Rescue crews say the fact they were wearing life jackets probably saved their lives.
Bundoran RNLI launched to the overturned jet-ski after a distress call to Malin Head Coast Guard.
The crew raced to Murvagh Beach amid reports that four people were in the water.
“In overcast conditions, the lifeboat William Henry Liddington launched within six minutes of the initial request and made their way across Donegal Bay to the scene on the Rossnowlagh side of Murvagh,” said Shane Smyth from Bundoran RNLI.
“The Sligo based Rescue 118 helicopter also launched to the scene.
“Upon arrival, the RNLI crew found that the family of four from the North had made their way safely to shore. A member of the crew went ashore to ensure that the family were ok.”
Bundoran RNLI Helm Brian Gillespie said: ‘Thankfully the family were wearing lifejackets, otherwise this could have been a much more serious situation.
“We would remind sea and water users to always wear a lifejacket when heading for the water and as always if a member of the public sees someone in danger on the water to call 999 or 112 and ask for the Coast Guard.”