The show "Married at First Sight" (MAFS) has different versions with varying schedules. For the UK version in 2025, episodes air from Sunday to Wednesday at 9pm on E4, with the show expected to end in mid-November. Recent episodes were scheduled as late as October 22, indicating the show is currently ongoing with episodes typically starting at 9pm, except on some Wednesdays when the time is 8pm.

The US version, "Married at First Sight" Season 19, premieres on Thursday, October 23, 2025, exclusively on Peacock, with a four-episode launch and new episodes released every Thursday, continuing through mid-November with a reunion special on November 20.

In summary:

• MAFS UK 2025 airs Sunday to Wednesday evenings around 9pm on E4.
• MAFS US Season 19 starts on October 23, 2025, on Peacock, with episodes released weekly on Thursdays.

This covers the current "when is MAFS on" for both major versions in 2025.