Suatu ketika dahulu (Siri TV)

Bahasa	Inggeris
Penggubah	Mark Isham
Negara asal	Amerika Syarikat
Syarikat pengedaran	Disney–ABC Domestic Television
Penerbit eksekutif	Edward Kitsis Adam Horowitz Steve Pearlman David H. Goodman Andrew Chambliss
Penerbit	Damon Lindelof Christine Boylan Robert Hull Kalinda Vazquez Jane Espenson Daniel T. Thomsen Brian Wankum Kathy Gilroy Ian Goldberg Liz Tigelaar Samantha Thomas Jerome Schwartz
Format gambar	720p (16:9 HDTV)
Format audio	Dolby Digital 5.1
Syarikat penerbitan	ABC Studios Kitsis/Horowitz
Lokasi	Steveston, British Columbia [1] Vancouver, British Columbia
Tempoh siaran	43 minit
Pencipta	Edward Kitsis Adam Horowitz
Siaran asal	Oktober 23, 2011 (2011-10-23) – 18 Mei 2018 (2018-05-18)
Sinematografi	Steven Fierberg Stephen Jackson
Bilangan episod	155 (Senarai episod)
Penyunting	Geofrey Hildrew Mark Goldman Scot J. Kelly Joe Talbot Hall
Rancangan berkaitan	Once Upon a Time in Wonderland
Dibintangi oleh	Ginnifer Goodwin Jennifer Morrison Lana Parrilla Josh Dallas Jared S. Gilmore Raphael Sbarge Jamie Dornan Robert Carlyle Eion Bailey Emilie de Ravin Meghan Ory Colin O'Donoghue Michael Raymond-James Michael Socha Rebecca Mader Sean Maguire
Genre	Fantasi Drama Kembara Misteri
Bilangan musim	7
Saluran asal	ABC