Rangers remain bottom of the table and five points from safety but have been boosted by taking four points from their last two league matches against Chelsea and Tottenham.
Onuoha, 26, is confident after enjoying a run in the first team since Harry Redknapp took over as manager.
"The manager said before the game that if you keep winning it is a good feeling to have and you go into the next game always thinking about the previous one," he told QPR Player.
"We have to believe we can get something out of every game we play between now and the end of the season otherwise we will have no chance at all.
"We are in good form which makes a difference because we haven't been in good form at all this year so hopefully things will go our way.
"The way that it works when you are bottom of the league is that you have a different perspective on football and the situation you are in," he said.
"We knew it could only get better but we have to keep working hard otherwise it'll just stay the same. You have to be single-minded and do the right things to stay up. We have to win, just do whatever we have to do to win the game."