The Flyweight class in the boxing competition was the second-lowest weight class. Flyweights were limited to those boxers weighing a maximum of 51 kilograms (112.4 lbs). 26 boxers qualified for this category. Like all Olympic boxing events, the competition was a straight single-elimination tournament. Both semifinal losers were awarded bronze medals, so no boxers competed again after their first loss. Bouts consisted of six rounds each. Five judges scored each bout.[1]
| Date | Round | ||
|---|---|---|---|
| Monday, October 14, 1968 | First round | ||
| Thursday, October 17, 1968 | Second round | ||
| Monday, October 21, 1968 | Quarterfinals | ||
| Thursday, October 24, 1968 | Semifinals | ||
| style=background:lemonchiffon | Saturday, October 26, 1968 | style=background:lemonchiffon | Final Bout |
1 Cintrón was ejected from the competition after officials discovered he was underage on the morning of the first round.[2]