"All the sudden everything just kind of went sideways and then next thing I know it's kind of a blink and I'm upside down still strapped in," he said.
He said he knew he needed to get out quickly in case a fire started, but that he and another man first helped free a mother and her young son.
Passengers onboard the Delta jet that crashed on a runway in Toronto, flipping over and leaving them dangling upside down, have been offered $30,000 (£23,800) each by the airline.
With investigations into the Toronto crash ongoing, Delta airlines confirmed to Sky News that passengers were being offered a cash lump sum.
Mr Koukov praised the flight attendants for a "pretty organised" evacuation and said "everyone got off in a pretty orderly fashion".
