At the age of 21, Tim Lake (Domhnall Gleeson) discovers he can travel in time... The night after another unsatisfactory New Year party, Tim's father (Bill Nighy) tells his son that the men in his family have always had the ability to travel through time. Tim can't change history, but he can change what happens and has happened in his own life-so he decides to make his world a better place...by getting a girlfriend. Sadly, that turns out not to be as easy as you might think. Moving from the Cornwall coast to London to train as a lawyer, Tim finally meets the beautiful but insecure Mary (Rachel McAdams). They fall in love, then an unfortunate time-travel incident means he's never met her at all. So they meet for the first time again-and again-but finally, after a lot of cunning time-traveling, he wins her heart. Tim then uses his power to create the perfect romantic proposal, to save his wedding from the worst best-man speeches, to save his best friend from professional disaster and to ...
| Domhnall Gleeson | Tim |
| Rachel McAdams | Mary |
| Bill Nighy | Dad |
| Lydia Wilson | Kit Kat |
| Lindsay Duncan | Mum |
| Richard Cordery | Uncle D |
| Joshua McGuire | Rory |
| Tom Hollander | Harry |
| Margot Robbie | Charlotte |
| Will Merrick | Jay |
| Vanessa Kirby | Joanna |
| Tom Hughes | Jimmy Kincade |
| Clemmie Dugdale | Ginger Jenny |
| Harry Hadden-Paton | Rupert |
| Lisa Eichhorn | Mary's Mother, Jean |
| Nick Laird-Clowes | Composer |
| Mitchell Mullen | Mary's Father, Fitz |
| Jenny Rainsford | Polly |
| Natasha Powell | Aunty May |
| Mark Healy | Dans Le Noir Maitre D' |
| Ben Benson | Theatre Deserter |
| Philip Voss | Theatre Judge |
| Tom Godwin | Prompter |
| Pal Aron | Bhattie QC |
| Catherine Steadman | Tina |
| Andrew Martin Yates | Wedding Priest |
| Charlie Barnes | Posy (Newborn) |
| Verity Fullerton | Posy (Newborn) |
| Veronica Owings | Posy (1 year) |
| Olivia Konten-Sloman | Posy (2 1 / 2 - 3 years) |
| Olivia Konten | Posy (2 1 |
| Sara Heller | Posy (5 years) |
| Sarah Heller | Posy (5 years) |
| Jaiden Dervish | Boy Posy |
| Jacob Francis | Jeff (Newborn) |
| Jago Freud | Jeff (5 months) |
| Ollie Phillips | Jeff (2 years) |
| Sophie Pond | Jo (6 months) |
| Sophie Brown | Jo (1 year) |
| Molly Seymour | Trudy (Party Guest) |
| Matilda Sturridge | Flirty Girl |
| Tom Stourton | John |
| Rebecca Chew | Pret A Manager Server |
| Jon West | Court Clerk |
| Graham Richard Howgego | Judge |
| Kerrie Liane Studholme | Jury Foreman |
| Kenneth Hazeldine | Defendant |
| Barbar Gough | Jazz Singer |
| Jon Boden | Busker |
| Charlie Curtis | Young Tim |
| Haruka Abe | Japanese Girl |
| Abdillahi Abubakar | American (uncredited) |
| John Guleserian | Cinematographer |
| Fiaz Ali | Hospital Visitor (uncredited) |
| Mark Day | Editor |
| Bhanu Alley | Passerby (uncredited) |
| John Paul Kelly | Production Designer |
| Cleo Bianca Anderson | Glam Woman at the Old Vic (uncredited) |
| Liz Griffiths | Set Decorator |
| Habib Anibaba | Builder (uncredited) |
| Verity Hawkes | Custome Designer |
| Lee Asquith-Coe | Bin Man (uncredited) |
| Christine Blundell | hair stylist / makeup artist |
| Richard Banks | Builder (uncredited) |
| Charmaine Fuller | Makeup Artist |
| Francesca Bennett | Mary's Aunt |
| Greg Bennett | Police Constable (uncredited) |
| Alexandra Joyce | junior hair stylist: dailies / junior makeup artist: dailies |
| Katharine Blackshaw | Solicitor in Chambers (uncredited) |
| Monica MacDonald | Makeup Artist |
| Alon Bentley | Hospital Visitor |
| Paul Blackwell | Commuter (uncredited) |
| Stephanie Lynne Smith | additional makeup and hair artist |
| Joe Barlow | crowd second assistant director |
| Matt Butcher | Courtroom Observer (uncredited) |
| Josey McNamara | crowd second assistant director: prep |
| Siong Loong Choong | Tourist (uncredited) |
| Matthew Penry-Davey | first assistant director |
| Murray Close | Wedding Photographer (uncredited) |
| Ben Quirk | crowd third assistant director |
| Leon Corbin | Passenger (uncredited) |
| Bern Collaco | Doctor |
| Charlie Reed | key second assistant director |
| Tom Coulston | Theatre attendee (uncredited) |
| Lee Sheward | second unit director |
| Graham Curry | Commuter (uncredited) |
| Eva Dagoo | Golden Woman (uncredited) |
| Yasmin Alvarez | prop maker |
| Catherine Delaloye | French School Teacher (uncredited) |
| Sarah Ascroft-Leigh | petty cash buyer |
| Katherine Denkinson | Public Family (uncredited) |
| Antonia Atha | assistant art director |
| Rowena Diamond | Party Guest (uncredited) |
| Beverley Butcher | production buyer |
| Kriss Dillon | Art Gallery Attendant (uncredited) |
| Christopher Chandler | chargehand standby props |
| John Duggan | Clerk of Court (uncredited) |
| Lynne Divers | petty cash buyer |
| Nichola Fynn | Deputy Head Teacher (uncredited) |
| Dino Fazzani | Driver Abby Road (uncredited) |
