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 |
| Mitchell Mullen | Mary's Father, Fitz |
| Nick Laird-Clowes | Composer |
| 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 |
| Verity Fullerton | Posy (Newborn) |
| Charlie Barnes | Posy (Newborn) |
| Veronica Owings | Posy (1 year) |
| Olivia Konten-Sloman | Posy (2 1 / 2 - 3 years) |
| Sara Heller | Posy (5 years) |
| Olivia Konten | Posy (2 1 |
| Jaiden Dervish | Boy Posy |
| Sarah Heller | Posy (5 years) |
| 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 |
| Verity Hawkes | Custome Designer |
| Habib Anibaba | Builder (uncredited) |
| Lee Asquith-Coe | Bin Man (uncredited) |
| Christine Blundell | hair stylist / makeup artist |
| Richard Banks | Builder (uncredited) |
| Francesca Bennett | Mary's Aunt |
| Charmaine Fuller | Makeup Artist |
| Alexandra Joyce | junior hair stylist: dailies / junior makeup artist: dailies |
| Greg Bennett | Police Constable (uncredited) |
| Alon Bentley | Hospital Visitor |
| Katharine Blackshaw | Solicitor in Chambers (uncredited) |
| Monica MacDonald | Makeup Artist |
| Stephanie Lynne Smith | additional makeup and hair artist |
| Paul Blackwell | Commuter (uncredited) |
| 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) |
| Leon Corbin | Passenger (uncredited) |
| Ben Quirk | crowd third assistant director |
| Charlie Reed | key second assistant director |
| Bern Collaco | Doctor |
| Tom Coulston | Theatre attendee (uncredited) |
| Graham Curry | Commuter (uncredited) |
| Lee Sheward | second unit director |
| Yasmin Alvarez | prop maker |
| Eva Dagoo | Golden Woman (uncredited) |
| Catherine Delaloye | French School Teacher (uncredited) |
| Sarah Ascroft-Leigh | petty cash buyer |
| Antonia Atha | assistant art director |
| Katherine Denkinson | Public Family (uncredited) |
| Beverley Butcher | production buyer |
| Rowena Diamond | Party Guest (uncredited) |
| Christopher Chandler | chargehand standby props |
| Kriss Dillon | Art Gallery Attendant (uncredited) |
| John Duggan | Clerk of Court (uncredited) |
| Lynne Divers | petty cash buyer |
| Dino Fazzani | Driver Abby Road (uncredited) |
| Nichola Fynn | Deputy Head Teacher (uncredited) |
