about six hundred and forty days six months with the outbound flights a month on site and fifteen months home. to colonel to mars we need of course a rocket conventional chemical propulsion engines are pretty advanced the fuel is burned with oxygen to give maximum thrust this will enable us to fly to mars in six months. in what five. to chemical rocket propulsion projects are currently making advances nasa space launch system or enceladus is a deep space launch vehicle with several propulsion stages that could transport four people and fifty tons of payload to mars. the space x.