"The big thing will be seeing friends and family and the people who they were expecting to spend Christmas with," said Helen Sharman, Britain's first astronaut.
"All of those family celebrations, the birthdays and the other events that they thought they were going to be part of - now, suddenly they can perhaps catch up on a bit of lost time."
The saga of Butch and Suni began in June 2024.
They were taking part in the first crewed test flight of the Starliner spacecraft, developed by aerospace company Boeing.
But the capsule suffered several technical problems during its journey to the space station, and it was deemed too risky to take the astronauts home.
Starliner returned safely to Earth empty in early September, but it meant the pair needed a new ride for their return.
So Nasa opted for the next scheduled flight: a SpaceX capsule that arrived at the ISS in late September.
It flew with two astronauts instead of four, leaving two seats spare for Butch and Suni's return.
The only catch was this had a planned six-month mission, extending the astronauts stay until now.
The Nasa pair embraced their longer-than-expected stay in space.