Emily Blunt as Rosemary

Jamie Dornan as Anthony

Jon Hamm as Adam

Christopher Walken as Tony Reilly

Dearbhla Molloy as Aoife Muldoon

Danielle Ryan as Maeve

Barry McGovern as Cleary

Don Wycherley as Chris Muldoon

Clare Barrett as Mary Reilly

Darragh O'Kane as Young Anthony

Abigail Coburn as Young Rosemary

Anna Weekes as Fiona

Lydia McGuinness as Eleanor

Tony Reidy as Pub Band

Des Cafferty as Pub Band

Dan Delany as Pub Band

Michael McCormack as Owen The Townsman

Jon Tenney as Pub MC

Tommy O'Neill as Uncle Frank

Rosemary Muldoon as Woman at Picnic

Paige Bestington as Ballerina

Martin F. Ward as Self - Flight Attendant (uncredited)

Joseph Palmer as First Class Passenger