Sanditon season 3: release date, cast, plot, trailer and everything we know

Sanditon season 3' Charlotte Heywood and Ralph Starling looking lovingly at each other on a beach,
Charlotte is with Ralph in Sanditon season 3, but will it last? (Image credit: Red Planet Pictures / Joss Barratt)

Sanditon season 3 is the final series, sadly for fans. However, judging by the fabulous pictures and plot teases there's plenty to look forward to as Charlotte Heywood (Rose Williams) finally tries to secure love. We even now have a lavish trailer to enjoy.

Based on the unfinished novel by Jane Austen, Sanditon has become a huge hit, as poor Charlotte falls in and out of love.

At the end of the second series, she'd shockingly agreed to marry farmer Ralph Starling (Cai Brigden), only shortly after having her romantic dreams with the brooding Alexander Colbourne (Ben Lloyd-Hughes) dashed.

Talking about the new series, Executive Producer for Red Planet Pictures Belinda Campbell says, "It’s a thrill to be bringing Sanditon back to audiences for one more trip to the seaside. This third and final season is full of the heart and joyful spirit that viewers will connect with. Our dedicated fans have been absolutely amazing in their support of the show, and we hope they’ll enjoy the conclusion of Charlotte and Georgiana's stories.”

Here's everything we know...

Sanditon season 3 release date

The acclaimed drama that has transported audiences to the sunny seaside of Regency England will premiere on Masterpiece on Sunday, March 19, 2023, at 9/8c on PBS. The series will also be available to stream on, PBS Passport, and the MASTERPIECE PBS Prime Video Channel. The series will air in the UK on ITV1, although a release date is still to be announced.

What's the plot?

Alexander Colbourne (Ben Lloyd-Hughes).

Alexander Colbourne is back... and still moody! (Image credit: Red Planet Pictures/Rob Youungson)

Well, as mentioned Charlotte has agreed to marry Ralph, although we're not convinced Ralph is the love of her life. After having a troublesome time with Alexander Colbourne, who led her on a merry dance in series two, Charlotte appears to have settled for Ralph. The main picture does show them looking close at a beach, but we don’t think Charlotte will end up with Ralph. Colbourne is still on the scene and perhaps the pair will resolve their difficulties and find love.

Meanwhile, the new arrivals set to shake up the coastal resort include Lady Montrose (Emma Fielding, Van der Valk), the quintessential Austen mother who arrives in Sanditon with one objective: matches for her children, Lydia and Henry. Lydia (Alice Orr-Ewing, A Very English Scandal) is an independent young woman who is not as eager for a match as her mother, and Lord Henry Montrose (Edward Davis, Emma) is charismatic and confident, but he holds a secret. 

Rowleigh Pryce (James Bolam, New Tricks) is a wealthy, curmudgeonly investor who is interested in teaming up with Tom Parker on the seaside resort’s expansion. Their plans become complicated when Rowleigh runs into the formidable Lady Denham. 

Sanditon season 3 cast

Rose Williams is back as our heroine Charlotte. While former Death in Paradise star Kris Marshall is back as Tom Parker, alongside Anne Reid as Lady Denham. Crystal Clarke returns as Georgina. Liam Garrigan (Small Axe) joins as Alexander’s brother, Samuel Colbourne — a lawyer, and a charming bachelor.

Plus, as mentioned New Tricks star James Bolam turns up as a wealthy investor, Emma Fielding plays Lady Montrose and Alice Orr-Ewing and Edward Davis star as her children.

Is there a trailer?

Yes, it opens with Charlotte saying: "Too often, young women are thought to be strangers to their own minds. It is left to fathers or uncles to choose the path their lives should take as if we require saving from ourselves." Alexander Colbourne says: "If you've taught me anything Miss Heywood, is that a young woman has a right to choose her own destiny." The trailer sees Charlotte clearly torn between whether to take the safe option by wedding Ralph or risk falling for Colbourne all over again...

David Hollingsworth

David is the What To Watch Editor and has over 20 years of experience in television journalism. He is currently writing about the latest television and film news for What To Watch.

Before working for What To Watch, David spent many years on TV Times magazine, interviewing some of television's most famous stars including Hollywood actor Kiefer Sutherland, singer Lionel Richie and wildlife legend Sir David Attenborough. 

David started out as a writer on TV Times before becoming the title's deputy features editor and then features editor. During his time on TV Times, David also helped run the annual TV Times Awards. David is a huge Death in Paradise fan, although he's still failed to solve a case before the show's detective! He also loves James Bond and controversially thinks that Timothy Dalton was an excellent 007.

Other than watching and writing about telly, David loves playing cricket, going to the cinema, trying to improve his tennis and chasing about after his kids!