi (HAN) to Hong Kong (HKG), was $212 round-trip on HK Express, nonstop, departing May 21, 2026. Hanoi to Hong Kong flights.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones Asia/Hong_Kong, Asia/Ho_Chi_Minh; flight time is our estimate.