| Malmsten Swim Open Stockholm 2021 | Stockholm | Swedish Swimming Federation | 2021-04-08 | 50 M |  |
| Zimmari-Cup 2 | Kempele | Kempeleenn Pyrintöry | 2021-04-10 | 25 M | |
| TimeTrial2021 | Lahti | Lahden Uimaseura | 2021-04-10 | 25 M | |
| Time trial Lohet & OU 10-11.4 | Oulu | Lohet & OU | 2021-04-10 | 50 M | |
| Kvarken Games | Vaasa | Vaasan Uimaseura - Vasa Simförening ry/rf | 2021-04-10 | 50 M | |
| KuUS Seurakisa 10.-11.4.2021 | Kuopio | Kuopion Uimaseura | 2021-04-10 | 50 M | |
| Kausikisat 3 | Seinäjoki | Seinäjoen Uimarit | 2021-04-11 | 25 M | |
| Hauki-cup 2 | Oulu | Haukiputaan Heitto | 2021-04-11 | 25 M | |
| Ouneva-Group uinnit | Joensuu | Jous | 2021-04-17 | 25 M | |
| Månadstävling april 2021 | Mariehamn | Ålands Simförening | 2021-04-17 | 25 M | |
| Kainuun alueuinnit 2021-04-17 | Kaqjaqani | Kajaanin Uimaseura | 2021-04-17 | 50 M | |
| SCR CUP II 2021 | Rovaniemi | SCR | 2021-04-17 | 25 M | |
| Cetus time trial 1 | Espoo | Cetus Espoo | 2021-04-18 | 50 M | |
| Cetus time trial 2 | Espoo | Cetus Espoo | 2021-04-22 | 50 M | |
| Helsinki Swim Meet 2021 | Helsinki | Suomen Uimaliitto | 2021-04-22 | 50 M | |
| Cetus time trial 3 | Espoo | Cetus Espoo | 2021-04-23 | 50 M | |
| RausCup24042021 | | Rauman uimaseura | 2021-04-24 | 25 M | |
| Pitkän matkan kisa | Seinäjoki | Seinäjoen Uimarit-58 | 2021-04-24 | 25 M | |
| Cetus time trial 4 | Espoo | Cetus Espoo | 2021-04-24 | 50 M | |
| Jyväskylä Time Trial II | Jyväskylä | Swimming Jyväskylä | 2021-04-24 | 50 M | |
