A sightseeing helicopter on Fiji's Treasure Island was caught by a sudden gust of wind upon landing on Wednesday, sending its churning blades within metres of tourists and crashing to the ground.

No-one among seven aboard the Island Hoppers Eurocopter AS350 was hurt. Two elderly Australians, a New Zealand family of four and its New Zealander pilot walked away from the crash.

Chinese tourist Yang Yang was filming the chopper just metres from the landing pad when a strong gust of wind caught the aircraft, sending it directly toward him and other tourists.

TV New Zealand employee Emily-Jane Thompson said her brother and his family, including two children under ten, were aboard the helicopter.

"Flippin' Christmas miracle right here ... my brother, his beautiful wife and daughters all safe after this horrific ordeal," she posted to Facebook.

Fiji's Civil Aviation Authority has opened an investigation into the crash, Fiji Broadcasting Corporation reported.