The Ivorian, who is set to depart for the Africa Cup of Nations with Ivory Coast following the New Year's Day fixture, came off the bench to net the leveller at the end of a match in which Swansea rarely threatened.
Leroy Fer gave QPR the lead with a thunderous strike in the 20th minute after Rob Green had escaped punishment for a handball outside the penalty area.
The visitors had Wayne Routledge controversially sent off for his reaction to a heavy Karl Henry challenge in the closing stages, but there was still time for Bony - a 71st-minute replacement for Gylfi Sigurdsson - to have the final word.
Swansea's record signing received the ball in the box from Ki Sung-yueng - also jetting off to the Asian Cup after the match - and turned before firing beyond Green in the QPR goal to snatch a point.
Despite throwing away the lead, QPR are now unbeaten in six matches on home soil, while Swansea will be thankful to have escaped with a point.
Monk's men were less fortunate after their next defensive lapse, though.
Federico Fernandez's headed clearance fell at the feet of Fer, who took two touches before rifling in an unstoppable effort from 20 yards.
Swansea's last visit to Loftus Road produced a 5-0 victory on the opening day of the 2012-13 season, but the Welsh club struggled to find a way past this term's most porous defence on Thursday.
Fernandez and Sigurdsson both saw efforts go just wide, before Monk decided to bring Bony – heavily linked with a move away from the Liberty Stadium this week – on for the last 20 minutes.
Routledge's red card four minutes from the 90 looked to have boosted QPR's chances of holding out for maximum points, but Bony fired home two minutes into stoppage time to earn his side a point.
