 | Haley Lu Richardson als Hadley Sullivan |
 | Ben Hardy als Oliver Jones |
 | Rob Delaney als Andrew Sullivan |
 | Katrina Nare als Charlotte |
 | Jameela Jamil als Narrator (voice) |
 | Tom Taylor als Luther Jones |
 | Dexter Fletcher als Val Jones |
 | Sally Phillips als Tess Jones |
 | Vivian Gwaspari als Headphones Girl |
| Jordan Frazier als Gate Agent Jenny |
 | Tracy Wiles als Mrs. O'Callaghan |
| Philip Bird als Mr. O'Callaghan |
 | Ibinabo Jack als Bridesmaid Shanti |
 | Jessica Ransom als Bridesmaid Bertie |
 | Doña Croll als Hat Lady Elizabeth |
| Leigh Quinn als Bridesmaid Jasmine |
| Stephan Boyce als Monty |
 | Kerry Howard als Maid of Honour Violet |
 | Anthony Warren als Heathrow Taxi Driver |
 | Andromeda Godfrey als Cate Sullivan |
| Buddy Powell als Kid Oliver |
| Jasper Hawes als Kid Luther |
 | David Rubin als Dr. Doyle |
| Sunil Patel als Chain Mail Guest |
| Sam Booth als Reverend |
| George Keeler als Flower Vendor |
 | Emily Cordell als Teen Girl |
 | David Langham als UK Border Officer |
 | Angus Kennedy als Thicker |
 | Jayda Eyles als Young Hadley |
| Paul Lacoux als Earnest Man |
| Ione Brown als Female Friend |
| Jennifer E. Smith | Novel |
| Vanessa Caswill | Director |
| Katie Lovejoy | Screenplay |
| Haley Lu Richardson | Executive Producer |
| Matt Kaplan | Producer |
| Max Siemers | Executive Producer |
| Matthew Janzen | Executive Producer |
| Jennifer E. Smith | Executive Producer |
| Chris Foss | Executive Producer |
| Mark Lane | Executive Producer |
| Aubrey Bendix | Co-Producer |
| Paul Saunderson | Original Music Composer |
| Luke Bryant | Director of Photography |
| Michelle Harrison | Editor |
| Joe Klotz | Editor |
| Colin Jones | Casting |
| Francesca Massariol | Production Design |
| Philip A. Brown | Art Direction |
| Fiona Albrow | Set Decoration |
| Kirsty Halliday | Costume Design |
| Alice Caronna | First Assistant Director |
| Noel Corbally | Second Assistant Director |
| Luke Goodrich | First Assistant Director |
| Liam Saint-Pierre | Second Unit Director |
| Mick Ward | First Assistant Director |
| Russell Jeffery | Sound Mixer |
| Alex Outhwaite | Sound Effects Editor |
| Ed Trousseau | Supervising Sound Editor |
| Ed Trousseau | Sound Re-Recording Mixer |
| Eddy Popplewell | Special Effects Technician |
| Menelaos Pampoukidis | Visual Effects Supervisor |
| Dasha Sherman | Visual Effects Producer |
| Stephen Mullen | Gaffer |
| Onx Narang | Gaffer |
| Neil Valdez | Camera Operator |
| Marta Noguera | Casting Associate |
| Colin Jones | Casting Director |
| Arron Cuthbertson | Extras Casting |
| Carla Bartley | Extras Casting |
| Stuart Truesdale | Costume Supervisor |
| Lisa Pemberton | Makeup Department Head |
