===
World Aquatics Championships=== ====
2013 4th FINA World Junior Swimming Championships-Dubai==== De Silva participated in 2 events 50m Freestyle clocking 24.32 and 100 Butterfly clocking 57.79. ====
2014 FINA World Swimming Championships (25 m)-Doha==== De Silva subsequently competed in the
2014 FINA World Swimming Championships held in
Doha,
Qatar, where he swam in the heats of the Open 50m butterfly, Open 100m butterfly, Open 50m freestyle and Open 100m freestyle. ====
2015 16th FINA World Championships-Kazan==== De Silva participated in the 2 men 2 women mixed relay team. ====
2017 17th FINA World Championships-Budapest==== Having been able to compete in the 50m Butterfly as well as the 100m Butterfly event he was able to secure a world ranking of 49 and 55 with a time of 25.15 and 55.09 respectively. ====
2018 14th FINA World Swimming Championships (25 m)- Hangzhou==== "Of the two men and two women swim team, Cherantha De Silva, Thimali Bandara and Savindi Jayaweera took the pool on the opening two days of the championship but had to hit the hay when they failed to advance to the semifinals amidst fierce competition." ====
2021 FINA World Swimming Championships (25 m) - Yas Island, Abu Dhabi, UAE==== De Silva competed in the 100m Butterfly and Freestyle representing Sri Lanka. ===
2014 Commonwealth Games- Glassgow=== De Silva participated at
2014 Commonwealth Games in
Glasgow, competing in the 50m and 100m
freestyle and the 50m and 100m
butterfly but failed to progress past the heats. ===
2016 South Asian Games - Guwahati=== In 2016 De Silva participated at the
South Asian Games in
Guwahati, India where he won one gold, four silver and two bronze medals.
2017 7th National Short Course Swimming Championship- Singapore In December 2017, De Silva was able to set history for Sri Lanka by breaking a foreign national record. De Silva was able to shatter Singapore Olympian Quah Wen Zeng's 50-m butterfly record, thus renewing it to 23.48 seconds. (He broke the Singapore national record and Sri Lankan national record, as well as set a new meet record in this race.) The specialty of De Silva's performance was that he was able to break 11 records across 10 events(heats and finals) in just two days. (record summary: Combination of heats, finals, and a meet record.) ===
2018 Commonwealth Games- GoldCoast=== In February 2018, de Silva was named to Sri Lanka's
2018 Commonwealth Games team. This was his 2nd representation of the Commonwealth Games edition. Cherantha was part of 4 × 100 m freestyle relay team that made history for Sri Lanka by advancing in to the finals. "The 4-man swim team representation in the Gold Coast, powered their way through to the final of the Men's Freestyle event earlier this morning." However, the team had met with an unexpected incident of disqualification which resulted in a great upset by the 4-man team. ===
2018 Asian Games=== Following the success of the 2018 Commonwealth Games, De Silva was selected for the 2018 Asian Games which was held in August. ==Scholarships==