NSW Police said the driver of the car, 22-year-old Nepalese national Fagar Bhattarai, was stopped at the airport on Friday night while trying to leave the country and charged with multiple offences.

Five people were travelling in the vehicle when it left the road and rolled near Rose Valley Road, Bunyan, about 3:40am on Sunday, July 28.

A 21-year-old male and a 22-year-old female died at the scene.

Police described the scene as "horrendous" and said it was surprising the three survivors had not been more seriously injured.

Two of the passengers, aged 19 and 20, suffered superficial head lacerations.

Mr Bhattarai also suffered a serious head laceration and was flown to Canberra Hospital with one of the other injured passengers for treatment.

He was arrested at Sydney Airport following a week-long investigation and taken to Mascot Police Station where he was charged with two counts of dangerous driving occasioning death, among other offences.

He was refused bail and will appear in Parramatta Court today.

Ramro yeslai jail halnu parcha. 22 ko age ma crazy stuff garchan manche le Tara as a driver, usko haat ma 4 Jana aru ko pani responsibility thiyo. Afu eklai bhako Bela chalayera swargabas bhako bha Kai farak pardaina thyo. But yesko negligence le duita young manche le jyaan gumaye.

So, always drive responsibly , no DUI, no texting. Also drive defensively. Don't wanna be a victim of these idiots.