Hong Kong (HKG) to Sanya (SYX): 402 miles (647 km) great-circle, about 1h 20m nonstop by our estimate. Cheapest fare observed: $148 round-trip on HK Express, nonstop, departing July 2, 2026.
$148 round-trip, HK Express UO250, departing 2026-07-02 at 18:45, returning 2026-07-16. The recorded itinerary left on a Thursday, returning on a Thursday 14 nights later; the fare was observed 68 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $148, it was the cheapest of the 30 round-trip fares we recorded from HKG (median $303). That is 36.8 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: Hanoi (526 mi) at $213 and Da Nang (571 mi) at $240.
HK Express had the cheapest fare on 10 of 30 HKG routes. It is the 30th longest of the 30 routes we track from HKG.
Of 5 departure airports with a fare to Sanya, Hong Kong (HKG) ranked 1st at $148. Lowest: $148 from Hong Kong (HKG); highest: $472 from Taipei (TPE); 4 nonstop. Cheapest-fare airlines (routes): 9 Air (1), airline Y8 (1), China Eastern (1), Hainan Airlines (1) and HK Express (1).
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones Asia/Hong_Kong, Asia/Shanghai; flight time is our estimate.