England opened the tournament with a 3-0 win over Argentina in Group A, but the Boro duo would have to wait to make their first appearances.
Chapman's campaign began with a substitute appearance in the following game, a 1-1 draw with Guinea when he replaced Newcastle's Adam Armstrong with a little less than 10 minutes remaining.
Lewis Cook had given the Young Lions the lead in the game but Fikayo Tomori was unfortunate to concede an own goal just minutes later and the points were shared.
Fry stepped into the starting XI for England's next game against hosts Korea and the young defender played an important role in the 1-0 win as Paul Simpson's side were crowned Group A winners.
England then took on Costa Rica in the first knock-out game of the tournament. Fry started the game and Chapman was introduced on 84 minutes with England winning 2-0.
Costa Rica were able to pull on back on 89 minutes to make it a tense finish, but England held on to book their place in the quarter-finals.
Fry was back in the frame for the game against Mexico in what was arguably England's toughest test so far.
The Young Lions held firm though and Dom Solanke's goal just two minutes into the second half proved to be enough, despite a late onslaught from Mexico.
England would come from behind to beat Italy 3-1 in the semi-final before a tense 1-0 final victory against Venezuela - neither Boro man would feature but had played an important role for the Young Lions, who conceded just three goals all tournament.